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drm/i915: Implement display w/a 1140 for glk/cnl

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Display w/a #1140 tells us we have to program the transition
watermark to the minimum value on glk/cnl. Let's do that.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228203552.30273-4-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2020-02-28 22:35:52 +02:00
parent a7f1e8e45f
commit c834d03cca
1 changed files with 9 additions and 4 deletions
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13
drivers/gpu/drm/i915/intel_pm.c
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@ -5120,8 +5120,7 @@ static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
{
struct drm_device *dev = crtc_state->uapi.crtc->dev;
const struct drm_i915_private *dev_priv = to_i915(dev);
u16 trans_min, trans_y_tile_min;
const u16 trans_amount = 10; /* This is configurable amount */
u16 trans_min, trans_amount, trans_y_tile_min;
u16 wm0_sel_res_b, trans_offset_b, res_blocks;
/* Transition WM don't make any sense if ipc is disabled */
@ -5135,9 +5134,16 @@ static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
if (IS_GEN9_BC(dev_priv) || IS_BROXTON(dev_priv))
return;
trans_min = 14;
if (INTEL_GEN(dev_priv) >= 11)
trans_min = 4;
else
trans_min = 14;
/* Display WA #1140: glk,cnl */
if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
trans_amount = 0;
else
trans_amount = 10; /* This is configurable amount */
trans_offset_b = trans_min + trans_amount;
@ -5164,7 +5170,6 @@ static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
/* WA BUG:1938466 add one block for non y-tile planes */
if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_A0))
res_blocks += 1;
}
/*