tjh.dev / kernel
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drm/i915/gmbus: fix spurious timeout on 512-byte burst reads

When reading exactly 512 bytes with burst read enabled, the
extra_byte_added path breaks out of the inner do-while without
decrementing len. The outer while(len) then re-enters and gmbus_wait()
times out since all data has been delivered. Decrement len before the
break so the outer loop terminates correctly.

Fixes: d5dc0f43f268 ("drm/i915/gmbus: Enable burst read")
Signed-off-by: Samasth Norway Ananda <samasth.norway.ananda@oracle.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20260316231920.135438-2-samasth.norway.ananda@oracle.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit 4ab0f09ee73fc853d00466682635f67c531f909c)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

authored by

Samasth Norway Ananda and committed by
Joonas Lahtinen 08441f10 c3692998

+3 -1
+3 -1
drivers/gpu/drm/i915/display/intel_gmbus.c
··· 496 496 497 497 val = intel_de_read_fw(display, GMBUS3(display)); 498 498 do { 499 - if (extra_byte_added && len == 1) 499 + if (extra_byte_added && len == 1) { 500 + len--; 500 501 break; 502 + } 501 503 502 504 *buf++ = val & 0xff; 503 505 val >>= 8;