WebSVN – Kolibri OS – Diff – /drivers/video/drm/i915/intel_panel.c

  *      Chris Wilson
  */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include
 #include
+#include
+#include "intel_drv.h"
 #include
-#include "intel_drv.h"
+#define CRC_PMIC_PWM_PERIOD_NS	21333
 void
 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
+}
 /* adjusted_mode has been preset to be the panel's fixed mode */
 void
 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
-			struct intel_crtc_config *pipe_config,
+			struct intel_crtc_state *pipe_config,
 			int fitting_mode)
-{
-	struct drm_display_mode *adjusted_mode;
-	int x, y, width, height;
+{
-	adjusted_mode = &pipe_config->adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
-	x = y = width = height = 0;
+	int x = 0, y = 0, width = 0, height = 0;
 	/* Native modes don't need fitting */
-	if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
+	if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
-	    adjusted_mode->vdisplay == pipe_config->pipe_src_h)
+	    adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 		goto done;
 	switch (fitting_mode) {
 	case DRM_MODE_SCALE_CENTER:
 		width = pipe_config->pipe_src_w;
 		height = pipe_config->pipe_src_h;
-		x = (adjusted_mode->hdisplay - width + 1)/2;
+		x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
-		y = (adjusted_mode->vdisplay - height + 1)/2;
+		y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 		break;
 	case DRM_MODE_SCALE_ASPECT:
 		/* Scale but preserve the aspect ratio */
 		{
-			u32 scaled_width = adjusted_mode->hdisplay
+			u32 scaled_width = adjusted_mode->crtc_hdisplay
 				* pipe_config->pipe_src_h;
 			u32 scaled_height = pipe_config->pipe_src_w
-				* adjusted_mode->vdisplay;
+				* adjusted_mode->crtc_vdisplay;
 			if (scaled_width > scaled_height) { /* pillar */
 				width = scaled_height / pipe_config->pipe_src_h;
 				if (width & 1)
-				    	width++;
+					width++;
-				x = (adjusted_mode->hdisplay - width + 1) / 2;
+				x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 				y = 0;
-				height = adjusted_mode->vdisplay;
+				height = adjusted_mode->crtc_vdisplay;
 			} else if (scaled_width < scaled_height) { /* letter */
 				height = scaled_width / pipe_config->pipe_src_w;
 				if (height & 1)
 				    height++;
-				y = (adjusted_mode->vdisplay - height + 1) / 2;
+				y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 				x = 0;
-				width = adjusted_mode->hdisplay;
+				width = adjusted_mode->crtc_hdisplay;
 			} else {
 				x = y = 0;
-				width = adjusted_mode->hdisplay;
+				width = adjusted_mode->crtc_hdisplay;
-				height = adjusted_mode->vdisplay;
+				height = adjusted_mode->crtc_vdisplay;
+			}
 		}
 		break;
 	case DRM_MODE_SCALE_FULLSCREEN:
 		x = y = 0;
-		width = adjusted_mode->hdisplay;
+		width = adjusted_mode->crtc_hdisplay;
 	pipe_config->pch_pfit.size = (width << 16) | height;
 	pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
+}
 static void
-centre_horizontally(struct drm_display_mode *mode,
+centre_horizontally(struct drm_display_mode *adjusted_mode,
 		    int width)
+{
 	u32 border, sync_pos, blank_width, sync_width;
 	/* keep the hsync and hblank widths constant */
-	sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
+	sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
-	blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
+	blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 	sync_pos = (blank_width - sync_width + 1) / 2;
-	border = (mode->hdisplay - width + 1) / 2;
+	border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 	border += border & 1; /* make the border even */
-	mode->crtc_hdisplay = width;
+	adjusted_mode->crtc_hdisplay = width;
-	mode->crtc_hblank_start = width + border;
+	adjusted_mode->crtc_hblank_start = width + border;
-	mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
+	adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
-	mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
+	adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
-	mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
+	adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
+}
 static void
-centre_vertically(struct drm_display_mode *mode,
+centre_vertically(struct drm_display_mode *adjusted_mode,
 		  int height)
 {
 	u32 border, sync_pos, blank_width, sync_width;
