[Intel-gfx] [PATCH 3/3] drm/i915/bios: assume vbt is 4-byte aligned into oprom

[Lucas De Marchi]

The unaligned ioread32() will make us read byte by byte looking for the
vbt. We could just as well have done a ioread8() + a shift and avoid the
extra confusion on how we are looking for "$VBT".

However when using ACPI it's guaranteed the VBT is 4-byte aligned
per spec, so we can probably assume it here as well.

v2: do not try to simplify the loop by eliminating the auxiliary counter
(Jani and Ville)

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/display/intel_bios.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 56e566945e98..fec6752b1f56 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -1909,7 +1909,7 @@ static struct vbt_header *oprom_get_vbt(struct drm_i915_private *dev_priv)
 		return NULL;
 
 	/* Scour memory looking for the VBT signature. */
-	for (i = 0; i + 4 < size; i++) {
+	for (i = 0; i + 4 < size; i += 4) {
 		if (ioread32(oprom + i) != *((const u32 *)"$VBT"))
 			continue;
 
-- 
2.24.0