[Intel-gfx] [PATCH 7/9] drm/i915/bxt: Disable device ready before shutdown command

[Bob Paauwe]

On Wed, 8 Feb 2017 16:20:56 +0530
Vidya Srinivas <vidya.srinivas at intel.com> wrote:

> From: Uma Shankar <uma.shankar at intel.com>
> 
> Disable device ready before MIPI port shutdown command.
> This helps to avoid mipi split screen issues.
> 
> Signed-off-by: Uma Shankar <uma.shankar at intel.com>
> Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com>

Reviewed-by: Bob Paauwe <bob.j.paauwe at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dsi.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 808158f..12aeee1 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -603,6 +603,8 @@ static void intel_dsi_pre_disable(struct intel_encoder *encoder,
>  				  struct intel_crtc_state *old_crtc_state,
>  				  struct drm_connector_state *old_conn_state)
>  {
> +	struct drm_device *dev = encoder->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
>  	enum port port;
>  
> @@ -610,6 +612,15 @@ static void intel_dsi_pre_disable(struct intel_encoder *encoder,
>  
>  	intel_panel_disable_backlight(intel_dsi->attached_connector);
>  
> +	/*
> +	 * Disable Device ready before the port shutdown in order
> +	 * to avoid split screen
> +	 */
> +	if (IS_BROXTON(dev_priv)) {
> +		for_each_dsi_port(port, intel_dsi->ports)
> +			I915_WRITE(MIPI_DEVICE_READY(port), 0);
> +	}
> +
>  	if (is_vid_mode(intel_dsi)) {
>  		/* Send Shutdown command to the panel in LP mode */
>  		for_each_dsi_port(port, intel_dsi->ports)



-- 
--
Bob Paauwe                  
Bob.J.Paauwe at intel.com
IOTG / PED Software Organization
Intel Corp.  Folsom, CA
(916) 356-6193