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drm/i915: Fix dbuf slice config lookup

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commit 698bef8ff5 upstream.

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>
(cherry picked from commit a28fde308c)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ville Syrjälä
2022-02-07 15:26:59 +02:00
committed by Greg Kroah-Hartman
parent d006f2fe7d
commit 34f5556ddf
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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@@ -4861,7 +4861,7 @@ 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];