On Thu, 21 Apr 2016, Shashank Sharma <shashank.sharma@xxxxxxxxx> 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.
>
> This fixes regression added by patch:
> 'commit 237ed86c693d ("drm/i915: Check live status before reading edid")'
Fixes: 237ed86c693d ("drm/i915: Check live status before reading edid")
Cc: stable@xxxxxxxxxxxxxxx # v4.4
>
> V2: restrict faking live_status to certain platforms
>
> Based on suggestion by: Ville Syrjala<ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
> ---
> 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..c2150db 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!");
> + /*
> + * Live status reg is not reliable for all older platforms
> + * So for certain platforms, dont block EDID read even if
> + * live_status is down, give EDID a shot.
> + */
> + if ((INTEL_INFO(dev_priv)->gen < 7 || IS_IVYBRIDGE(dev_priv))
> + && !live_status) {
> + DRM_DEBUG_KMS("Warning: live status not up, faking it\n");
> + live_status = true;
> + }
>
> intel_hdmi_unset_edid(connector);
--
Jani Nikula, Intel Open Source Technology Center
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