> -----Original Message-----
> From: Intel-gfx <intel-gfx-boun...@lists.freedesktop.org> On Behalf Of Ville
> Syrjala
> Sent: Tuesday, March 22, 2022 5:30 PM
> To: intel-gfx@lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH v2 10/12] drm/i915/dp: Duplicate native HDMI TMDS
> clock limit handling for DP HDMI DFPs
>
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> With native HDMI we allow the user to override the mode with something that
> may
> not respect the downstream (sink,dual-mode adapter) TMDS clock limits. Let's
> reuse
> the same logic for DP HDMI DFPs so that behaviour is more or less uniform.
Looks Good to me.
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 51 ++++++++++++++++++-------
> 1 file changed, 38 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index 3dbb68fa4e51..053853a3054e 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -870,10 +870,14 @@ static int intel_dp_max_tmds_clock(struct intel_dp
> *intel_dp)
>
> static enum drm_mode_status
> intel_dp_tmds_clock_valid(struct intel_dp *intel_dp,
> - int clock, int bpc, bool ycbcr420_output)
> + int clock, int bpc, bool ycbcr420_output,
> + bool respect_downstream_limits)
> {
> int tmds_clock, min_tmds_clock, max_tmds_clock;
>
> + if (!respect_downstream_limits)
> + return MODE_OK;
> +
> tmds_clock = intel_hdmi_tmds_clock(clock, bpc, ycbcr420_output);
>
> min_tmds_clock = intel_dp->dfp.min_tmds_clock; @@ -925,7 +929,7 @@
> intel_dp_mode_valid_downstream(struct intel_connector *connector,
>
> /* Assume 8bpc for the DP++/HDMI/DVI TMDS clock check */
> status = intel_dp_tmds_clock_valid(intel_dp, target_clock,
> - 8, ycbcr_420_only);
> + 8, ycbcr_420_only, true);
>
> if (status != MODE_OK) {
> if (ycbcr_420_only ||
> @@ -934,7 +938,7 @@ intel_dp_mode_valid_downstream(struct intel_connector
> *connector,
> return status;
>
> status = intel_dp_tmds_clock_valid(intel_dp, target_clock,
> - 8, true);
> + 8, true, true);
> if (status != MODE_OK)
> return status;
> }
> @@ -1183,7 +1187,7 @@ static bool intel_dp_is_ycbcr420(struct intel_dp
> *intel_dp,
>
> static int intel_dp_hdmi_compute_bpc(struct intel_dp *intel_dp,
> const struct intel_crtc_state *crtc_state,
> - int bpc)
> + int bpc, bool respect_downstream_limits)
> {
> bool ycbcr420_output = intel_dp_is_ycbcr420(intel_dp, crtc_state);
> int clock = crtc_state->hw.adjusted_mode.crtc_clock;
> @@ -1195,10 +1199,19 @@ static int intel_dp_hdmi_compute_bpc(struct intel_dp
> *intel_dp,
> */
> bpc = max(bpc, 8);
>
> + /*
> + * We will never exceed downstream TMDS clock limits while
> + * attempting deep color. If the user insists on forcing an
> + * out of spec mode they will have to be satisfied with 8bpc.
