/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Jani Nikula <jani.nikula@intel.com>
*/
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/i915_drm.h>
#include <drm/drm_panel.h>
#include <drm/drm_mipi_dsi.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include "i915_drv.h"
#include "intel_drv.h"
#include "intel_dsi.h"
static const struct {
u16 panel_id;
struct drm_panel * (*init)(struct intel_dsi *intel_dsi, u16 panel_id);
} intel_dsi_drivers[] = {
{
.panel_id = MIPI_DSI_GENERIC_PANEL_ID,
.init = vbt_panel_init,
},
};
static void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
{
struct drm_encoder *encoder = &intel_dsi->base.base;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 mask;
mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |
LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;
if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & mask) == mask, 100))
DRM_ERROR("DPI FIFOs are not empty\n");
}
static void write_data(struct drm_i915_private *dev_priv,
i915_reg_t reg,
const u8 *data, u32 len)
{
u32 i, j;
for (i = 0; i < len; i += 4) {
u32 val = 0;
for (j = 0; j < min_t(u32, len - i, 4); j++)
val |= *data++ << 8 * j;
I915_WRITE(reg, val);
}
}
static void read_data(struct drm_i915_private *dev_priv,
i915_reg_t reg,
u8 *data, u32 len)
{
u32 i, j;
for (i = 0; i < len; i += 4) {
u32 val = I915_READ(reg);
for (j = 0; j < min_t(u32, len - i, 4); j++)
*data++ = val >> 8 * j;
}
}
static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,
const struct mipi_dsi_msg *msg)
{
struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = intel_dsi_host->port;
struct mipi_dsi_packet packet;
ssize_t ret;
const u8 *header, *data;
i915_reg_t data_reg, ctrl_reg;
u32 data_mask, ctrl_mask;
ret = mipi_dsi_create_packet(&packet, msg);
if (ret < 0)
return ret;
header = packet.header;
data = packet.payload;
if (msg->flags & MIPI_DSI_MSG_USE_LPM) {
data_reg = MIPI_LP_GEN_DATA(port);
data_mask = LP_DATA_FIFO_FULL;
ctrl_reg = MIPI_LP_GEN_CTRL(port);
ctrl_mask = LP_CTRL_FIFO_FULL;
} else {
data_reg = MIPI_HS_GEN_DATA(port);
data_mask = HS_DATA_FIFO_FULL;
ctrl_reg = MIPI_HS_GEN_CTRL(port);
ctrl_mask = HS_CTRL_FIFO_FULL;
}
/* note: this is never true for reads */
if (packet.payload_length) {
if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & data_mask) == 0, 50))
DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");
write_data(dev_priv, data_reg, packet.payload,
packet.payload_length);
}
if (msg->rx_len) {
I915_WRITE(MIPI_INTR_STAT(port), GEN_READ_DATA_AVAIL);
}
if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & ctrl_mask) == 0, 50)) {
DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
}
I915_WRITE(ctrl_reg, header[2] << 16 | header[1] << 8 | header[0]);
/* ->rx_len is set only for reads */
if (msg->rx_len) {
data_mask = GEN_READ_DATA_AVAIL;
if (wait_for((I915_READ(MIPI_INTR_STAT(port)) & data_mask) == data_mask, 50))
DRM_ERROR("Timeout waiting for read data.\n");
read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);
}
/* XXX: fix for reads and writes */
return 4 + packet.payload_length;
}
static int intel_dsi_host_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *dsi)
{
return 0;
}
static int intel_dsi_host_detach(struct mipi_dsi_host *host,
struct mipi_dsi_device *dsi)
{
return 0;
}
static const struct mipi_dsi_host_ops intel_dsi_host_ops = {
.attach = intel_dsi_host_attach,
.detach = intel_dsi_host_detach,
.transfer = intel_dsi_host_transfer,
};
static struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
enum port port)
{
struct intel_dsi_host *host;
struct mipi_dsi_device *device;
host = kzalloc(sizeof(*host), GFP_KERNEL);
if (!host)
return NULL;
host->base.ops = &intel_dsi_host_ops;
host->intel_dsi = intel_dsi;
host->port = port;
/*
* We should call mipi_dsi_host_register(&host->base) here, but we don't
* have a host->dev, and we don't have OF stuff either. So just use the
* dsi framework as a library and hope for the best. Create the dsi
* devices by ourselves here too. Need to be careful though, because we
* don't initialize any of the driver model devices here.