 	/* keep the vsync and vblank widths constant */
-	sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
+	sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
-	blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
+	blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 	sync_pos = (blank_width - sync_width + 1) / 2;
-	border = (mode->vdisplay - height + 1) / 2;
+	border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 #define FACTOR (1 << ACCURACY)
 	u32 ratio = source * FACTOR / target;
 	return (FACTOR * ratio + FACTOR/2) / FACTOR;
+}
-static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
+static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 			      u32 *pfit_control)
 {
-	struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
-			u32 scaled_width = adjusted_mode->hdisplay *
+	u32 scaled_width = adjusted_mode->crtc_hdisplay *
 		pipe_config->pipe_src_h;
 	u32 scaled_height = pipe_config->pipe_src_w *
-				adjusted_mode->vdisplay;
+		adjusted_mode->crtc_vdisplay;
-			/* 965+ is easy, it does everything in hw */
+	/* 965+ is easy, it does everything in hw */
-			if (scaled_width > scaled_height)
+	if (scaled_width > scaled_height)
 		*pfit_control |= PFIT_ENABLE |
-					PFIT_SCALING_PILLAR;
+			PFIT_SCALING_PILLAR;
-			else if (scaled_width < scaled_height)
+	else if (scaled_width < scaled_height)
 		*pfit_control |= PFIT_ENABLE |
-					PFIT_SCALING_LETTER;
+			PFIT_SCALING_LETTER;
-	else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
+	else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 		*pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
+}
-static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
+static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 			      u32 *pfit_control, u32 *pfit_pgm_ratios,
 			      u32 *border)
+{
-	struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
+	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
-			u32 scaled_width = adjusted_mode->hdisplay *
+	u32 scaled_width = adjusted_mode->crtc_hdisplay *
 		pipe_config->pipe_src_h;
 	u32 scaled_height = pipe_config->pipe_src_w *
-				adjusted_mode->vdisplay;
+		adjusted_mode->crtc_vdisplay;
 	u32 bits;
-				centre_horizontally(adjusted_mode,
+		centre_horizontally(adjusted_mode,
-						    scaled_height /
+				    scaled_height /
 				    pipe_config->pipe_src_h);
 		*border = LVDS_BORDER_ENABLE;
-		if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
+		if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 			bits = panel_fitter_scaling(pipe_config->pipe_src_h,
-						    adjusted_mode->vdisplay);
+						    adjusted_mode->crtc_vdisplay);
 			*pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
-							    bits << PFIT_VERT_SCALE_SHIFT);
+					     bits << PFIT_VERT_SCALE_SHIFT);
-				centre_vertically(adjusted_mode,
+		centre_vertically(adjusted_mode,
-						  scaled_width /
+				  scaled_width /
 				  pipe_config->pipe_src_w);
 		*border = LVDS_BORDER_ENABLE;
-		if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
+		if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 			bits = panel_fitter_scaling(pipe_config->pipe_src_w,
-						    adjusted_mode->hdisplay);
+						    adjusted_mode->crtc_hdisplay);
 			*pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
-							    bits << PFIT_VERT_SCALE_SHIFT);
+					     bits << PFIT_VERT_SCALE_SHIFT);
-						 HORIZ_INTERP_BILINEAR);
+				  HORIZ_INTERP_BILINEAR);
+	}
+}
 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
-			      struct intel_crtc_config *pipe_config,
+			      struct intel_crtc_state *pipe_config,
 			      int fitting_mode)
+{
 	struct drm_device *dev = intel_crtc->base.dev;
-	u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
-	struct drm_display_mode *adjusted_mode;
+	u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
-	adjusted_mode = &pipe_config->adjusted_mode;
+	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	/* Native modes don't need fitting */
-	if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
+	if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
-	    adjusted_mode->vdisplay == pipe_config->pipe_src_h)
+	    adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 		goto out;
 	case DRM_MODE_SCALE_FULLSCREEN:
 		/*
 		 * Full scaling, even if it changes the aspect ratio.
 		 * Fortunately this is all done for us in hw.
