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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>
(cherry picked from commit a8e6f3888b)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
hifive-unleashed-5.1
Rodrigo Vivi 2018-01-23 09:40:50 -08:00
parent b3ad99ed45
commit f24c606c21
1 changed files with 8 additions and 3 deletions
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11
drivers/gpu/drm/i915/intel_bios.c
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@ -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;
}