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drm/i915/mtl: Fix Wa_16015201720 implementation
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The commit 2357f2b ("drm/i915/mtl: Initial display workarounds")
extended the workaround Wa_16015201720 to MTL. However the registers
that the original WA implemented moved for MTL.

Implement the workaround with the correct register.

v3: Skip clock gating for pipe C, D DMC's and fix the title

Fixes: 2357f2b ("drm/i915/mtl: Initial display workarounds")
Cc: Matt Atwood <matthew.s.atwood@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230301201053.928709-2-radhakrishna.sripada@intel.com
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Radhakrishna Sripada committed Mar 9, 2023
1 parent 4b736ed commit 0188be5
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Showing 2 changed files with 26 additions and 8 deletions.
26 changes: 21 additions & 5 deletions drivers/gpu/drm/i915/display/intel_dmc.c
Original file line number Diff line number Diff line change
Expand Up @@ -424,15 +424,12 @@ static void disable_all_event_handlers(struct drm_i915_private *i915)
}
}

static void pipedmc_clock_gating_wa(struct drm_i915_private *i915, bool enable)
static void adlp_pipedmc_clock_gating_wa(struct drm_i915_private *i915, bool enable)
{
enum pipe pipe;

if (DISPLAY_VER(i915) < 13)
return;

/*
* Wa_16015201720:adl-p,dg2, mtl
* Wa_16015201720:adl-p,dg2
* The WA requires clock gating to be disabled all the time
* for pipe A and B.
* For pipe C and D clock gating needs to be disabled only
Expand All @@ -448,6 +445,25 @@ static void pipedmc_clock_gating_wa(struct drm_i915_private *i915, bool enable)
PIPEDMC_GATING_DIS, 0);
}

static void mtl_pipedmc_clock_gating_wa(struct drm_i915_private *i915)
{
/*
* Wa_16015201720
* The WA requires clock gating to be disabled all the time
* for pipe A and B.
*/
intel_de_rmw(i915, GEN9_CLKGATE_DIS_0, 0,
MTL_PIPEDMC_GATING_DIS_A | MTL_PIPEDMC_GATING_DIS_B);
}

static void pipedmc_clock_gating_wa(struct drm_i915_private *i915, bool enable)
{
if (DISPLAY_VER(i915) >= 14 && enable)
mtl_pipedmc_clock_gating_wa(i915);
else if (DISPLAY_VER(i915) == 13)
adlp_pipedmc_clock_gating_wa(i915, enable);
}

void intel_dmc_enable_pipe(struct drm_i915_private *i915, enum pipe pipe)
{
enum intel_dmc_id dmc_id = PIPE_TO_DMC_ID(pipe);
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8 changes: 5 additions & 3 deletions drivers/gpu/drm/i915/i915_reg.h
Original file line number Diff line number Diff line change
Expand Up @@ -1794,9 +1794,11 @@
* GEN9 clock gating regs
*/
#define GEN9_CLKGATE_DIS_0 _MMIO(0x46530)
#define DARBF_GATING_DIS (1 << 27)
#define PWM2_GATING_DIS (1 << 14)
#define PWM1_GATING_DIS (1 << 13)
#define DARBF_GATING_DIS REG_BIT(27)
#define MTL_PIPEDMC_GATING_DIS_A REG_BIT(15)
#define MTL_PIPEDMC_GATING_DIS_B REG_BIT(14)
#define PWM2_GATING_DIS REG_BIT(14)
#define PWM1_GATING_DIS REG_BIT(13)

#define GEN9_CLKGATE_DIS_3 _MMIO(0x46538)
#define TGL_VRH_GATING_DIS REG_BIT(31)
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