Let's ignore VBT request if the pin is clearly wrong.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104139
Cc: Kai Heng Feng <kai.heng.f...@canonical.com>
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
drivers/gpu/drm/i915/intel_bios.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_bios.c
b/drivers/gpu/drm/i915/intel_bios.c
index b0668202dc7e..95f0b310d656 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1115,9 +1115,14 @@ static const u8 cnp_ddc_pin_map[] = {
static u8 map_ddc_pin(struct drm_i915_private *dev_priv, u8 vbt_pin)
{
- if (HAS_PCH_CNP(dev_priv) &&
- vbt_pin > 0 && vbt_pin < ARRAY_SIZE(cnp_ddc_pin_map))
- return cnp_ddc_pin_map[vbt_pin];
+ if (HAS_PCH_CNP(dev_priv)) {
+ if (vbt_pin > 0 && vbt_pin < ARRAY_SIZE(cnp_ddc_pin_map))
+ return cnp_ddc_pin_map[vbt_pin];
+ if (vbt_pin > GMBUS_PIN_4_CNP) {
+ DRM_DEBUG_KMS("Ignoring alternate pin: VBT claims DDC
pin %d, which is not valid for this platform\n", vbt_pin);
+ return 0;
+ }
+ }
return vbt_pin;
}
--
2.13.6
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