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drm/i915: Flip the sense of AGPBUSY_DIS bit

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My Gen3 Bspec lists the AGPBUSY# bit in INSTPM as an enable bit rather
than a disable bit. Our code has the opposite idea. Make the code match
the spec.

Might fix some gen3 C3 related interrupt delivery problems. Untested
due to lack of hardware.

v2: call it AGPBUSY_INT_EN to make it clearer it has to do with interrupts

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-02-25 15:13:39 +02:00 committed by Daniel Vetter
parent 12fabbcb9f
commit 3299254ffc
2 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
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@ -1179,7 +1179,7 @@ enum punit_power_well {
#define I915_ERROR_INSTRUCTION (1<<0)
#define INSTPM 0x020c0
#define INSTPM_SELF_EN (1<<12) /* 915GM only */
#define INSTPM_AGPBUSY_DIS (1<<11) /* gen3: when disabled, pending interrupts
#define INSTPM_AGPBUSY_INT_EN (1<<11) /* gen3: when disabled, pending interrupts
will not assert AGPBUSY# and will only
be delivered when out of C3. */
#define INSTPM_FORCE_ORDERING (1<<7) /* GEN6+ */

2
drivers/gpu/drm/i915/intel_pm.c
View File

@ -5506,7 +5506,7 @@ static void gen3_init_clock_gating(struct drm_device *dev)
I915_WRITE(ECOSKPD, _MASKED_BIT_DISABLE(ECO_FLIP_DONE));
/* interrupts should cause a wake up from C3 */
I915_WRITE(INSTPM, _MASKED_BIT_DISABLE(INSTPM_AGPBUSY_DIS));
I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_AGPBUSY_INT_EN));
}
static void i85x_init_clock_gating(struct drm_device *dev)