diff options
| author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2018-01-23 20:40:50 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2018-01-24 02:17:00 +0300 |
| commit | a8e6f3888b05c1e7b685800a3371ce050720368f (patch) | |
| tree | ad5bea8579a1ded6f4bb659b1ed01b0b487c2034 | |
| parent | bb5db7e1601b368e7aad5e4ceded75de70f6fddb (diff) | |
| download | linux-a8e6f3888b05c1e7b685800a3371ce050720368f.tar.xz | |
drm/i915/cnp: Ignore VBT request for know invalid DDC pin.
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.feng@canonical.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180123174050.4261-1-rodrigo.vivi@intel.com
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.c | 11 |
1 files 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; } |