 		 */
-		if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
+		if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
-		    pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
+		    pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 			pfit_control |= PFIT_ENABLE;
 			if (INTEL_INFO(dev)->gen >= 4)
 				pfit_control |= PFIT_SCALING_AUTO;
 			else
 				pfit_control |= (VERT_AUTO_SCALE |
+{
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	/* Assume that the BIOS does not lie through the OpRegion... */
 	if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
-		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
+		return *dev_priv->opregion.lid_state & 0x1 ?
 			connector_status_connected :
 			connector_status_disconnected;
+	}
+	}
 	return val;
 }
-static u32 bdw_get_backlight(struct intel_connector *connector)
+static u32 lpt_get_backlight(struct intel_connector *connector)
+{
 	struct drm_device *dev = connector->base.dev;
 	enum pipe pipe = intel_get_pipe_from_connector(connector);
 	return _vlv_get_backlight(dev, pipe);
+}
+static u32 bxt_get_backlight(struct intel_connector *connector)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct intel_panel *panel = &connector->panel;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
+}
+static u32 pwm_get_backlight(struct intel_connector *connector)
+{
+	struct intel_panel *panel = &connector->panel;
+	int duty_ns;
+	duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
+	return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
+}
 static u32 intel_panel_get_backlight(struct intel_connector *connector)
+{
 	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_panel *panel = &connector->panel;
 	u32 val = 0;
 	mutex_lock(&dev_priv->backlight_lock);
 	if (panel->backlight.enabled) {
-	val = dev_priv->display.get_backlight(connector);
+		val = panel->backlight.get(connector);
-	val = intel_panel_compute_brightness(connector, val);
+		val = intel_panel_compute_brightness(connector, val);
+	}
 	mutex_unlock(&dev_priv->backlight_lock);
 	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 	return val;
+}
 	tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 	I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
-}
+}
 static void
-intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
+static void bxt_set_backlight(struct intel_connector *connector, u32 level)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
+	I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
+}
+static void pwm_set_backlight(struct intel_connector *connector, u32 level)
+{
+	struct intel_panel *panel = &connector->panel;
+	int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
+	pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
+}
+static void
+intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 	struct drm_device *dev = connector->base.dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
 	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 	level = intel_panel_compute_brightness(connector, level);
-	dev_priv->display.set_backlight(connector, level);
+	panel->backlight.set(connector, level);
 	WARN_ON(panel->backlight.max == 0);
 	hw_level = clamp_user_to_hw(connector, user_level, user_max);
+	panel->backlight.level = hw_level;
-	panel->backlight.level = hw_level;
+	mutex_unlock(&dev_priv->backlight_lock);
+}
+static void lpt_disable_backlight(struct intel_connector *connector)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	u32 tmp;
+	intel_panel_actually_set_backlight(connector, 0);
+	/*
+	 * Although we don't support or enable CPU PWM with LPT/SPT based
+	 * systems, it may have been enabled prior to loading the
+	 * driver. Disable to avoid warnings on LCPLL disable.
+	 *
+	 * This needs rework if we need to add support for CPU PWM on PCH split
+	 * platforms.
+	 */
+	tmp = I915_READ(BLC_PWM_CPU_CTL2);
+	if (tmp & BLM_PWM_ENABLE) {
+		DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
+		I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 	if (panel->backlight.enabled)
 		intel_panel_actually_set_backlight(connector, hw_level);
 	tmp = I915_READ(BLC_PWM_PCH_CTL1);
-	mutex_unlock(&dev_priv->backlight_lock);
+	I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 	tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
+}
+static void bxt_disable_backlight(struct intel_connector *connector)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
+	u32 tmp, val;
+	intel_panel_actually_set_backlight(connector, 0);
+	tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			tmp & ~BXT_BLC_PWM_ENABLE);
+	if (panel->backlight.controller == 1) {
+		val = I915_READ(UTIL_PIN_CTL);
+		val &= ~UTIL_PIN_ENABLE;
+		I915_WRITE(UTIL_PIN_CTL, val);
+	}
+}
+static void pwm_disable_backlight(struct intel_connector *connector)
+{
+	struct intel_panel *panel = &connector->panel;
+	/* Disable the backlight */
+	pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
+	usleep_range(2000, 3000);
+	pwm_disable(panel->backlight.pwm);
+}
 void intel_panel_disable_backlight(struct intel_connector *connector)
+{
 	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_panel *panel = &connector->panel;
 	if (!panel->backlight.present)
 		return;
 	/*
-	 * Do not disable backlight on the vgaswitcheroo path. When switching
+	 * Do not disable backlight on the vga_switcheroo path. When switching
 	 * away from i915, the other client may depend on i915 to handle the
+	}
 	mutex_lock(&dev_priv->backlight_lock);
-	panel->backlight.enabled = false;
+    panel->backlight.enabled = false;
-	dev_priv->display.disable_backlight(connector);
+	panel->backlight.disable(connector);
 	mutex_unlock(&dev_priv->backlight_lock);
+}
-static void bdw_enable_backlight(struct intel_connector *connector)
+static void lpt_enable_backlight(struct intel_connector *connector)
+{
 	I915_WRITE(BLC_PWM_CTL, ctl);
 	POSTING_READ(BLC_PWM_CTL);
 	/* XXX: combine this into above write? */
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	/*
+	 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
+	 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
+	 * that has backlight.
