From: Ville Syrjälä <[email protected]> Every DSB instruction has to be 8byte aligned. Make sure that is the case for the non-indexed register writes as well. The way this could end up unaligned is we emitted an odd number of indexed register writes beforehand.
Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/display/intel_dsb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c index 90a22af30aab..6abfd0fc541a 100644 --- a/drivers/gpu/drm/i915/display/intel_dsb.c +++ b/drivers/gpu/drm/i915/display/intel_dsb.c @@ -172,6 +172,9 @@ void intel_dsb_reg_write(struct intel_dsb *dsb, return; } + /* Every instruction should be 8 byte aligned. */ + dsb->free_pos = ALIGN(dsb->free_pos, 2); + dsb->ins_start_offset = dsb->free_pos; buf[dsb->free_pos++] = val; buf[dsb->free_pos++] = (DSB_OPCODE_MMIO_WRITE << DSB_OPCODE_SHIFT) | -- 2.37.4
