drm/i915 fixes that failed to backport to v4.15

drm/i915 fixes that failed to backport to v4.15

[Jani Nikula]

All, the following fixes selected based on the Fixes: tag failed to
backport to drm-next heading to v4.15.

8cf80a2e4b31 ("drm/i915/gvt: Rename reserved ring buffer")

This one I think shouldn't have included a Fixes: line in the first
place. While technically a rename can be a fix, I consider Fixes: to
indicate things that have a functional significance to the end user.

f2880e04f3a5 ("drm/i915/gvt: Move request alloc to dispatch_workload path only")
0cfecb7c4b9b ("Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk"")

If these are needed in v4.15, please provide backports based on the
drm-intel-next-fixes branch.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Technology Center
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Re: drm/i915 fixes that failed to backport to v4.15

[Zhenyu Wang]

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On 2017.11.21 12:20:00 +0200, Jani Nikula wrote:
> 
> All, the following fixes selected based on the Fixes: tag failed to
> backport to drm-next heading to v4.15.
> 
> 8cf80a2e4b31 ("drm/i915/gvt: Rename reserved ring buffer")
>

ignore this one, it's a fix for one refactor patch for 4.16.

> This one I think shouldn't have included a Fixes: line in the first
> place. While technically a rename can be a fix, I consider Fixes: to
> indicate things that have a functional significance to the end user.
> 
> f2880e04f3a5 ("drm/i915/gvt: Move request alloc to dispatch_workload path only")

I think this one is needed and will do backport.

> 0cfecb7c4b9b ("Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk"")
> 
> If these are needed in v4.15, please provide backports based on the
> drm-intel-next-fixes branch.
> 

thanks for notify!

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[PATCH] Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk"

[Rodrigo Vivi]

From: Radhakrishna Sripada <radhakrishna.sripada@intel.com>

This reverts commit 8f067837c4b713ce2e69be95af7b2a5eb3bd7de8.

HSD says "WA withdrawn. It was causing corruption with some images.
WA is not strictly necessary since this bug just causes loss of FBC
compression with some sizes and images, but doesn't break anything."

Fixes: 8f067837c4b7 ("drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk")
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171117010825.23118-1-radhakrishna.sripada@intel.com
(cherry picked from commit 0cfecb7c4b9b45ed1776162e132b43f92564f3f4)
---
 drivers/gpu/drm/i915/i915_reg.h |  3 ---
 drivers/gpu/drm/i915/intel_pm.c | 13 -------------
 2 files changed, 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 68a58cce6ab1..3866c49bc390 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2951,9 +2951,6 @@ enum i915_power_well_id {
 #define ILK_DPFC_CHICKEN	_MMIO(0x43224)
 #define   ILK_DPFC_DISABLE_DUMMY0 (1<<8)
 #define   ILK_DPFC_NUKE_ON_ANY_MODIFICATION	(1<<23)
-#define   GLK_SKIP_SEG_EN		(1<<12)
-#define   GLK_SKIP_SEG_COUNT_MASK	(3<<10)
-#define   GLK_SKIP_SEG_COUNT(x)		((x)<<10)
 #define ILK_FBC_RT_BASE		_MMIO(0x2128)
 #define   ILK_FBC_RT_VALID	(1<<0)
 #define   SNB_FBC_FRONT_BUFFER	(1<<1)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f4a4e9496893..f0d0dbab4150 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -124,7 +124,6 @@ static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)
 
 static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
 {
-	u32 val;
 	gen9_init_clock_gating(dev_priv);
 
 	/*
@@ -144,11 +143,6 @@ static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
 		I915_WRITE(CHICKEN_MISC_2, val);
 	}
 
-	/* Display WA #1133: WaFbcSkipSegments:glk */
-	val = I915_READ(ILK_DPFC_CHICKEN);
-	val &= ~GLK_SKIP_SEG_COUNT_MASK;
-	val |= GLK_SKIP_SEG_EN | GLK_SKIP_SEG_COUNT(1);
-	I915_WRITE(ILK_DPFC_CHICKEN, val);
 }
 
 static void i915_pineview_get_mem_freq(struct drm_i915_private *dev_priv)
@@ -8517,7 +8511,6 @@ static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
 
 static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
 {
-	u32 val;
 	cnp_init_clock_gating(dev_priv);
 
 	/* This is not an Wa. Enable for better image quality */
@@ -8537,12 +8530,6 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
 		I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE,
 			   I915_READ(SLICE_UNIT_LEVEL_CLKGATE) |
 			   SARBUNIT_CLKGATE_DIS);
-
-	/* Display WA #1133: WaFbcSkipSegments:cnl */
-	val = I915_READ(ILK_DPFC_CHICKEN);
-	val &= ~GLK_SKIP_SEG_COUNT_MASK;
-	val |= GLK_SKIP_SEG_EN | GLK_SKIP_SEG_COUNT(1);
-	I915_WRITE(ILK_DPFC_CHICKEN, val);
 }
 
 static void cfl_init_clock_gating(struct drm_i915_private *dev_priv)
-- 
2.13.6

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✗ Fi.CI.BAT: failure for Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk" (rev2)

[Patchwork]

== Series Details ==

Series: Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk" (rev2)
URL   : https://patchwork.freedesktop.org/series/33969/
State : failure

== Summary ==

Applying: Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk"
error: Failed to merge in the changes.
Using index info to reconstruct a base tree...
M	drivers/gpu/drm/i915/i915_reg.h
M	drivers/gpu/drm/i915/intel_pm.c
Falling back to patching base and 3-way merge...
Auto-merging drivers/gpu/drm/i915/intel_pm.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/i915/intel_pm.c
Patch failed at 0001 Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk"
The copy of the patch that failed is found in: .git/rebase-apply/patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

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Re: [PATCH] Revert "drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk"

[Joonas Lahtinen]

Hi,

Thanks, this was included in the pull.

One comment below, not strictly related to this patch.

On Wed, 2017-12-06 at 14:25 -0800, Rodrigo Vivi wrote:
> From: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> 
> This reverts commit 8f067837c4b713ce2e69be95af7b2a5eb3bd7de8.
> 
> HSD says "WA withdrawn. It was causing corruption with some images.
> WA is not strictly necessary since this bug just causes loss of FBC
> compression with some sizes and images, but doesn't break anything."
> 
> Fixes: 8f067837c4b7 ("drm/i915: Display WA #1133 WaFbcSkipSegments:cnl, glk")
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20171117010825.23118-1-radhakrishna.sripada@intel.com
> (cherry picked from commit 0cfecb7c4b9b45ed1776162e132b43f92564f3f4)

<SNIP>

> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -124,7 +124,6 @@ static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)
>  
>  static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
>  {
> -	u32 val;

This resulted being a pain because it got reused by another upstream
patch, so while this revert removed the variable, the newly added non-
conflicting code still depended on it.

More specific variable names like "dpfc" and allowing compiler to
decide when to optimize and recycle variables would have helped :)

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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