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drm/i915/bw: Fix num_planes handling on TGL+

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The TGL+ bw code has an off by one error on the num_planes
calculation, and tgl_max_bw_index() incorrectly bumps
the num_planes to 1 from 0.

That approach made sense on ICL where num_planes is more or
less a minimum number of planes to consider for the group,
but on TGL+ num_planes really is a maximum number of planes,
so these adjustments no longer make any sense there.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260522200346.17377-2-ville.syrjala@linux.intel.com
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
This commit is contained in:
Ville Syrjälä 2026-05-22 23:03:37 +03:00
parent 771394b4fb
commit 85bfe1cec2
1 changed files with 1 additions and 7 deletions
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8
drivers/gpu/drm/i915/display/intel_bw.c
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@ -636,8 +636,7 @@ static int tgl_get_bw_info(struct intel_display *display,
bi_next = &display->bw.max[i + 1];
if (clpchgroup < clperchgroup)
bi_next->num_planes = (ipqdepth - clpchgroup) /
clpchgroup + 1;
bi_next->num_planes = (ipqdepth - clpchgroup) / clpchgroup;
else
bi_next->num_planes = 0;
}
@ -802,11 +801,6 @@ static unsigned int tgl_max_bw_index(struct intel_display *display,
{
int i;
/*
* Let's return max bw for 0 planes
*/
num_planes = max(1, num_planes);
for (i = ARRAY_SIZE(display->bw.max) - 1; i >= 0; i--) {
const struct intel_bw_info *bi =
&display->bw.max[i];