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drm/i915: Document FBC related w/as more thoroughly

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Pimp the comments for the FBC related workarounds.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200708131223.9519-4-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
This commit is contained in:
Ville Syrjälä 2020-07-08 16:12:23 +03:00
parent cd7a88113d
commit 99bcf64e1c
1 changed files with 44 additions and 11 deletions
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55
drivers/gpu/drm/i915/intel_pm.c
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@ -94,7 +94,10 @@ static void gen9_init_clock_gating(struct drm_i915_private *dev_priv)
I915_WRITE(GEN8_CHICKEN_DCPR_1,
I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM);
/* WaFbcWakeMemOn:skl,bxt,kbl,glk,cfl */
/*
* WaFbcWakeMemOn:skl,bxt,kbl,glk,cfl
* Display WA #0859: skl,bxt,kbl,glk,cfl
*/
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_FBC_MEMORY_WAKE);
@ -135,11 +138,17 @@ static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)
*/
I915_WRITE(RM_TIMEOUT, MMIO_TIMEOUT_US(950));
/* WaFbcTurnOffFbcWatermark:bxt */
/*
* WaFbcTurnOffFbcWatermark:bxt
* Display WA #0562: bxt
*/
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_FBC_WM_DIS);
/* WaFbcHighMemBwCorruptionAvoidance:bxt */
/*
* WaFbcHighMemBwCorruptionAvoidance:bxt
* Display WA #0883: bxt
*/
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_DISABLE_DUMMY0);
}
@ -7165,7 +7174,10 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
I915_WRITE(GEN8_CHICKEN_DCPR_1,
I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM);
/* WaFbcWakeMemOn:cnl */
/*
* WaFbcWakeMemOn:cnl
* Display WA #0859: cnl
*/
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_FBC_MEMORY_WAKE);
@ -7191,11 +7203,17 @@ static void cfl_init_clock_gating(struct drm_i915_private *dev_priv)
cnp_init_clock_gating(dev_priv);
gen9_init_clock_gating(dev_priv);
/* WaFbcTurnOffFbcWatermark:cfl */
/*
* WaFbcTurnOffFbcWatermark:cfl
* Display WA #0562: cfl
*/
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_FBC_WM_DIS);
/* WaFbcNukeOnHostModify:cfl */
/*
* WaFbcNukeOnHostModify:cfl
* Display WA #0873: cfl
*/
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_NUKE_ON_ANY_MODIFICATION);
}
@ -7214,11 +7232,17 @@ static void kbl_init_clock_gating(struct drm_i915_private *dev_priv)
I915_WRITE(GEN6_UCGCTL1, I915_READ(GEN6_UCGCTL1) |
GEN6_GAMUNIT_CLOCK_GATE_DISABLE);
/* WaFbcTurnOffFbcWatermark:kbl */
/*
* WaFbcTurnOffFbcWatermark:kbl
* Display WA #0562: kbl
*/
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_FBC_WM_DIS);
/* WaFbcNukeOnHostModify:kbl */
/*
* WaFbcNukeOnHostModify:kbl
* Display WA #0873: kbl
*/
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_NUKE_ON_ANY_MODIFICATION);
}
@ -7231,15 +7255,24 @@ static void skl_init_clock_gating(struct drm_i915_private *dev_priv)
I915_WRITE(FBC_LLC_READ_CTRL, I915_READ(FBC_LLC_READ_CTRL) |
FBC_LLC_FULLY_OPEN);
/* WaFbcTurnOffFbcWatermark:skl */
/*
* WaFbcTurnOffFbcWatermark:skl
* Display WA #0562: skl
*/
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_FBC_WM_DIS);
/* WaFbcNukeOnHostModify:skl */
/*
* WaFbcNukeOnHostModify:skl
* Display WA #0873: skl
*/
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_NUKE_ON_ANY_MODIFICATION);
/* WaFbcHighMemBwCorruptionAvoidance:skl */
/*
* WaFbcHighMemBwCorruptionAvoidance:skl
* Display WA #0883: skl
*/
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_DISABLE_DUMMY0);
}