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drm/i915: Fix CRT hotplug regression in 2.6.35-rc1

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Commit 7a772c492f has two bugs which
made the hotplug problems on my laptop worse instead of better.

First, it did not, in fact, disable the CRT plug interrupt -- it
disabled all the other hotplug interrupts.  It seems rather doubtful
that that bit of the patch fixed anything, so let's just remove it.
(If you want to add it back, you probably meant ~CRT_HOTPLUG_INT_EN.)

Second, on at least my GM45, setting CRT_HOTPLUG_ACTIVATION_PERIOD_64
and CRT_HOTPLUG_VOLTAGE_COMPARE_50 (when they were previously unset)
causes a hotplug interrupt about three seconds later.  The old code
never restored PORT_HOTPLUG_EN so this could only happen once, but
they new code restores those registers.  So just set those bits when
we set up the interrupt in the first place.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Andy Lutomirski 2010-06-12 05:21:18 -04:00 committed by Eric Anholt
parent fe27d53e5c
commit 2d1c9752ea
3 changed files with 11 additions and 8 deletions
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12
drivers/gpu/drm/i915/i915_irq.c
View file

@ -1434,8 +1434,18 @@ int i915_driver_irq_postinstall(struct drm_device *dev)
hotplug_en |= SDVOC_HOTPLUG_INT_EN;
if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS)
hotplug_en |= SDVOB_HOTPLUG_INT_EN;
if (dev_priv->hotplug_supported_mask & CRT_HOTPLUG_INT_STATUS)
if (dev_priv->hotplug_supported_mask & CRT_HOTPLUG_INT_STATUS) {
hotplug_en |= CRT_HOTPLUG_INT_EN;
/* Programming the CRT detection parameters tends
to generate a spurious hotplug event about three
seconds later. So just do it once.
*/
if (IS_G4X(dev))
hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
}
/* Ignore TV since it's buggy */
I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);

1
drivers/gpu/drm/i915/i915_reg.h
View file

@ -1134,7 +1134,6 @@
#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 HDMIB_HOTPLUG_INT_STATUS (1 << 29)

6
drivers/gpu/drm/i915/intel_crt.c
View file

@ -234,14 +234,8 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector)
else
tries = 1;
hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
hotplug_en &= CRT_HOTPLUG_MASK;
hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
if (IS_G4X(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 */