*/
device = kzalloc(sizeof(*device), GFP_KERNEL);
if (!device) {
kfree(host);
return NULL;
}
device->host = &host->base;
host->device = device;
return host;
}
/*
* send a video mode command
*
* XXX: commands with data in MIPI_DPI_DATA?
*/
static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
enum port port)
{
struct drm_encoder *encoder = &intel_dsi->base.base;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 mask;
/* XXX: pipe, hs */
if (hs)
cmd &= ~DPI_LP_MODE;
else
cmd |= DPI_LP_MODE;
/* clear bit */
I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
/* XXX: old code skips write if control unchanged */
if (cmd == I915_READ(MIPI_DPI_CONTROL(port)))
DRM_ERROR("Same special packet %02x twice in a row.\n", cmd);
I915_WRITE(MIPI_DPI_CONTROL(port), cmd);
mask = SPL_PKT_SENT_INTERRUPT;
if (wait_for((I915_READ(MIPI_INTR_STAT(port)) & mask) == mask, 100))
DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);
return 0;
}
static void band_gap_reset(struct drm_i915_private *dev_priv)
{
mutex_lock(&dev_priv->sb_lock);
vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);
udelay(150);
vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
mutex_unlock(&dev_priv->sb_lock);
}
static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
{
return intel_dsi->operation_mode == INTEL_DSI_VIDEO_MODE;
}
static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)
{
return intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE;
}
static bool intel_dsi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
base);
struct intel_connector *intel_connector = intel_dsi->attached_connector;
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
DRM_DEBUG_KMS("\n");
pipe_config->has_dsi_encoder = true;
if (fixed_mode)
intel_fixed_panel_mode(fixed_mode, adjusted_mode);
/* DSI uses short packets for sync events, so clear mode flags for DSI */
adjusted_mode->flags = 0;
return true;
}
static void bxt_dsi_device_ready(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 val;
DRM_DEBUG_KMS("\n");
/* Exit Low power state in 4 steps*/
for_each_dsi_port(port, intel_dsi->ports) {
/* 1. Enable MIPI PHY transparent latch */
val = I915_READ(BXT_MIPI_PORT_CTRL(port));
I915_WRITE(BXT_MIPI_PORT_CTRL(port), val | LP_OUTPUT_HOLD);
usleep_range(2000, 2500);
/* 2. Enter ULPS */
val = I915_READ(MIPI_DEVICE_READY(port));
val &= ~ULPS_STATE_MASK;
val |= (ULPS_STATE_ENTER | DEVICE_READY);
I915_WRITE(MIPI_DEVICE_READY(port), val);
usleep_range(2, 3);
/* 3. Exit ULPS */
val = I915_READ(MIPI_DEVICE_READY(port));
val &= ~ULPS_STATE_MASK;
val |= (ULPS_STATE_EXIT | DEVICE_READY);
I915_WRITE(MIPI_DEVICE_READY(port), val);
usleep_range(1000, 1500);
/* Clear ULPS and set device ready */
val = I915_READ(MIPI_DEVICE_READY(port));
val &= ~ULPS_STATE_MASK;
val |= DEVICE_READY;
I915_WRITE(MIPI_DEVICE_READY(port), val);
}
}
static void vlv_dsi_device_ready(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 val;
DRM_DEBUG_KMS("\n");
mutex_lock(&dev_priv->sb_lock);
/* program rcomp for compliance, reduce from 50 ohms to 45 ohms
* needed everytime after power gate */
vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
mutex_unlock(&dev_priv->sb_lock);
/* bandgap reset is needed after everytime we do power gate */
band_gap_reset(dev_priv);
for_each_dsi_port(port, intel_dsi->ports) {
I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_ENTER);
usleep_range(2500, 3000);
/* Enable MIPI PHY transparent latch
* Common bit for both MIPI Port A & MIPI Port C
* No similar bit in MIPI Port C reg
*/
val = I915_READ(MIPI_PORT_CTRL(PORT_A));
I915_WRITE(MIPI_PORT_CTRL(PORT_A), val | LP_OUTPUT_HOLD);
usleep_range(1000, 1500);
I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_EXIT);
usleep_range(2500, 3000);
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY);
usleep_range(2500, 3000);
}
}
static void intel_dsi_device_ready(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
vlv_dsi_device_ready(encoder);
else if (IS_BROXTON(dev))
bxt_dsi_device_ready(encoder);
}
static void intel_dsi_port_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
u32 temp;
temp = I915_READ(VLV_CHICKEN_3);
temp &= ~PIXEL_OVERLAP_CNT_MASK |
intel_dsi->pixel_overlap <<
PIXEL_OVERLAP_CNT_SHIFT;
I915_WRITE(VLV_CHICKEN_3, temp);
}
for_each_dsi_port(port, intel_dsi->ports) {
i915_reg_t port_ctrl = IS_BROXTON(dev) ?
BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
u32 temp;
temp = I915_READ(port_ctrl);
temp &= ~LANE_CONFIGURATION_MASK;
temp &= ~DUAL_LINK_MODE_MASK;
if (intel_dsi->ports == ((1 << PORT_A) | (1 << PORT_C))) {
temp |= (intel_dsi->dual_link - 1)
<< DUAL_LINK_MODE_SHIFT;
temp |= intel_crtc->pipe ?
LANE_CONFIGURATION_DUAL_LINK_B :
LANE_CONFIGURATION_DUAL_LINK_A;
}
/* assert ip_tg_enable signal */
I915_WRITE(port_ctrl, temp | DPI_ENABLE);
POSTING_READ(port_ctrl);
}
}
static void intel_dsi_port_disable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
for_each_dsi_port(port, intel_dsi->ports) {
i915_reg_t port_ctrl = IS_BROXTON(dev) ?
BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
u32 temp;
/* de-assert ip_tg_enable signal */
temp = I915_READ(port_ctrl);
I915_WRITE(port_ctrl, temp & ~DPI_ENABLE);
POSTING_READ(port_ctrl);
}
}
static void intel_dsi_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
DRM_DEBUG_KMS("\n");
if (is_cmd_mode(intel_dsi)) {
for_each_dsi_port(port, intel_dsi->ports)
I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
} else {
msleep(20); /* XXX */
for_each_dsi_port(port, intel_dsi->ports)
dpi_send_cmd(intel_dsi, TURN_ON, false, port);
msleep(100);
drm_panel_enable(intel_dsi->panel);
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
intel_dsi_port_enable(encoder);
}
intel_panel_enable_backlight(intel_dsi->attached_connector);
}
static void intel_dsi_prepare(struct intel_encoder *intel_encoder);
static void intel_dsi_pre_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
enum pipe pipe = intel_crtc->pipe;
enum port port;
u32 tmp;
DRM_DEBUG_KMS("\n");
intel_enable_dsi_pll(encoder);
intel_dsi_prepare(encoder);
/* Panel Enable over CRC PMIC */
if (intel_dsi->gpio_panel)
gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);
msleep(intel_dsi->panel_on_delay);
if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
/*
* Disable DPOunit clock gating, can stall pipe
* and we need DPLL REFA always enabled
*/
tmp = I915_READ(DPLL(pipe));
tmp |= DPLL_REF_CLK_ENABLE_VLV;
I915_WRITE(DPLL(pipe), tmp);
/* update the hw state for DPLL */
intel_crtc->config->dpll_hw_state.dpll =
DPLL_INTEGRATED_REF_CLK_VLV |
DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
tmp = I915_READ(DSPCLK_GATE_D);
tmp |= DPOUNIT_CLOCK_GATE_DISABLE;
I915_WRITE(DSPCLK_GATE_D, tmp);
}
/* put device in ready state */
intel_dsi_device_ready(encoder);
drm_panel_prepare(intel_dsi->panel);
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
/* Enable port in pre-enable phase itself because as per hw team
* recommendation, port should be enabled befor plane & pipe */
intel_dsi_enable(encoder);
}
static void intel_dsi_enable_nop(struct intel_encoder *encoder)
{
DRM_DEBUG_KMS("\n");
/* for DSI port enable has to be done before pipe
* and plane enable, so port enable is done in
* pre_enable phase itself unlike other encoders
*/
}
static void intel_dsi_pre_disable(struct intel_encoder *encoder)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
DRM_DEBUG_KMS("\n");
intel_panel_disable_backlight(intel_dsi->attached_connector);
if (is_vid_mode(intel_dsi)) {
/* Send Shutdown command to the panel in LP mode */
