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Rev 1986 Rev 2160
Line 30... Line 30...
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/**
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/**
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 * radeon_ddc_probe
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 * radeon_ddc_probe
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 *
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 *
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 */
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 */
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bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
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bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool requires_extended_probe)
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{
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{
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	u8 out_buf[] = { 0x0, 0x0};
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	u8 out = 0x0;
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	u8 buf[2];
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	u8 buf[8];
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	int ret;
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	int ret;
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	struct i2c_msg msgs[] = {
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	struct i2c_msg msgs[] = {
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		{
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		{
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			.addr = 0x50,
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			.addr = 0x50,
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			.flags = 0,
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			.flags = 0,
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			.len = 1,
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			.len = 1,
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			.buf = out_buf,
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			.buf = &out,
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		},
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		},
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		{
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		{
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			.addr = 0x50,
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			.addr = 0x50,
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			.flags = I2C_M_RD,
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			.flags = I2C_M_RD,
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			.len = 1,
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			.len = 1,
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			.buf = buf,
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			.buf = buf,
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		}
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		}
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	};
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	/* Read 8 bytes from i2c for extended probe of EDID header */
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	if (requires_extended_probe)
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	};
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		msgs[1].len = 8;
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	/* on hw with routers, select right port */
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	/* on hw with routers, select right port */
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	if (radeon_connector->router.ddc_valid)
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	if (radeon_connector->router.ddc_valid)
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		radeon_router_select_ddc_port(radeon_connector);
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		radeon_router_select_ddc_port(radeon_connector);
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	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
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	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
 - 
 
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	if (ret != 2)
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		/* Couldn't find an accessible DDC on this connector */
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		return false;
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	if (requires_extended_probe) {
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		/* Probe also for valid EDID header
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		 * EDID header starts with:
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		 * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
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		 * Only the first 6 bytes must be valid as
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		 * drm_edid_block_valid() can fix the last 2 bytes */
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	if (ret == 2)
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		if (drm_edid_header_is_valid(buf) < 6) {
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		return true;
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			/* Couldn't find an accessible EDID on this
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			 * connector */
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			return false;
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		}
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	}
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	return false;
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		return true;
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}
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}