> + */
> + if (!respect_downstream_limits)
> + bpc = 8;
> +
> for (; bpc >= 8; bpc -= 2) {
> if (intel_hdmi_bpc_possible(crtc_state, bpc,
> intel_dp->has_hdmi_sink,
> ycbcr420_output) &&
> - intel_dp_tmds_clock_valid(intel_dp, clock, bpc,
> ycbcr420_output)
> == MODE_OK)
> + intel_dp_tmds_clock_valid(intel_dp, clock, bpc,
> ycbcr420_output,
> + respect_downstream_limits) ==
> MODE_OK)
> return bpc;
> }
>
> @@ -1206,7 +1219,8 @@ static int intel_dp_hdmi_compute_bpc(struct intel_dp
> *intel_dp, }
>
> static int intel_dp_max_bpp(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state)
> + const struct intel_crtc_state *crtc_state,
> + bool respect_downstream_limits)
> {
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> struct intel_connector *intel_connector = intel_dp->attached_connector;
> @@ -1220,7 +1234,8 @@ static int intel_dp_max_bpp(struct intel_dp *intel_dp,
> if (intel_dp->dfp.min_tmds_clock) {
> int max_hdmi_bpc;
>
> - max_hdmi_bpc = intel_dp_hdmi_compute_bpc(intel_dp, crtc_state,
> bpc);
> + max_hdmi_bpc = intel_dp_hdmi_compute_bpc(intel_dp, crtc_state,
> bpc,
> +
> respect_downstream_limits);
> if (max_hdmi_bpc < 0)
> return 0;
>
> @@ -1539,7 +1554,8 @@ static int intel_dp_dsc_compute_config(struct intel_dp
> *intel_dp, static int intel_dp_compute_link_config(struct intel_encoder
> *encoder,
> struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> + struct drm_connector_state *conn_state,
> + bool respect_downstream_limits)
> {
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
> @@ -1556,7 +1572,7 @@ intel_dp_compute_link_config(struct intel_encoder
> *encoder,
> limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
>
> limits.min_bpp = intel_dp_min_bpp(pipe_config->output_format);
> - limits.max_bpp = intel_dp_max_bpp(intel_dp, pipe_config);
> + limits.max_bpp = intel_dp_max_bpp(intel_dp, pipe_config,
> +respect_downstream_limits);
>
> if (intel_dp->use_max_params) {
> /*
> @@ -1850,7 +1866,8 @@ static bool intel_dp_has_audio(struct intel_encoder
> *encoder, static int intel_dp_compute_output_format(struct intel_encoder
> *encoder,
> struct intel_crtc_state *crtc_state,
> - struct drm_connector_state *conn_state)
> + struct drm_connector_state *conn_state,
> + bool respect_downstream_limits)
> {
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> struct intel_dp *intel_dp = enc_to_intel_dp(encoder); @@ -1870,7 +1887,8
> @@ intel_dp_compute_output_format(struct intel_encoder *encoder,
> crtc_state->output_format = INTEL_OUTPUT_FORMAT_RGB;
> }
>
> - ret = intel_dp_compute_link_config(encoder, crtc_state, conn_state);
> + ret = intel_dp_compute_link_config(encoder, crtc_state, conn_state,
> + respect_downstream_limits);
> if (ret) {
> if (intel_dp_is_ycbcr420(intel_dp, crtc_state) ||
> !connector->base.ycbcr_420_allowed || @@ -1878,7 +1896,8
> @@ intel_dp_compute_output_format(struct intel_encoder *encoder,
> return ret;
>
> crtc_state->output_format = intel_dp_output_format(connector,
> true);
> - ret = intel_dp_compute_link_config(encoder, crtc_state,
> conn_state);
> + ret = intel_dp_compute_link_config(encoder, crtc_state,
> conn_state,
> + respect_downstream_limits);
> }
>
> return ret;
> @@ -1922,7 +1941,13 @@ intel_dp_compute_config(struct intel_encoder
> *encoder,
> if (intel_dp_hdisplay_bad(dev_priv, adjusted_mode->crtc_hdisplay))
> return -EINVAL;
>
> - ret = intel_dp_compute_output_format(encoder, pipe_config, conn_state);
> + /*
> + * Try to respect downstream TMDS clock limits first, if
> + * that fails assume the user might know something we don't.
> + */
> + ret = intel_dp_compute_output_format(encoder, pipe_config, conn_state,
> true);
> + if (ret)
> + ret = intel_dp_compute_output_format(encoder, pipe_config,
> +conn_state, false);
> if (ret)
> return ret;
>
> --
> 2.34.1