for_each_dsi_port(port, intel_dsi->ports)
dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);
msleep(10);
}
}
static void intel_dsi_disable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 temp;
DRM_DEBUG_KMS("\n");
if (is_vid_mode(intel_dsi)) {
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
intel_dsi_port_disable(encoder);
msleep(2);
}
for_each_dsi_port(port, intel_dsi->ports) {
/* Panel commands can be sent when clock is in LP11 */
I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
intel_dsi_reset_clocks(encoder, port);
I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
temp = I915_READ(MIPI_DSI_FUNC_PRG(port));
temp &= ~VID_MODE_FORMAT_MASK;
I915_WRITE(MIPI_DSI_FUNC_PRG(port), temp);
I915_WRITE(MIPI_DEVICE_READY(port), 0x1);
}
/* if disable packets are sent before sending shutdown packet then in
* some next enable sequence send turn on packet error is observed */
drm_panel_disable(intel_dsi->panel);
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
}
static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
DRM_DEBUG_KMS("\n");
for_each_dsi_port(port, intel_dsi->ports) {
/* Common bit for both MIPI Port A & MIPI Port C on VLV/CHV */
i915_reg_t port_ctrl = IS_BROXTON(dev) ?
BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(PORT_A);
u32 val;
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
ULPS_STATE_ENTER);
usleep_range(2000, 2500);
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
ULPS_STATE_EXIT);
usleep_range(2000, 2500);
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
ULPS_STATE_ENTER);
usleep_range(2000, 2500);
/* Wait till Clock lanes are in LP-00 state for MIPI Port A
* only. MIPI Port C has no similar bit for checking
*/
if (wait_for(((I915_READ(port_ctrl) & AFE_LATCHOUT)
== 0x00000), 30))
DRM_ERROR("DSI LP not going Low\n");
/* Disable MIPI PHY transparent latch */
val = I915_READ(port_ctrl);
I915_WRITE(port_ctrl, val & ~LP_OUTPUT_HOLD);
usleep_range(1000, 1500);
I915_WRITE(MIPI_DEVICE_READY(port), 0x00);
usleep_range(2000, 2500);
}
intel_disable_dsi_pll(encoder);
}
static void intel_dsi_post_disable(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
DRM_DEBUG_KMS("\n");
intel_dsi_disable(encoder);
intel_dsi_clear_device_ready(encoder);
if (!IS_BROXTON(dev_priv)) {
u32 val;
val = I915_READ(DSPCLK_GATE_D);
val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
I915_WRITE(DSPCLK_GATE_D, val);
}
drm_panel_unprepare(intel_dsi->panel);
msleep(intel_dsi->panel_off_delay);
msleep(intel_dsi->panel_pwr_cycle_delay);
/* Panel Disable over CRC PMIC */
if (intel_dsi->gpio_panel)
gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0);
}
static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
enum pipe *pipe)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct drm_device *dev = encoder->base.dev;
enum intel_display_power_domain power_domain;
enum port port;
bool ret;
DRM_DEBUG_KMS("\n");
power_domain = intel_display_port_power_domain(encoder);
if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
return false;
ret = false;
/* XXX: this only works for one DSI output */
for_each_dsi_port(port, intel_dsi->ports) {
i915_reg_t ctrl_reg = IS_BROXTON(dev) ?
BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
u32 dpi_enabled, func;
func = I915_READ(MIPI_DSI_FUNC_PRG(port));
dpi_enabled = I915_READ(ctrl_reg) & DPI_ENABLE;
/* Due to some hardware limitations on BYT, MIPI Port C DPI
* Enable bit does not get set. To check whether DSI Port C
* was enabled in BIOS, check the Pipe B enable bit
*/
if (IS_VALLEYVIEW(dev) && port == PORT_C)
dpi_enabled = I915_READ(PIPECONF(PIPE_B)) &
PIPECONF_ENABLE;
if (dpi_enabled || (func & CMD_MODE_DATA_WIDTH_MASK)) {
if (I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY) {
*pipe = port == PORT_A ? PIPE_A : PIPE_B;
ret = true;
goto out;
}
}
}
out:
intel_display_power_put(dev_priv, power_domain);
return ret;
}
static void intel_dsi_get_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
u32 pclk;
DRM_DEBUG_KMS("\n");
pipe_config->has_dsi_encoder = true;
/*
* DPLL_MD is not used in case of DSI, reading will get some default value
* set dpll_md = 0
*/
pipe_config->dpll_hw_state.dpll_md = 0;
pclk = intel_dsi_get_pclk(encoder, pipe_config->pipe_bpp);
if (!pclk)
return;
pipe_config->base.adjusted_mode.crtc_clock = pclk;
pipe_config->port_clock = pclk;
}
static enum drm_mode_status
intel_dsi_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
DRM_DEBUG_KMS("\n");
if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");
return MODE_NO_DBLESCAN;
}
if (fixed_mode) {
if (mode->hdisplay > fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL;
if (fixed_mode
->clock > max_dotclk
) return MODE_CLOCK_HIGH;
}
return MODE_OK;
}
/* return txclkesc cycles in terms of divider and duration in us */
static u16 txclkesc(u32 divider, unsigned int us)
{
switch (divider) {
case ESCAPE_CLOCK_DIVIDER_1:
default:
return 20 * us;
case ESCAPE_CLOCK_DIVIDER_2:
return 10 * us;
case ESCAPE_CLOCK_DIVIDER_4:
return 5 * us;
}
}
/* return pixels in terms of txbyteclkhs */
static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,
u16 burst_mode_ratio)
{
return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,
8 * 100), lane_count);
}
static void set_dsi_timings(struct drm_encoder *encoder,
const struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
enum port port;
unsigned int bpp = dsi_pixel_format_bpp(intel_dsi->pixel_format);
unsigned int lane_count = intel_dsi->lane_count;
u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
hactive = adjusted_mode->crtc_hdisplay;
hfp = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_hdisplay;
hsync = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
hbp = adjusted_mode->crtc_htotal - adjusted_mode->crtc_hsync_end;
if (intel_dsi->dual_link) {
hactive /= 2;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
hactive += intel_dsi->pixel_overlap;
hfp /= 2;
hsync /= 2;
hbp /= 2;
}
vfp = adjusted_mode->crtc_vsync_start - adjusted_mode->crtc_vdisplay;
vsync = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
vbp = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_end;
/* horizontal values are in terms of high speed byte clock */
hactive = txbyteclkhs(hactive, bpp, lane_count,
intel_dsi->burst_mode_ratio);
hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);
hsync = txbyteclkhs(hsync, bpp, lane_count,
intel_dsi->burst_mode_ratio);
hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);
for_each_dsi_port(port, intel_dsi->ports) {
if (IS_BROXTON(dev)) {
/*
* Program hdisplay and vdisplay on MIPI transcoder.
* This is different from calculated hactive and
* vactive, as they are calculated per channel basis,
* whereas these values should be based on resolution.