+	 */
+	if (IS_GEN2(dev))
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+		I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
+}
 static void i965_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 	POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
+}
+static void bxt_enable_backlight(struct intel_connector *connector)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
+	enum pipe pipe = intel_get_pipe_from_connector(connector);
+	u32 pwm_ctl, val;
+	/* To use 2nd set of backlight registers, utility pin has to be
+	 * enabled with PWM mode.
+	 * The field should only be changed when the utility pin is disabled
+	 */
+	if (panel->backlight.controller == 1) {
+		val = I915_READ(UTIL_PIN_CTL);
+		if (val & UTIL_PIN_ENABLE) {
+			DRM_DEBUG_KMS("util pin already enabled\n");
+			val &= ~UTIL_PIN_ENABLE;
+			I915_WRITE(UTIL_PIN_CTL, val);
+		}
+		val = 0;
+		if (panel->backlight.util_pin_active_low)
+			val |= UTIL_PIN_POLARITY;
+		I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
+				UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
+	}
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+				pwm_ctl);
+	}
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+			panel->backlight.max);
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+static void pwm_enable_backlight(struct intel_connector *connector)
+{
+	struct intel_panel *panel = &connector->panel;
+	pwm_enable(panel->backlight.pwm);
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+}
 void intel_panel_enable_backlight(struct intel_connector *connector)
+{
 	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	mutex_lock(&dev_priv->backlight_lock);
-	WARN_ON(panel->backlight.max == 0);
-	if (panel->backlight.level == 0) {
-		panel->backlight.level = panel->backlight.max;
 	WARN_ON(panel->backlight.max == 0);
-	dev_priv->display.enable_backlight(connector);
+	panel->backlight.enable(connector);
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 	DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 		      bd->props.brightness, bd->props.max_brightness);
 	intel_panel_set_backlight(connector, bd->props.brightness,
 				  bd->props.max_brightness);
+	/*
+	 * Allow flipping bl_power as a sub-state of enabled. Sadly the
+	 * backlight class device does not make it easy to to differentiate
+	 * between callbacks for brightness and bl_power, so our backlight_power
+	 * callback needs to take this into account.
+	 */
+	if (panel->backlight.enabled) {
+		if (panel->backlight.power) {
+			bool enable = bd->props.power == FB_BLANK_UNBLANK &&
+				bd->props.brightness != 0;
+			panel->backlight.power(connector, enable);
+		}
+	} else {
+		bd->props.power = FB_BLANK_POWERDOWN;
+	}
 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
 	return 0;
+}
+{
+}
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+/*
+ * SPT: This value represents the period of the PWM stream in clock periods
+ * multiplied by 16 (default increment) or 128 (alternate increment selected in
+ * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
+ */
+static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	u32 mul, clock;
+	if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
+		mul = 128;
+	else
+		mul = 16;
+	clock = MHz(24);
+	return clock / (pwm_freq_hz * mul);
+}
+/*
+ * LPT: This value represents the period of the PWM stream in clock periods
+ * multiplied by 128 (default increment) or 16 (alternate increment, selected in
+ * LPT SOUTH_CHICKEN2 register bit 5).
+ */
+static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	u32 mul, clock;
+	if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
+		mul = 16;
+	else
+		mul = 128;
+	if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE)
+		clock = MHz(135); /* LPT:H */
+	else
+		clock = MHz(24); /* LPT:LP */
+	return clock / (pwm_freq_hz * mul);
+}
+/*
-/*
+ * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
+ * display raw clocks multiplied by 128.
+ */
+static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_device *dev = connector->base.dev;
+	int clock = MHz(intel_pch_rawclk(dev));
+	return clock / (pwm_freq_hz * 128);
+}
+/*
+ * Gen2: This field determines the number of time base events (display core
+ * clock frequency/32) in total for a complete cycle of modulated backlight
- * Note: The setup hooks can't assume pipe is set!
