[PATCH 18/20] drm/i915: YCBCR 420 support for LSPCON
Ville Syrjälä
ville.syrjala at linux.intel.com
Wed Jul 12 17:15:42 UTC 2017
On Mon, Jul 10, 2017 at 04:48:46PM +0530, Shashank Sharma wrote:
> LSPCON chips support YCBCR420 outputs. To be able to get
> YCBCR420 output from LSPCON chip, the source should:
> - Generate YCBCR444 HDMI output
> - Set AVI infoframes for a YCBCR420 output.
>
> LSPCON FW gets the information from AVI infoframes, and generates
> YCBCR420 output from a YCBCR444 input. This patch adds the necessary
> changes to drive YCBCR420 output from LSPCON based HDMI output.
>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Imre Deak <imre.deak at intel.com>
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 10 +++++++---
> drivers/gpu/drm/i915/intel_dp.c | 16 +++++++++++++++-
> drivers/gpu/drm/i915/intel_drv.h | 20 +++++++++++++++++---
> drivers/gpu/drm/i915/intel_hdmi.c | 7 +++++--
> drivers/gpu/drm/i915/intel_lspcon.c | 17 +++++++++++++++++
> 5 files changed, 61 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index c5ff568..c3c7b31 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8125,9 +8125,11 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
> val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
>
> if (config->ycbcr420) {
> - val |= PIPEMISC_OUTPUT_YCBCR |
> - PIPEMISC_YCBCR420_ENABLE |
> - PIPEMISC_YCBCR420_MODE_BLEND;
> + val |= PIPEMISC_OUTPUT_YCBCR;
> +
> + if (!config->lspcon_active)
> + val |= PIPEMISC_YCBCR420_ENABLE |
> + PIPEMISC_YCBCR420_MODE_BLEND;
> }
>
> I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
> @@ -14205,11 +14207,13 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
> * DDI_BUF_CTL_A or SFUSE_STRAP registers, find another way to
> * detect the ports.
> */
> +
> intel_ddi_init(dev_priv, PORT_A);
> intel_ddi_init(dev_priv, PORT_B);
> intel_ddi_init(dev_priv, PORT_C);
>
> intel_dsi_init(dev_priv);
> +
> } else if (HAS_DDI(dev_priv)) {
> int found;
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 67bc8a7a..1690aa9 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1614,7 +1614,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> - enum port port = dp_to_dig_port(intel_dp)->port;
> + struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
> + enum port port = dig_port->port;
> + struct intel_lspcon *lspcon = &dig_port->lspcon;
> struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
> struct intel_connector *intel_connector = intel_dp->attached_connector;
> struct intel_digital_connector_state *intel_conn_state =
> @@ -1635,6 +1637,18 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> common_len = intel_dp_common_len_rate_limit(intel_dp,
> intel_dp->max_link_rate);
>
> + /* LSPCON needs special handling to drive YCBCR420 outputs */
> + if (lspcon->active) {
> + struct drm_connector *connector = &intel_connector->base;
> + int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
> + int clock_12bpc = clock_8bpc * 3 / 2;
> +
> + pipe_config->lspcon_active = true;
> + pipe_config->ycbcr420 = lspcon_ycbcr420_config(connector,
> + pipe_config, &clock_12bpc,
> + &clock_8bpc);
All this clock stuff here seems pointless. So I'd just replace this
stuff with the straightforward 'pipe_config->ycbcr420 = mode_needs_420';
> + }
> +
> /* No common link rates between source and sink */
> WARN_ON(common_len <= 0);
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index ed04de9..40d56f2 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -790,6 +790,9 @@ struct intel_crtc_state {
>
> /* HDMI output type */
> bool ycbcr420;
> +
> + /* LSPCON is active on port */
> + bool lspcon_active;
> };
>
> struct intel_crtc {
> @@ -1205,6 +1208,12 @@ static inline struct intel_dp *enc_to_intel_dp(struct drm_encoder *encoder)
> return &enc_to_dig_port(encoder)->dp;
> }
>
> +static inline struct intel_lspcon *