*/
I915_WRITE(BXT_MIPI_TRANS_HACTIVE(port),
adjusted_mode->crtc_hdisplay);
I915_WRITE(BXT_MIPI_TRANS_VACTIVE(port),
adjusted_mode->crtc_vdisplay);
I915_WRITE(BXT_MIPI_TRANS_VTOTAL(port),
adjusted_mode->crtc_vtotal);
}
I915_WRITE(MIPI_HACTIVE_AREA_COUNT(port), hactive);
I915_WRITE(MIPI_HFP_COUNT(port), hfp);
/* meaningful for video mode non-burst sync pulse mode only,
* can be zero for non-burst sync events and burst modes */
I915_WRITE(MIPI_HSYNC_PADDING_COUNT(port), hsync);
I915_WRITE(MIPI_HBP_COUNT(port), hbp);
/* vertical values are in terms of lines */
I915_WRITE(MIPI_VFP_COUNT(port), vfp);
I915_WRITE(MIPI_VSYNC_PADDING_COUNT(port), vsync);
I915_WRITE(MIPI_VBP_COUNT(port), vbp);
}
}
static void intel_dsi_prepare(struct intel_encoder *intel_encoder)
{
struct drm_encoder *encoder = &intel_encoder->base;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
enum port port;
unsigned int bpp = dsi_pixel_format_bpp(intel_dsi->pixel_format);
u32 val, tmp;
u16 mode_hdisplay;
DRM_DEBUG_KMS("pipe %c\n", pipe_name(intel_crtc->pipe));
mode_hdisplay = adjusted_mode->crtc_hdisplay;
if (intel_dsi->dual_link) {
mode_hdisplay /= 2;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
mode_hdisplay += intel_dsi->pixel_overlap;
}
for_each_dsi_port(port, intel_dsi->ports) {
if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
/*
* escape clock divider, 20MHz, shared for A and C.
* device ready must be off when doing this! txclkesc?
*/
tmp = I915_READ(MIPI_CTRL(PORT_A));
tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
I915_WRITE(MIPI_CTRL(PORT_A), tmp |
ESCAPE_CLOCK_DIVIDER_1);
/* read request priority is per pipe */
tmp = I915_READ(MIPI_CTRL(port));
tmp &= ~READ_REQUEST_PRIORITY_MASK;
I915_WRITE(MIPI_CTRL(port), tmp |
READ_REQUEST_PRIORITY_HIGH);
} else if (IS_BROXTON(dev)) {
enum pipe pipe = intel_crtc->pipe;
tmp = I915_READ(MIPI_CTRL(port));
tmp &= ~BXT_PIPE_SELECT_MASK;
tmp |= BXT_PIPE_SELECT(pipe);
I915_WRITE(MIPI_CTRL(port), tmp);
}
/* XXX: why here, why like this? handling in irq handler?! */
I915_WRITE(MIPI_INTR_STAT(port), 0xffffffff);
I915_WRITE(MIPI_INTR_EN(port), 0xffffffff);
I915_WRITE(MIPI_DPHY_PARAM(port), intel_dsi->dphy_reg);
I915_WRITE(MIPI_DPI_RESOLUTION(port),
adjusted_mode->crtc_vdisplay << VERTICAL_ADDRESS_SHIFT |
mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);
}
set_dsi_timings(encoder, adjusted_mode);
val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
if (is_cmd_mode(intel_dsi)) {
val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
} else {
val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
/* XXX: cross-check bpp vs. pixel format? */
val |= intel_dsi->pixel_format;
}
tmp = 0;
if (intel_dsi->eotp_pkt == 0)
tmp |= EOT_DISABLE;
if (intel_dsi->clock_stop)
tmp |= CLOCKSTOP;
for_each_dsi_port(port, intel_dsi->ports) {
I915_WRITE(MIPI_DSI_FUNC_PRG(port), val);
/* timeouts for recovery. one frame IIUC. if counter expires,
* EOT and stop state. */
/*
* In burst mode, value greater than one DPI line Time in byte
* clock (txbyteclkhs) To timeout this timer 1+ of the above
* said value is recommended.
*
* In non-burst mode, Value greater than one DPI frame time in
* byte clock(txbyteclkhs) To timeout this timer 1+ of the above
* said value is recommended.
*
* In DBI only mode, value greater than one DBI frame time in
* byte clock(txbyteclkhs) To timeout this timer 1+ of the above
* said value is recommended.