+ * control.
+ *
+ * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
+ * divided by 32.
+ */
+static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int clock;
+	if (IS_PINEVIEW(dev))
+		clock = intel_hrawclk(dev);
+	else
+		clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
+	return clock / (pwm_freq_hz * 32);
+}
+/*
+ * Gen4: This value represents the period of the PWM stream in display core
+ * clocks multiplied by 128.
+ */
+static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
+	return clock / (pwm_freq_hz * 128);
+}
- *
+/*
+ * VLV: This value represents the period of the PWM stream in display core
+ * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
+ * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
+ */
+static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int clock;
+	if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
+		if (IS_CHERRYVIEW(dev))
+			return KHz(19200) / (pwm_freq_hz * 16);
+		else
+			return MHz(25) / (pwm_freq_hz * 16);
+	} else {
+		clock = intel_hrawclk(dev);
+		return MHz(clock) / (pwm_freq_hz * 128);
+	}
+}
+static u32 get_backlight_max_vbt(struct intel_connector *connector)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
+	u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
+	u32 pwm;
+	if (!pwm_freq_hz) {
+		DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
+		return 0;
+	}
+	if (!panel->backlight.hz_to_pwm) {
+		DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
+		return 0;
+	}
+	pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
+	if (!pwm) {
+		DRM_DEBUG_KMS("backlight frequency conversion failed\n");
+		return 0;
+	}
+	DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz);
+	return pwm;
+}
- * XXX: Query mode clock or hardware clock and program PWM modulation frequency
+/*
- * appropriately when it's 0. Use VBT and/or sane defaults.
+ * Note: The setup hooks can't assume pipe is set!
  */
 static u32 get_backlight_min_vbt(struct intel_connector *connector)
+{
 	struct drm_device *dev = connector->base.dev;
 	/* vbt value is a coefficient in range [0..255] */
 	return scale(min, 0, 255, 0, panel->backlight.max);
 }
-static int bdw_setup_backlight(struct intel_connector *connector, enum pipe unused)
+static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
 	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 	panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
 	pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
+	panel->backlight.max = pch_ctl2 >> 16;
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
 	panel->backlight.max = pch_ctl2 >> 16;
 	if (!panel->backlight.max)
 		return -ENODEV;
 	panel->backlight.min = get_backlight_min_vbt(connector);
-	val = bdw_get_backlight(connector);
+	val = lpt_get_backlight(connector);
 	pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 	panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
 	pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
+	panel->backlight.max = pch_ctl2 >> 16;
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
 	panel->backlight.max = pch_ctl2 >> 16;
 	if (!panel->backlight.max)
 		return -ENODEV;
 	if (IS_PINEVIEW(dev))
 		panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
+	panel->backlight.max = ctl >> 17;
-	panel->backlight.max = ctl >> 17;
+	if (!panel->backlight.max) {
+		panel->backlight.max = get_backlight_max_vbt(connector);
-	if (panel->backlight.combination_mode)
+		panel->backlight.max >>= 1;
 		panel->backlight.max *= 0xff;
+	if (!panel->backlight.max)
+		return -ENODEV;
-	if (!panel->backlight.max)
+	if (panel->backlight.combination_mode)
-		return -ENODEV;
+		panel->backlight.max *= 0xff;
 	panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
 	panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
 	ctl = I915_READ(BLC_PWM_CTL);
+	panel->backlight.max = ctl >> 16;
-	panel->backlight.max = ctl >> 16;
-	if (panel->backlight.combination_mode)
+	if (!panel->backlight.max)
-		panel->backlight.max *= 0xff;
+		panel->backlight.max = get_backlight_max_vbt(connector);
+	if (!panel->backlight.max)
+		return -ENODEV;
-	if (!panel->backlight.max)
+	if (panel->backlight.combination_mode)
-		return -ENODEV;
+		panel->backlight.max *= 0xff;
 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
+{
 	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_panel *panel = &connector->panel;
-	enum pipe p;
 	u32 ctl, ctl2, val;
-	for_each_pipe(dev_priv, p) {
-		u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
-		/* Skip if the modulation freq is already set */
-		if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
-			continue;
-		cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
-		I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
-			   cur_val);
-	}
 	if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 		return -ENODEV;
 	ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 	panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
+	ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
+	panel->backlight.max = ctl >> 16;
 	if (!panel->backlight.max)
-	ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
+		panel->backlight.max = get_backlight_max_vbt(connector);
 	panel->backlight.max = ctl >> 16;
 		panel->backlight.level != 0;
 	return 0;
+}
+static int
+bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
+	u32 pwm_ctl, val;
+	/*
+	 * For BXT hard coding the Backlight controller to 0.
