Re: [RFC 6/6] drm/i915/dp: Update pipe_bpp for DP YCbCr4:2:0 outputs

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Op 31-01-2019 om 22:10 schreef Gwan-gyeong Mun:
> pipe_bpp value was assumed RGB therefore it was multiplied with 3.
> But YCbCr 4:2:0 requires multiplier value to 1.5 therefore it divides
> pipe_bpp to 2.
>  - RGB bpp = bpc x 3
>  - YCbCr 4:2:0 bpp = bpc x 1.5
>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c |  7 +++++-
>  drivers/gpu/drm/i915/intel_dp.c  | 41 ++++++++++++++++++++++++++------
>  2 files changed, 40 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index c6aed2b06a59..7f56aa7842c1 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1696,6 +1696,7 @@ void intel_ddi_set_pipe_settings(const struct intel_crtc_state *crtc_state)
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>  	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
>  	u32 temp;
> +	int bpp;
>  
>  	if (!intel_crtc_has_dp_encoder(crtc_state))
>  		return;
> @@ -1707,7 +1708,11 @@ void intel_ddi_set_pipe_settings(const struct intel_crtc_state *crtc_state)
>  	if (crtc_state->limited_color_range)
>  		temp |= TRANS_MSA_CEA_RANGE;
>  
> -	switch (crtc_state->pipe_bpp) {
> +	bpp = crtc_state->pipe_bpp;
> +	if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
> +		bpp *= 2;
> +
> +	switch (bpp) {
>  	case 18:
>  		temp |= TRANS_MSA_6_BPC;
>  		break;
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 3a9a5a3c33a9..734c5743e03f 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1761,12 +1761,13 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>  	struct intel_connector *intel_connector = intel_dp->attached_connector;
>  	int bpp, bpc;
> +	int bpp_divider = pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ? 2 : 1;
>  
>  	bpp = pipe_config->pipe_bpp;
>  	bpc = drm_dp_downstream_max_bpc(intel_dp->dpcd, intel_dp->downstream_ports);
>  
>  	if (bpc > 0)
> -		bpp = min(bpp, 3*bpc);
> +		bpp = min(bpp, 3*bpc/bpp_divider);
>  
>  	if (intel_dp_is_edp(intel_dp)) {
>  		/* Get bpp from vbt only for panels that dont have bpp in edid */
> @@ -1787,12 +1788,14 @@ intel_dp_adjust_compliance_config(struct intel_dp *intel_dp,
>  				  struct intel_crtc_state *pipe_config,
>  				  struct link_config_limits *limits)
>  {
> +	int bpp_divider = pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ? 2 : 1;
> +
>  	/* For DP Compliance we override the computed bpp for the pipe */
>  	if (intel_dp->compliance.test_data.bpc != 0) {
> -		int bpp = 3 * intel_dp->compliance.test_data.bpc;
> +		int bpp = 3 * intel_dp->compliance.test_data.bpc / bpp_divider;
>  
>  		limits->min_bpp = limits->max_bpp = bpp;
> -		pipe_config->dither_force_disable = bpp == 6 * 3;
> +		pipe_config->dither_force_disable = bpp == 6 * 3 / bpp_divider;
>  
>  		DRM_DEBUG_KMS("Setting pipe_bpp to %d\n", bpp);
>  	}
> @@ -1826,8 +1829,9 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
>  	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
>  	int bpp, clock, lane_count;
>  	int mode_rate, link_clock, link_avail;
> +	int bpp_divider = pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ? 2 : 1;
>  
> -	for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
> +	for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3 / bpp_divider) {
>  		mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
>  						   bpp);
>  
> @@ -1862,8 +1866,9 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
>  	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
>  	int bpp, clock, lane_count;
>  	int mode_rate, link_clock, link_avail;
> +	int bpp_divider = pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ? 2 : 1;
>  
> -	for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
> +	for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3 / bpp_divider) {
>  		mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
>  						   bpp);
>  
> @@ -2009,6 +2014,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
>  	struct link_config_limits limits;
>  	int common_len;
>  	int ret;
> +	int bpp_divider = pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ? 2 : 1;
>  
>  	common_len = intel_dp_common_len_rate_limit(intel_dp,
>  						    intel_dp->max_link_rate);
> @@ -2022,7 +2028,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
>  	limits.min_lane_count = 1;
>  	limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
>  
> -	limits.min_bpp = 6 * 3;
> +	limits.min_bpp = 6 * 3 / bpp_divider;
>  	limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
>  
>  	if (intel_dp_is_edp(intel_dp) && intel_dp->edp_dpcd[0] < DP_EDP_14) {
> @@ -2110,6 +2116,11 @@ intel_dp_ycbcr420_config(struct drm_connector *connector,
>  	}
>  
>  	config->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
> +	/* pipe_bpp value was assumed RGB therefore it was multiplied
> +	 * with 3. But YCbCr 4:2:0 requires multiplier value to 1.5
> +	 * therefore it divides pipe_bpp to 2.
> +	 */
> +	config->pipe_bpp /= 2;
>  
>  	/* YCBCR 420 output conversion needs a scaler */
>  	if (skl_update_scaler_crtc(config)) {
> @@ -4446,7 +4457,23 @@ intel_pixel_encoding_setup_vsc(struct intel_dp *intel_dp,
>  	 * 011b = 12bpc.
>  	 * 100b = 16bpc.
>  	 */
> -	vsc_sdp.DB17 = 0x1;
> +	switch (crtc_state->pipe_bpp) {
> +	case 12: /* 8bpc */
> +		vsc_sdp.DB17 = 0x1;
> +		break;
> +	case 15: /* 10bpc */
> +		vsc_sdp.DB17 = 0x2;
> +		break;
> +	case 18: /* 12bpc */
> +		vsc_sdp.DB17 = 0x3;
> +		break;
> +	case 24: /* 16bpc */
> +		vsc_sdp.DB17 = 0x4;
> +		break;
> +	default:
> +		DRM_DEBUG_KMS("Invalid bpp value '%d'\n", crtc_state->pipe_bpp);
> +		break;
> +	}
>  
>  	/*
>  	 * Content Type (Bits 2:0)

For patch 2, 3, 5, and 6:

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

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