On 02/03/2012 12:22 PM, Eugeni Dodonov wrote:
> This adds the workaround for WaCatErrorRejectionIssue which could result in a
> system hang..
>
> Signed-off-by: Eugeni Dodonov<eugeni.dodonov at intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 4 ++++
> drivers/gpu/drm/i915/intel_display.c | 4 ++++
> 2 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 92274b1..4f25cd5 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3035,6 +3035,10 @@
> #define GEN7_L3_CHICKEN_MODE_REGISTER 0xB030
> #define GEN7_WA_L3_CHICKEN_MODE 0x20000000
>
> +/* WaCatErrorRejectionIssue */
> +#define GEN7_SQ_CHICKEN_MBCUNIT_CONFIG 0x9030
> +#define GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB (1<<11)
> +
> /* PCH */
>
> /* south display engine interrupt */
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 49e5870..f7e86b8 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8451,6 +8451,10 @@ static void gen6_init_clock_gating(struct drm_device *dev)
> I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
> GEN7_WA_L3_CHICKEN_MODE);
>
> + I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
> + I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
> + GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
> +
> for_each_pipe(pipe) {
> I915_WRITE(DSPCNTR(pipe),
> I915_READ(DSPCNTR(pipe)) |
Ditto: shouldn't this be in ivybridge_init_clock_gating?
This does match the docs (vol1g GT Interface Register [IVB] > GT
Interface Register DevIVB > MBCunit Config Space > SQCM - SQ Chicken Modes).
Assuming it gets in a Gen7-specific location...
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