+	 * TODO : Read the controller value from VBT and generalize
+	 */
+	panel->backlight.controller = 0;
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	/* Keeping the check if controller 1 is to be programmed.
+	 * This will come into affect once the VBT parsing
+	 * is fixed for controller selection, and controller 1 is used
+	 * for a prticular display configuration.
+	 */
+	if (panel->backlight.controller == 1) {
+		val = I915_READ(UTIL_PIN_CTL);
+		panel->backlight.util_pin_active_low =
+					val & UTIL_PIN_POLARITY;
+	}
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+	if (!panel->backlight.max)
+		return -ENODEV;
+	val = bxt_get_backlight(connector);
+	panel->backlight.level = intel_panel_compute_brightness(connector, val);
+	panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
+		panel->backlight.level != 0;
+	return 0;
+}
+static int pwm_setup_backlight(struct intel_connector *connector,
+			       enum pipe pipe)
+{
+	struct drm_device *dev = connector->base.dev;
+	struct intel_panel *panel = &connector->panel;
+	int retval;
+	/* Get the PWM chip for backlight control */
+	panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
+	if (IS_ERR(panel->backlight.pwm)) {
+		DRM_ERROR("Failed to own the pwm chip\n");
+		panel->backlight.pwm = NULL;
+		return -ENODEV;
+	}
+	retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
+			    CRC_PMIC_PWM_PERIOD_NS);
+	if (retval < 0) {
+		DRM_ERROR("Failed to configure the pwm chip\n");
+		pwm_put(panel->backlight.pwm);
+		panel->backlight.pwm = NULL;
+		return retval;
+	}
+	panel->backlight.min = 0; /* 0% */
+	panel->backlight.max = 100; /* 100% */
+	panel->backlight.level = DIV_ROUND_UP(
+				 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
+				 CRC_PMIC_PWM_PERIOD_NS);
+	panel->backlight.enabled = panel->backlight.level != 0;
+	return 0;
+}
 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
+{
 	struct drm_device *dev = connector->dev;
 			DRM_DEBUG_KMS("no backlight present per VBT\n");
-		return 0;
+			return 0;
+		}
+	}
+	/* ensure intel_panel has been initialized first */
+	if (WARN_ON(!panel->backlight.setup))
+		return -ENODEV;
 	/* set level and max in panel struct */
 	mutex_lock(&dev_priv->backlight_lock);
-	ret = dev_priv->display.setup_backlight(intel_connector, pipe);
+	ret = panel->backlight.setup(intel_connector, pipe);
 	mutex_unlock(&dev_priv->backlight_lock);
 	if (ret) {
 void intel_panel_destroy_backlight(struct drm_connector *connector)
+{
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct intel_panel *panel = &intel_connector->panel;
+	/* dispose of the pwm */
+	if (panel->backlight.pwm)
+		pwm_put(panel->backlight.pwm);
 	panel->backlight.present = false;
+}
+/* Set up chip specific backlight functions */
-/* Set up chip specific backlight functions */
+static void
+intel_panel_init_backlight_funcs(struct intel_panel *panel)
+{
+	struct intel_connector *intel_connector =
-void intel_panel_init_backlight_funcs(struct drm_device *dev)
+		container_of(panel, struct intel_connector, panel);
-{
+	struct drm_device *dev = intel_connector->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	if (IS_BROXTON(dev)) {
+		panel->backlight.setup = bxt_setup_backlight;
+		panel->backlight.enable = bxt_enable_backlight;
+		panel->backlight.disable = bxt_disable_backlight;
-	struct drm_i915_private *dev_priv = dev->dev_private;
+		panel->backlight.set = bxt_set_backlight;
+		panel->backlight.get = bxt_get_backlight;
-	if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
+	} else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
-		dev_priv->display.setup_backlight = bdw_setup_backlight;
+		panel->backlight.setup = lpt_setup_backlight;
-		dev_priv->display.enable_backlight = bdw_enable_backlight;
