[Intel-gfx] [V7 4/9] drm/i915/dsi: Add check for periodic command mode

[Jani Nikula]

On Mon, 03 Feb 2020, Vandita Kulkarni <vandita.kulkarni at intel.com> wrote:
> If the GOP has programmed periodic command mode,
> we need to disable that which would need a
> deconfigure and configure sequence.
>
> v2: Fix sparse error, pass only intel_dsi (Jani)
>
> Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
> Reviewed-by: Jani Nikula <jani.nikula at intel.com>
> ---
>  drivers/gpu/drm/i915/display/icl_dsi.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
> index 04df45d627b2..776d9feb8481 100644
> --- a/drivers/gpu/drm/i915/display/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/display/icl_dsi.c
> @@ -1419,6 +1419,22 @@ static void gen11_dsi_get_timings(struct intel_encoder *encoder,
>  	adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
>  }
>  
> +static bool gen11_dsi_is_periodic_cmd_mode(struct intel_dsi *intel_dsi)
> +{
> +	struct drm_device *dev = intel_dsi->base.base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	enum transcoder dsi_trans;
> +	u32 val;
> +
> +	if (intel_dsi->ports == BIT(PORT_B))
> +		dsi_trans = TRANSCODER_DSI_1;
> +	else
> +		dsi_trans = TRANSCODER_DSI_0;
> +
> +	val = I915_READ(DSI_TRANS_FUNC_CONF(dsi_trans));

intel_de_read().

> +	return (val & DSI_PERIODIC_FRAME_UPDATE_ENABLE);
> +}
> +
>  static void gen11_dsi_get_config(struct intel_encoder *encoder,
>  				 struct intel_crtc_state *pipe_config)
>  {
> @@ -1439,6 +1455,10 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
>  	gen11_dsi_get_timings(encoder, pipe_config);
>  	pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
>  	pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);
> +
> +	if (gen11_dsi_is_periodic_cmd_mode(intel_dsi))
> +		pipe_config->hw.adjusted_mode.private_flags |=
> +					I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
>  }
>  
>  static int gen11_dsi_dsc_compute_config(struct intel_encoder *encoder,
> @@ -1522,6 +1542,10 @@ static int gen11_dsi_compute_config(struct intel_encoder *encoder,
>  
>  	pipe_config->port_clock = afe_clk(encoder, pipe_config) / 5;
>  
> +	/* We would not operate in periodic command mode */
> +	pipe_config->hw.adjusted_mode.private_flags &=
> +					~I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
> +
>  	return 0;
>  }

-- 
Jani Nikula, Intel Open Source Graphics Center