On Mon, 2017-04-24 at 13:47 +0300, Ander Conselvan de Oliveira wrote:
> Display workaround #1139 for Geminilake instructs us to restrict HDMI
> to 8 bpc when htotal is greater than 5460. Otherwise, the pipe is unable
> to generate a proper signal and is left in a state where corruption is
> seen with other modes.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100440
> Cc: Shashank Sharma <[email protected]>
> Signed-off-by: Ander Conselvan de Oliveira
> <[email protected]>
Perhaps this should have
Fixes: 14292b7ff86f ("drm/i915: allow HDMI 2.0 clock rates")
since it is only after that patch that the issue would be exposed, even though
is not the cause for it. Jani?
Ander
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> b/drivers/gpu/drm/i915/intel_hdmi.c
> index 6efc3cb..52f0b2d 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1327,6 +1327,11 @@ static bool hdmi_12bpc_possible(struct
> intel_crtc_state *crtc_state)
> return false;
> }
>
> + /* Display Wa #1139 */
> + if (IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1) &&
> + crtc_state->base.adjusted_mode.htotal > 5460)
> + return false;
> +
> return true;
> }
>
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