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drm/i915/bw: Fix 'deinterleave' rounding direction

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For some reason we're rounding up when calculating the deinterleave
value. But the spec says we should round down. Fix it.

But I suppose this doesn't actually matter since the deinterleave
values should always be power of two. The only exception is therefore
the deinterleave==1 case, which gets handled by the max(..., 1).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260522200346.17377-5-ville.syrjala@linux.intel.com
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
This commit is contained in:
Ville Syrjälä 2026-05-22 23:03:40 +03:00
parent 615b23a7d2
commit 67309d7fbe
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_bw.c
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@ -607,7 +607,7 @@ static int tgl_get_bw_info(struct intel_display *display,
qi.deinterleave = qi.deinterleave ? : DIV_ROUND_UP(num_channels, is_y_tile ? 4 : 2);
if (num_channels < qi.max_numchannels && DISPLAY_VER(display) >= 12)
qi.deinterleave = max(DIV_ROUND_UP(qi.deinterleave, 2), 1);
qi.deinterleave = max(qi.deinterleave / 2, 1);
if (DISPLAY_VER(display) >= 12 && num_channels > qi.max_numchannels)
drm_warn(display->drm, "Number of channels exceeds max number of channels.");