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drm/i915: Apply the 16Gb DIMM w/a only for the platforms that need it

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Currently the code assumes that every platform except dg2 need the
16Gb DIMM w/a, while in reality it's only needed by skl and icl (and
derivatives). Switch to a more specific platform check.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250919193000.17665-3-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä
2025-09-19 22:29:49 +03:00
parent a1d0a0549d
commit 8ebb8e1a0e
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/i915/display/skl_watermark.c
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@@ -3174,11 +3174,19 @@ void skl_watermark_ipc_init(struct intel_display *display)
skl_watermark_ipc_update(display);
}
static bool need_16gb_dimm_wa(struct intel_display *display)
{
const struct dram_info *dram_info = intel_dram_info(display->drm);
return (display->platform.skylake || display->platform.kabylake ||
display->platform.coffeelake || display->platform.cometlake ||
DISPLAY_VER(display) == 11) && dram_info->has_16gb_dimms;
}
static void
adjust_wm_latency(struct intel_display *display,
u16 wm[], int num_levels, int read_latency)
{
const struct dram_info *dram_info = intel_dram_info(display->drm);
int i, level;
/*
@@ -3214,7 +3222,7 @@ adjust_wm_latency(struct intel_display *display,
* any underrun. If not able to get DIMM info assume 16Gb+ DIMM
* to avoid any underrun.
*/
if (!display->platform.dg2 && dram_info->has_16gb_dimms)
if (need_16gb_dimm_wa(display))
wm[0] += 1;
}