*/
if (is_vid_mode(intel_dsi) &&
intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
txbyteclkhs(adjusted_mode->crtc_htotal, bpp,
intel_dsi->lane_count,
intel_dsi->burst_mode_ratio) + 1);
} else {
I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
txbyteclkhs(adjusted_mode->crtc_vtotal *
adjusted_mode->crtc_htotal,
bpp, intel_dsi->lane_count,
intel_dsi->burst_mode_ratio) + 1);
}
I915_WRITE(MIPI_LP_RX_TIMEOUT(port), intel_dsi->lp_rx_timeout);
I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(port),
intel_dsi->turn_arnd_val);
I915_WRITE(MIPI_DEVICE_RESET_TIMER(port),
intel_dsi->rst_timer_val);
/* dphy stuff */
/* in terms of low power clock */
I915_WRITE(MIPI_INIT_COUNT(port),
txclkesc(intel_dsi->escape_clk_div, 100));
if (IS_BROXTON(dev) && (!intel_dsi->dual_link)) {
/*
* BXT spec says write MIPI_INIT_COUNT for
* both the ports, even if only one is
* getting used. So write the other port
* if not in dual link mode.
*/
I915_WRITE(MIPI_INIT_COUNT(port ==
PORT_A ? PORT_C : PORT_A),
intel_dsi->init_count);
}
/* recovery disables */
I915_WRITE(MIPI_EOT_DISABLE(port), tmp);
/* in terms of low power clock */
I915_WRITE(MIPI_INIT_COUNT(port), intel_dsi->init_count);
/* in terms of txbyteclkhs. actual high to low switch +
* MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
*
* XXX: write MIPI_STOP_STATE_STALL?
*/
I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(port),
intel_dsi->hs_to_lp_count);
/* XXX: low power clock equivalence in terms of byte clock.
* the number of byte clocks occupied in one low power clock.
* based on txbyteclkhs and txclkesc.
* txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL
* ) / 105.???
*/
I915_WRITE(MIPI_LP_BYTECLK(port), intel_dsi->lp_byte_clk);
/* the bw essential for transmitting 16 long packets containing
* 252 bytes meant for dcs write memory command is programmed in
* this register in terms of byte clocks. based on dsi transfer
* rate and the number of lanes configured the time taken to
* transmit 16 long packets in a dsi stream varies. */
I915_WRITE(MIPI_DBI_BW_CTRL(port), intel_dsi->bw_timer);
I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(port),
intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT |
intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);
if (is_vid_mode(intel_dsi))
/* Some panels might have resolution which is not a
* multiple of 64 like 1366 x 768. Enable RANDOM
* resolution support for such panels by default */
I915_WRITE(MIPI_VIDEO_MODE_FORMAT(port),
intel_dsi->video_frmt_cfg_bits |
intel_dsi->video_mode_format |
IP_TG_CONFIG |
RANDOM_DPI_DISPLAY_RESOLUTION);
}
}
static enum drm_connector_status
intel_dsi_detect(struct drm_connector *connector, bool force)
{
return connector_status_connected;
}
static int intel_dsi_get_modes(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *mode;
DRM_DEBUG_KMS("\n");
if (!intel_connector->panel.fixed_mode) {
DRM_DEBUG_KMS("no fixed mode\n");
return 0;
}
mode = drm_mode_duplicate(connector->dev,
intel_connector->panel.fixed_mode);
if (!mode) {
DRM_DEBUG_KMS("drm_mode_duplicate failed\n");
return 0;
}
drm_mode_probed_add(connector, mode);
return 1;
}
static void intel_dsi_connector_destroy(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
DRM_DEBUG_KMS("\n");
intel_panel_fini(&intel_connector->panel);
drm_connector_cleanup(connector);
kfree(connector);
}
static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
if (intel_dsi->panel) {
drm_panel_detach(intel_dsi->panel);
/* XXX: Logically this call belongs in the panel driver. */
drm_panel_remove(intel_dsi->panel);
}
/* dispose of the gpios */
if (intel_dsi->gpio_panel)
gpiod_put(intel_dsi->gpio_panel);
intel_encoder_destroy(encoder);
}
static const struct drm_encoder_funcs intel_dsi_funcs = {
.destroy = intel_dsi_encoder_destroy,
};
static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
.get_modes = intel_dsi_get_modes,
.mode_valid = intel_dsi_mode_valid,
.best_encoder = intel_best_encoder,
};
static const struct drm_connector_funcs intel_dsi_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.detect = intel_dsi_detect,
