On Thu, Apr 21, 2016 at 04:48:32PM +0530, Shashank Sharma wrote:
> This patch does the following:
> - Fakes live status of HDMI as connected (even if that's not).
> While testing certain (monitor + cable) combinations with
> various intel platforms, it seems that live status register
> doesn't work reliably on some older devices. So limit the
> live_status check for HDMI detection, only for platforms
> from gen7 onwards.
>
> Fixes: 237ed86c693d ("drm/i915: Check live status before reading edid")
> Cc: stable@xxxxxxxxxxxxxxx # v4.4
>
> V2: restrict faking live_status to certain platforms
> V3: (Ville)
> - keep the debug message for !live_status case
> - fix indentation of comment
> - remove "warning" from the debug message
>
> (Jani)
> - Change format of fix details in the commit message
>
> Suggested-by: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index b199ede..2cdab73 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1412,8 +1412,16 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
> hdmi_to_dig_port(intel_hdmi));
> }
>
> - if (!live_status)
> - DRM_DEBUG_KMS("Live status not up!");
> + if (!live_status) {
> + DRM_DEBUG_KMS("HDMI live status down\n");
> + /*
> + * Live status register is not reliable on all intel platforms.
> + * So consider live_status only for certain platforms, for
> + * others, read EDID to determine presence of sink.
> + */
> + if (INTEL_INFO(dev_priv)->gen < 7 || IS_IVYBRIDGE(dev_priv))
> + live_status = true;
> + }
>
> intel_hdmi_unset_edid(connector);
>
> --
> 1.9.1
--
Ville Syrjälä
Intel OTC
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