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drm/i915: Fix dbuf slice config lookup

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Apparently I totally fumbled the loop condition when I
removed the ARRAY_SIZE() stuff from the dbuf slice config
lookup. Comparing the loop index with the active_pipes bitmask
is utter nonsense, what we want to do is check to see if the
mask is zero or not.

Note that the code actually ended up working correctly despite
the fumble, up until commit eef1739544 ("drm/i915: Allow
!join_mbus cases for adlp+ dbuf configuration") when things
broke for real.

Cc: stable@vger.kernel.org
Fixes: 05e8155afe ("drm/i915: Use a sentinel to terminate the dbuf slice arrays")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220207132700.481-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2022-02-07 15:26:59 +02:00
parent 7938f42181
commit a28fde308c
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_pm.c
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@ -4848,7 +4848,7 @@ static u8 compute_dbuf_slices(enum pipe pipe, u8 active_pipes, bool join_mbus,
{
int i;
for (i = 0; i < dbuf_slices[i].active_pipes; i++) {
for (i = 0; dbuf_slices[i].active_pipes != 0; i++) {
if (dbuf_slices[i].active_pipes == active_pipes &&
dbuf_slices[i].join_mbus == join_mbus)
return dbuf_slices[i].dbuf_mask[pipe];