.destroy = intel_dsi_connector_destroy,
.fill_modes = drm_helper_probe_single_connector_modes,
.atomic_get_property = intel_connector_atomic_get_property,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
};
void intel_dsi_init(struct drm_device *dev)
{
struct intel_dsi *intel_dsi;
struct intel_encoder *intel_encoder;
struct drm_encoder *encoder;
struct intel_connector *intel_connector;
struct drm_connector *connector;
struct drm_display_mode *scan, *fixed_mode = NULL;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port;
unsigned int i;
DRM_DEBUG_KMS("\n");
/* There is no detection method for MIPI so rely on VBT */
if (!dev_priv->vbt.has_mipi)
return;
if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
dev_priv->mipi_mmio_base = VLV_MIPI_BASE;
} else {
DRM_ERROR("Unsupported Mipi device to reg base");
return;
}
intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
if (!intel_dsi)
return;
intel_connector = intel_connector_alloc();
if (!intel_connector) {
kfree(intel_dsi);
return;
}
intel_encoder = &intel_dsi->base;
encoder = &intel_encoder->base;
intel_dsi->attached_connector = intel_connector;
connector = &intel_connector->base;
drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI,
NULL);
intel_encoder->compute_config = intel_dsi_compute_config;
intel_encoder->pre_enable = intel_dsi_pre_enable;
intel_encoder->enable = intel_dsi_enable_nop;
intel_encoder->disable = intel_dsi_pre_disable;
intel_encoder->post_disable = intel_dsi_post_disable;
intel_encoder->get_hw_state = intel_dsi_get_hw_state;
intel_encoder->get_config = intel_dsi_get_config;
intel_connector->get_hw_state = intel_connector_get_hw_state;
intel_connector->unregister = intel_connector_unregister;
/* Pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI port C */
if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA) {
intel_encoder->crtc_mask = (1 << PIPE_A);
intel_dsi->ports = (1 << PORT_A);
} else if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIC) {
intel_encoder->crtc_mask = (1 << PIPE_B);
intel_dsi->ports = (1 << PORT_C);
}
if (dev_priv->vbt.dsi.config->dual_link)
intel_dsi->ports = ((1 << PORT_A) | (1 << PORT_C));
/* Create a DSI host (and a device) for each port. */
for_each_dsi_port(port, intel_dsi->ports) {
struct intel_dsi_host *host;
host = intel_dsi_host_init(intel_dsi, port);
if (!host)
goto err;
intel_dsi->dsi_hosts[port] = host;
}
for (i = 0; i < ARRAY_SIZE(intel_dsi_drivers); i++) {
intel_dsi->panel = intel_dsi_drivers[i].init(intel_dsi,
intel_dsi_drivers[i].panel_id);
if (intel_dsi->panel)
break;
}
if (!intel_dsi->panel) {
DRM_DEBUG_KMS("no device found\n");
goto err;
}
/*
* In case of BYT with CRC PMIC, we need to use GPIO for
* Panel control.
*/
if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
intel_dsi->gpio_panel =
gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH);
if (IS_ERR(intel_dsi->gpio_panel)) {
DRM_ERROR("Failed to own gpio for panel control\n");
intel_dsi->gpio_panel = NULL;
}
}
intel_encoder->type = INTEL_OUTPUT_DSI;
intel_encoder->cloneable = 0;
drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
DRM_MODE_CONNECTOR_DSI);
drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
connector->interlace_allowed = false;
connector->doublescan_allowed = false;
intel_connector_attach_encoder(intel_connector, intel_encoder);
drm_connector_register(connector);
drm_panel_attach(intel_dsi->panel, connector);
mutex_lock(&dev->mode_config.mutex);
drm_panel_get_modes(intel_dsi->panel);
list_for_each_entry(scan, &connector->probed_modes, head) {
if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
fixed_mode = drm_mode_duplicate(dev, scan);
break;
}
}
mutex_unlock(&dev->mode_config.mutex);
if (!fixed_mode) {
DRM_DEBUG_KMS("no fixed mode\n");
goto err;
}
intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
intel_panel_setup_backlight(connector, INVALID_PIPE);
return;
err:
drm_encoder_cleanup(&intel_encoder->base);
kfree(intel_dsi);
kfree(intel_connector);
}