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Commit 771cb081 authored by Zhao Yakui's avatar Zhao Yakui Committed by Eric Anholt
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drm/i915: Sync crt hotplug detection with intel video driver 



This covers:
Use long crt hotplug activation time on GM45.

Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
parent 6bcdcd9e

drivers/gpu/drm/i915/i915_reg.h

+16 −0
Original line number Original line Diff line number Diff line
@@ -633,6 +633,22 @@ 
#define   TV_HOTPLUG_INT_EN			(1 << 18)

#define   TV_HOTPLUG_INT_EN			(1 << 18)

#define   CRT_HOTPLUG_INT_EN			(1 << 9)

#define   CRT_HOTPLUG_INT_EN			(1 << 9)

#define   CRT_HOTPLUG_FORCE_DETECT		(1 << 3)

#define   CRT_HOTPLUG_FORCE_DETECT		(1 << 3)

#define CRT_HOTPLUG_ACTIVATION_PERIOD_32	(0 << 8)

/* must use period 64 on GM45 according to docs */

#define CRT_HOTPLUG_ACTIVATION_PERIOD_64	(1 << 8)

#define CRT_HOTPLUG_DAC_ON_TIME_2M		(0 << 7)

#define CRT_HOTPLUG_DAC_ON_TIME_4M		(1 << 7)

#define CRT_HOTPLUG_VOLTAGE_COMPARE_40		(0 << 5)

#define CRT_HOTPLUG_VOLTAGE_COMPARE_50		(1 << 5)

#define CRT_HOTPLUG_VOLTAGE_COMPARE_60		(2 << 5)

#define CRT_HOTPLUG_VOLTAGE_COMPARE_70		(3 << 5)

#define CRT_HOTPLUG_VOLTAGE_COMPARE_MASK	(3 << 5)

#define CRT_HOTPLUG_DETECT_DELAY_1G		(0 << 4)

#define CRT_HOTPLUG_DETECT_DELAY_2G		(1 << 4)

#define CRT_HOTPLUG_DETECT_VOLTAGE_325MV	(0 << 2)

#define CRT_HOTPLUG_DETECT_VOLTAGE_475MV	(1 << 2)

#define CRT_HOTPLUG_MASK			(0x3fc) /* Bits 9-2 */







#define PORT_HOTPLUG_STAT	0x61114

#define PORT_HOTPLUG_STAT	0x61114

#define   HDMIB_HOTPLUG_INT_STATUS		(1 << 29)

#define   HDMIB_HOTPLUG_INT_STATUS		(1 << 29)

drivers/gpu/drm/i915/intel_crt.c

+32 −13
Original line number Original line Diff line number Diff line
@@ -146,20 +146,39 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector) 
{

{

	struct drm_device *dev = connector->dev;

	struct drm_device *dev = connector->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 temp;

	u32 hotplug_en;



	int i, tries = 0;

	unsigned long timeout = jiffies + msecs_to_jiffies(1000);

	/*



	 * On 4 series desktop, CRT detect sequence need to be done twice

	temp = I915_READ(PORT_HOTPLUG_EN);

	 * to get a reliable result.



	 */

	I915_WRITE(PORT_HOTPLUG_EN,

		   temp | CRT_HOTPLUG_FORCE_DETECT | (1 << 5));





	if (IS_G4X(dev) && !IS_GM45(dev))

		tries = 2;

	else

		tries = 1;

	hotplug_en = I915_READ(PORT_HOTPLUG_EN);

	hotplug_en &= ~(CRT_HOTPLUG_MASK);

	hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;



	if (IS_GM45(dev))

		hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;



	hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;



	for (i = 0; i < tries ; i++) {

		unsigned long timeout;

		/* turn on the FORCE_DETECT */

		I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);

		timeout = jiffies + msecs_to_jiffies(1000);

		/* wait for FORCE_DETECT to go off */

		do {

		do {

		if (!(I915_READ(PORT_HOTPLUG_EN) & CRT_HOTPLUG_FORCE_DETECT))

			if (!(I915_READ(PORT_HOTPLUG_EN) &

					CRT_HOTPLUG_FORCE_DETECT))

				break;

				break;

			msleep(1);

			msleep(1);

		} while (time_after(timeout, jiffies));

		} while (time_after(timeout, jiffies));

	}





	if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==

	if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==

	    CRT_HOTPLUG_MONITOR_COLOR)

	    CRT_HOTPLUG_MONITOR_COLOR)