> On 26 Jan 2018, at 6:25 AM, Rodrigo Vivi <rodrigo.v...@intel.com> wrote:
>
> 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 <radhakrishna.srip...@intel.com>
> Cc: Jani Nikula <jani.nik...@intel.com>
> Cc: Kai Heng Feng <kai.heng.f...@canonical.com>
> Cc: Lucas De Marchi <lucas.demar...@intel.com>
> Suggested-by: Lucas De Marchi <lucas.demar...@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
Tested-by: Kai-Heng Feng <kai.heng.f...@canonical.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 95f0b310d656..cf3f8f1ba6f7 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;
> }
> --
> 2.13.6
>
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