On Mon, May 21, 2018 at 05:25:51PM -0700, Paulo Zanoni wrote:
> From: "Sripada, Radhakrishna" <radhakrishna.srip...@intel.com>
>
> Starting Icelake silicon supports 10-bpc hdmi to support certain
> media workloads. Currently hdmi supports 8 and 12 bpc. Plumbed
> in support for 10 bit hdmi.
>
> Cc: James Ausmus <james.aus...@intel.com>
> Cc: Jani Nikula <jani.nik...@linux.intel.com>
> Cc: Paulo Zanoni <paulo.r.zan...@intel.com>
> Cc: Manasi Navare <manasi.d.nav...@intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.srip...@intel.com>
Still looks reasoanble to me so
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 64
> +++++++++++++++++++++++++++++----------
> 1 file changed, 48 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> b/drivers/gpu/drm/i915/intel_hdmi.c
> index 0ca4cc877520..53ac8bb85218 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1561,14 +1561,23 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
> /* check if we can do 8bpc */
> status = hdmi_port_clock_valid(hdmi, clock, true, force_dvi);
>
> - /* if we can't do 8bpc we may still be able to do 12bpc */
> - if (!HAS_GMCH_DISPLAY(dev_priv) && status != MODE_OK &&
> hdmi->has_hdmi_sink && !force_dvi)
> - status = hdmi_port_clock_valid(hdmi, clock * 3 / 2, true,
> force_dvi);
> + if (hdmi->has_hdmi_sink && !force_dvi) {
> + /* if we can't do 8bpc we may still be able to do 12bpc */
> + if (status != MODE_OK && !HAS_GMCH_DISPLAY(dev_priv))
> + status = hdmi_port_clock_valid(hdmi, clock * 3 / 2,
> + true, force_dvi);
> +
> + /* if we can't do 8,12bpc we may still be able to do 10bpc */
> + if (status != MODE_OK && INTEL_GEN(dev_priv) >= 11)
> + status = hdmi_port_clock_valid(hdmi, clock * 5 / 4,
> + true, force_dvi);
> + }
>
> return status;
> }
>
> -static bool hdmi_12bpc_possible(const struct intel_crtc_state *crtc_state)
> +static bool hdmi_deep_color_possible(const struct intel_crtc_state
> *crtc_state,
> + int bpc)
> {
> struct drm_i915_private *dev_priv =
> to_i915(crtc_state->base.crtc->dev);
> @@ -1580,6 +1589,9 @@ static bool hdmi_12bpc_possible(const struct
> intel_crtc_state *crtc_state)
> if (HAS_GMCH_DISPLAY(dev_priv))
> return false;
>
> + if (bpc == 10 && INTEL_GEN(dev_priv) < 11)
> + return false;
> +
> if (crtc_state->pipe_bpp <= 8*3)
> return false;
>
> @@ -1587,7 +1599,7 @@ static bool hdmi_12bpc_possible(const struct
> intel_crtc_state *crtc_state)
> return false;
>
> /*
> - * HDMI 12bpc affects the clocks, so it's only possible
> + * HDMI deep color affects the clocks, so it's only possible
> * when not cloning with other encoder types.