+		panel->backlight.enable = lpt_enable_backlight;
-		dev_priv->display.disable_backlight = pch_disable_backlight;
+		panel->backlight.disable = lpt_disable_backlight;
+		panel->backlight.set = lpt_set_backlight;
+		panel->backlight.get = lpt_get_backlight;
+		if (HAS_PCH_LPT(dev))
+			panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
-		dev_priv->display.set_backlight = bdw_set_backlight;
+		else
-		dev_priv->display.get_backlight = bdw_get_backlight;
+			panel->backlight.hz_to_pwm = spt_hz_to_pwm;
 	} else if (HAS_PCH_SPLIT(dev)) {
-		dev_priv->display.setup_backlight = pch_setup_backlight;
+		panel->backlight.setup = pch_setup_backlight;
-		dev_priv->display.enable_backlight = pch_enable_backlight;
+		panel->backlight.enable = pch_enable_backlight;
-		dev_priv->display.disable_backlight = pch_disable_backlight;
+		panel->backlight.disable = pch_disable_backlight;
+		panel->backlight.set = pch_set_backlight;
-		dev_priv->display.set_backlight = pch_set_backlight;
+		panel->backlight.get = pch_get_backlight;
+		panel->backlight.hz_to_pwm = pch_hz_to_pwm;
+	} else if (IS_VALLEYVIEW(dev)) {
+		if (dev_priv->vbt.has_mipi) {
+			panel->backlight.setup = pwm_setup_backlight;
+			panel->backlight.enable = pwm_enable_backlight;
+			panel->backlight.disable = pwm_disable_backlight;
+			panel->backlight.set = pwm_set_backlight;
-		dev_priv->display.get_backlight = pch_get_backlight;
+			panel->backlight.get = pwm_get_backlight;
-	} else if (IS_VALLEYVIEW(dev)) {
+		} else {
-		dev_priv->display.setup_backlight = vlv_setup_backlight;
+			panel->backlight.setup = vlv_setup_backlight;
-		dev_priv->display.enable_backlight = vlv_enable_backlight;
+			panel->backlight.enable = vlv_enable_backlight;
-		dev_priv->display.disable_backlight = vlv_disable_backlight;
+			panel->backlight.disable = vlv_disable_backlight;
+			panel->backlight.set = vlv_set_backlight;
+			panel->backlight.get = vlv_get_backlight;
-		dev_priv->display.set_backlight = vlv_set_backlight;
+			panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
-		dev_priv->display.get_backlight = vlv_get_backlight;
+		}
 	} else if (IS_GEN4(dev)) {
-		dev_priv->display.setup_backlight = i965_setup_backlight;
+		panel->backlight.setup = i965_setup_backlight;
-		dev_priv->display.enable_backlight = i965_enable_backlight;
+		panel->backlight.enable = i965_enable_backlight;
-		dev_priv->display.disable_backlight = i965_disable_backlight;
+		panel->backlight.disable = i965_disable_backlight;
+		panel->backlight.set = i9xx_set_backlight;
-		dev_priv->display.set_backlight = i9xx_set_backlight;
+		panel->backlight.get = i9xx_get_backlight;
-		dev_priv->display.get_backlight = i9xx_get_backlight;
+		panel->backlight.hz_to_pwm = i965_hz_to_pwm;
 	} else {
-		dev_priv->display.setup_backlight = i9xx_setup_backlight;
+		panel->backlight.setup = i9xx_setup_backlight;
-		dev_priv->display.enable_backlight = i9xx_enable_backlight;
+		panel->backlight.enable = i9xx_enable_backlight;
-		dev_priv->display.disable_backlight = i9xx_disable_backlight;
+		panel->backlight.disable = i9xx_disable_backlight;
+		panel->backlight.set = i9xx_set_backlight;
-		dev_priv->display.set_backlight = i9xx_set_backlight;
+		panel->backlight.get = i9xx_get_backlight;
-		dev_priv->display.get_backlight = i9xx_get_backlight;
+		panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
+	}
+}
 int intel_panel_init(struct intel_panel *panel,
+		     struct drm_display_mode *fixed_mode,
+		     struct drm_display_mode *downclock_mode)
 		     struct drm_display_mode *fixed_mode,
-		     struct drm_display_mode *downclock_mode)
+	intel_panel_init_backlight_funcs(panel);
 	panel->fixed_mode = fixed_mode;

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/i915/intel_panel.c – Rev 5354 → 6084