Re: [PATCH v2 10/14] drm/i915: prepare scaler for YCBCR420 modeset

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Jul 13, 2017 at 09:03:16PM +0530, Shashank Sharma wrote:
> To get a YCBCR420 output from intel platforms, we need one
> scaler to scale down YCBCR444 samples to YCBCR420 samples.
> 
> This patch:
> - Does scaler allocation for HDMI ycbcr420 outputs.
> - Programs PIPE_MISC register for ycbcr420 output.
> - Adds a new scaler user "HDMI output" to plug-into existing
>   scaler framework. This output type is identified using bit
>   30 of the scaler users bitmap.
> 
> V2: rebase
> V3: rebase
> V4: rebase
> V5: addressed review comments from Ander:
>     - No need to check both scaler_user && hdmi_output.
>       Check for scaler_user is enough.
> V6: rebase
> V7: Do not create a new scaler user, use existing pipe scaler user.
> 
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Ander Conselvan De Oliveira <conselvan2@gmail.com>
> 
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |  3 +++
>  drivers/gpu/drm/i915/intel_drv.h     |  4 +++-
>  drivers/gpu/drm/i915/intel_hdmi.c    | 12 ++++++++++++
>  drivers/gpu/drm/i915/intel_panel.c   |  3 ++-
>  4 files changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a5140e4..d78f1c2 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -4624,6 +4624,9 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
>  	 */
>  	need_scaling = src_w != dst_w || src_h != dst_h;
>  
> +	if (crtc_state->ycbcr420 && scaler_user == SKL_CRTC_INDEX)
> +		need_scaling = true;
> +
>  	/*
>  	 * Scaling/fitting not supported in IF-ID mode in GEN9+
>  	 * TODO: Interlace fetch mode doesn't support YUV420 planar formats.
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 592243b..94ea6ed 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -471,7 +471,8 @@ struct intel_crtc_scaler_state {
>  	 *
>  	 *     If a bit is set, a user is using a scaler.
>  	 *     Here user can be a plane or crtc as defined below:
> -	 *       bits 0-30 - plane (bit position is index from drm_plane_index)
> +	 *       bits 0-29 - plane (bit position is index from drm_plane_index)
> +	 *       bit 30    - hdmi output

That's no longer true.

>  	 *       bit 31    - crtc
>  	 *
>  	 * Instead of creating a new index to cover planes and crtc, using
> @@ -484,6 +485,7 @@ struct intel_crtc_scaler_state {
>  	 * avilability.
>  	 */
>  #define SKL_CRTC_INDEX 31
> +

Bogus whitespace change.

>  	unsigned scaler_users;
>  
>  	/* scaler used by crtc for panel fitting purpose */
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index eb6243c..49f4fb8 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1356,6 +1356,7 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
>  			       struct intel_crtc_state *config,
>  			       int *clock_12bpc, int *clock_8bpc)
>  {
> +	struct intel_crtc *intel_crtc = to_intel_crtc(config->base.crtc);
>  
>  	if (!connector->ycbcr_420_allowed) {
>  		DRM_ERROR("Platform doesn't support YCBCR420 output\n");
> @@ -1367,6 +1368,17 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
>  	*clock_12bpc /= 2;
>  	*clock_8bpc /= 2;
>  	config->ycbcr420 = true;
> +
> +	/* YCBCR 420 output conversion needs a scaler */
> +	if (skl_update_scaler_crtc(config)) {
> +		DRM_ERROR("Scaler allocation for output failed\n");

DRM_DEBUG_KMS

> +		return false;
> +	}
> +
> +	/* Bind this scaler to pipe */

Unnecesary comment.

> +	intel_pch_panel_fitting(intel_crtc, config,
> +				DRM_MODE_SCALE_FULLSCREEN);
> +
>  	return true;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index 96c2cbd..fd2e081 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -110,7 +110,8 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
>  
>  	/* Native modes don't need fitting */
>  	if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
> -	    adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
> +	    adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
> +	    !pipe_config->ycbcr420)
>  		goto done;
>  
>  	switch (fitting_mode) {
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel OTC
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