> */
> if (crtc_state->output_types != 1 << INTEL_OUTPUT_HDMI)
> @@ -1602,16 +1614,24 @@ static bool hdmi_12bpc_possible(const struct
> intel_crtc_state *crtc_state)
> if (crtc_state->ycbcr420) {
> const struct drm_hdmi_info *hdmi = &info->hdmi;
>
> - if (!(hdmi->y420_dc_modes & DRM_EDID_YCBCR420_DC_36))
> + if (bpc == 12 && !(hdmi->y420_dc_modes &
> + DRM_EDID_YCBCR420_DC_36))
> + return false;
> + else if (bpc == 10 && !(hdmi->y420_dc_modes &
> + DRM_EDID_YCBCR420_DC_30))
> return false;
> } else {
> - if (!(info->edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_36))
> + if (bpc == 12 && !(info->edid_hdmi_dc_modes &
> + DRM_EDID_HDMI_DC_36))
> + return false;
> + else if (bpc == 10 && !(info->edid_hdmi_dc_modes &
> + DRM_EDID_HDMI_DC_30))
> return false;
> }
> }
>
> /* Display WA #1139: glk */
> - if (IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1) &&
> + if (bpc == 12 && IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1) &&
> crtc_state->base.adjusted_mode.htotal > 5460)
> return false;
>
> @@ -1621,7 +1641,8 @@ static bool hdmi_12bpc_possible(const struct
> intel_crtc_state *crtc_state)
> static bool
> intel_hdmi_ycbcr420_config(struct drm_connector *connector,
> struct intel_crtc_state *config,
> - int *clock_12bpc, int *clock_8bpc)
> + int *clock_12bpc, int *clock_10bpc,
> + int *clock_8bpc)
> {
> struct intel_crtc *intel_crtc = to_intel_crtc(config->base.crtc);
>
> @@ -1633,6 +1654,7 @@ intel_hdmi_ycbcr420_config(struct drm_connector
> *connector,
> /* YCBCR420 TMDS rate requirement is half the pixel clock */
> config->port_clock /= 2;
> *clock_12bpc /= 2;
> + *clock_10bpc /= 2;
> *clock_8bpc /= 2;
> config->ycbcr420 = true;
>
> @@ -1660,6 +1682,7 @@ bool intel_hdmi_compute_config(struct intel_encoder
> *encoder,
> struct intel_digital_connector_state *intel_conn_state =
> to_intel_digital_connector_state(conn_state);
> int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
> + int clock_10bpc = clock_8bpc * 5 / 4;
> int clock_12bpc = clock_8bpc * 3 / 2;
> int desired_bpp;
> bool force_dvi = intel_conn_state->force_audio == HDMI_AUDIO_OFF_DVI;
> @@ -1683,12 +1706,14 @@ bool intel_hdmi_compute_config(struct intel_encoder
> *encoder,
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) {
> pipe_config->pixel_multiplier = 2;
> clock_8bpc *= 2;
> + clock_10bpc *= 2;
> clock_12bpc *= 2;
> }
>
> if (drm_mode_is_420_only(&connector->display_info, adjusted_mode)) {
> if (!intel_hdmi_ycbcr420_config(connector, pipe_config,
> - &clock_12bpc, &clock_8bpc)) {
> + &clock_12bpc, &clock_10bpc,
> + &clock_8bpc)) {
> DRM_ERROR("Can't support YCBCR420 output\n");
> return false;
> }
> @@ -1706,18 +1731,25 @@ bool intel_hdmi_compute_config(struct intel_encoder
> *encoder,
> }
>
> /*
> - * HDMI is either 12 or 8, so if the display lets 10bpc sneak
> - * through, clamp it down. Note that g4x/vlv don't support 12bpc hdmi
> - * outputs. We also need to check that the higher clock still fits
> - * within limits.
> + * Note that g4x/vlv don't support 12bpc hdmi outputs. We also need
> + * to check that the higher clock still fits within limits.
> */
> - if (hdmi_12bpc_possible(pipe_config) &&
> - hdmi_port_clock_valid(intel_hdmi, clock_12bpc, true, force_dvi) ==
> MODE_OK) {
> + if (hdmi_deep_color_possible(pipe_config, 12) &&
> + hdmi_port_clock_valid(intel_hdmi, clock_12bpc,
> + true, force_dvi) == MODE_OK) {
> DRM_DEBUG_KMS("picking bpc to 12 for HDMI output\n");
> desired_bpp = 12*3;
>
> /* Need to adjust the port link by 1.5x for 12bpc. */
> pipe_config->port_clock = clock_12bpc;
> + } else if (hdmi_deep_color_possible(pipe_config, 10) &&
> + hdmi_port_clock_valid(intel_hdmi, clock_10bpc,
> + true, force_dvi) == MODE_OK) {
> + DRM_DEBUG_KMS("picking bpc to 10 for HDMI output\n");
> + desired_bpp = 10 * 3;
> +
> + /* Need to adjust the port link by 1.25x for 10bpc. */
> + pipe_config->port_clock = clock_10bpc;
> } else {
> DRM_DEBUG_KMS("picking bpc to 8 for HDMI output\n");
> desired_bpp = 8*3;
> --
> 2.14.3
--
Ville Syrjälä
Intel
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