> +enc_to_intel_lspcon(struct drm_encoder *encoder)
> +{
> + return &enc_to_dig_port(encoder)->lspcon;
> +}
> +
> static inline struct intel_digital_port *
> dp_to_dig_port(struct intel_dp *intel_dp)
> {
> @@ -1675,14 +1684,16 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> struct intel_connector *intel_connector);
> struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder);
> bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state);
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state);
> void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
> struct drm_connector *connector,
> bool high_tmds_clock_ratio,
> bool scrambling);
> void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
> -
> +bool intel_hdmi_ycbcr420_config(struct drm_connector *connector,
> + struct intel_crtc_state *config,
> + int *clock_12bpc, int *clock_8bpc);
>
> /* intel_lvds.c */
> void intel_lvds_init(struct drm_i915_private *dev_priv);
> @@ -2003,6 +2014,9 @@ void intel_color_load_luts(struct drm_crtc_state *crtc_state);
> bool lspcon_init(struct intel_digital_port *intel_dig_port);
> void lspcon_resume(struct intel_lspcon *lspcon);
> void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon);
> +bool lspcon_ycbcr420_config(struct drm_connector *connector,
> + struct intel_crtc_state *config,
> + int *clock_12bpc, int *clock_8bpc);
>
> /* intel_pipe_crc.c */
> int intel_pipe_crc_create(struct drm_minor *minor);
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index d1b1efc..a08ab99 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1362,8 +1362,7 @@ static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state,
> return true;
> }
>
> -static bool
> -intel_hdmi_ycbcr420_config(struct drm_connector *connector,
> +bool intel_hdmi_ycbcr420_config(struct drm_connector *connector,
> struct intel_crtc_state *config,
> int *clock_12bpc, int *clock_8bpc)
> {
> @@ -1380,6 +1379,10 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
> *clock_8bpc /= 2;
> config->ycbcr420 = true;
>
> + /* LSPCON doesn't need scaler for YCBCR420 output */
> + if (config->lspcon_active)
> + return true;
> +
> /* YCBCR 420 output conversion needs a scaler */
> if (skl_update_scaler_crtc_420_output(config)) {
> DRM_ERROR("Scaler allocation for output failed\n");
> diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
> index a350d79..f611b6d 100644
> --- a/drivers/gpu/drm/i915/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/intel_lspcon.c
> @@ -202,6 +202,21 @@ static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
> DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
> }
>
> +bool lspcon_ycbcr420_config(struct drm_connector *connector,
> + struct intel_crtc_state *config,
> + int *clock_12bpc, int *clock_8bpc)
> +{
> + struct drm_display_info *info = &connector->display_info;
> + struct drm_display_mode *mode = &config->base.adjusted_mode;
> +
> + if (drm_mode_is_420_only(info, mode)) {
> + return intel_hdmi_ycbcr420_config(connector, config,
> + clock_12bpc, clock_8bpc);
> + }
> +
> + return false;
> +}
> +
> void lspcon_resume(struct intel_lspcon *lspcon)
> {
> enum drm_lspcon_mode expected_mode;
> @@ -233,6 +248,7 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
> struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
> struct drm_device *dev = intel_dig_port->base.base.dev;
> struct drm_i915_private *dev_priv = to_i915(dev);
> + struct drm_connector *connector = &dp->attached_connector->base;
>
> if (!IS_GEN9(dev_priv)) {
> DRM_ERROR("LSPCON is supported on GEN9 only\n");
> @@ -264,6 +280,7 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
> return false;
> }
>
> + connector->ycbcr_420_allowed = true;
> drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd));
>
> DRM_DEBUG_KMS("Success: LSPCON init\n");
> --
> 2.7.4
--
Ville Syrjälä
Intel OTC
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