From 3393ce1ed8fc43dbdb83952facaf04e644ca1d54 Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Thu, 25 Jan 2018 14:25:24 -0800 Subject: [PATCH] drm/i915/cnp: Properly handle VBT ddc pin out of bounds. If the table result is out of bounds on the array map there is something really wrong with VBT pin so we don't return that vbt_pin, but only return 0 instead. This basically reverts commit 'a8e6f3888b05 ("drm/i915/cnp: Ignore VBT request for know invalid DDC pin.")' Also this properly fixes commit 9c3b2689d01f ("drm/i915/cnl: Map VBT DDC Pin to BSpec DDC Pin.") v2: Do in a way that we don't break other platforms. (Jani) v3: Keep debug message (Jani) v4: Don't mess with 0 mapping was noticed by Jani and addressed with a simple solution suggested by Lucas that makes this even simpler. Fixes: a8e6f3888b05 ("drm/i915/cnp: Ignore VBT request for know invalid DDC pin.") Fixes: 9c3b2689d01f ("drm/i915/cnl: Map VBT DDC Pin to BSpec DDC Pin.") Cc: Radhakrishna Sripada Cc: Jani Nikula Cc: Kai Heng Feng Cc: Lucas De Marchi Suggested-by: Lucas De Marchi Signed-off-by: Rodrigo Vivi Reviewed-by: Lucas De Marchi Tested-by: Kai-Heng Feng Link: https://patchwork.freedesktop.org/patch/msgid/20180125222524.22059-1-rodrigo.vivi@intel.com --- drivers/gpu/drm/i915/intel_bios.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 95f0b31..cf3f8f1 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -1107,6 +1107,7 @@ static void sanitize_aux_ch(struct drm_i915_private *dev_priv, } static const u8 cnp_ddc_pin_map[] = { + [0] = 0, /* N/A */ [DDC_BUS_DDI_B] = GMBUS_PIN_1_BXT, [DDC_BUS_DDI_C] = GMBUS_PIN_2_BXT, [DDC_BUS_DDI_D] = GMBUS_PIN_4_CNP, /* sic */ @@ -1116,9 +1117,9 @@ 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)) { - if (vbt_pin > 0 && vbt_pin < ARRAY_SIZE(cnp_ddc_pin_map)) + if (vbt_pin < ARRAY_SIZE(cnp_ddc_pin_map)) { return cnp_ddc_pin_map[vbt_pin]; - if (vbt_pin > GMBUS_PIN_4_CNP) { + } else { DRM_DEBUG_KMS("Ignoring alternate pin: VBT claims DDC pin %d, which is not valid for this platform\n", vbt_pin); return 0; } -- 2.7.4