Re: [PATCH v5 6/9] drm/vc4: hdmi: Store pixel frequency in the connector state

Hi Maxime

On Mon, 7 Dec 2020 at 15:57, Maxime Ripard maxime@cerno.tech wrote:

The pixel rate is for now quite simple to compute, but with more features (30 and 36 bits output, YUV output, etc.) will depend on a bunch of connectors properties.

Let's store the rate we have to run the pixel clock at in our custom connector state, and compute it in atomic_check.

Signed-off-by: Maxime Ripard maxime@cerno.tech

Reviewed-by: Dave Stevenson dave.stevenson@raspberrypi.com

---

drivers/gpu/drm/vc4/vc4_hdmi.c | 26 +++++++++++++++++++++++++- drivers/gpu/drm/vc4/vc4_hdmi.h | 1 + 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 744396c8dcb9..83699105c7a5 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -194,6 +194,7 @@ vc4_hdmi_connector_duplicate_state(struct drm_connector *connector) if (!new_state) return NULL;

•   new_state->pixel_rate = vc4_state->pixel_rate;
    __drm_atomic_helper_connector_duplicate_state(connector, &new_state->base);
  
    return &new_state->base;
  

@@ -611,9 +612,29 @@ static void vc4_hdmi_recenter_fifo(struct vc4_hdmi *vc4_hdmi) "VC4_HDMI_FIFO_CTL_RECENTER_DONE"); }

+static struct drm_connector_state * +vc4_hdmi_encoder_get_connector_state(struct drm_encoder *encoder,

•                                struct drm_atomic_state *state)
  

+{

•   struct drm_connector_state *conn_state;
  

•   struct drm_connector *connector;
  

•   unsigned int i;
  

•   for_each_new_connector_in_state(state, connector, conn_state, i) {
  

•           if (conn_state->best_encoder == encoder)
  

•                   return conn_state;
  

•   }
  

•   return NULL;
  

+}

static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder, struct drm_atomic_state *state) {

•   struct drm_connector_state *conn_state =
  

•           vc4_hdmi_encoder_get_connector_state(encoder, state);
  

•   struct vc4_hdmi_connector_state *vc4_conn_state =
  

•           conn_state_to_vc4_hdmi_conn_state(conn_state);
    struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
    struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
    unsigned long pixel_rate, hsm_rate;
  

@@ -625,7 +646,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder, return; }

•   pixel_rate = mode->clock * 1000 * ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1);
  

•   pixel_rate = vc4_conn_state->pixel_rate;
    ret = clk_set_rate(vc4_hdmi->pixel_clock, pixel_rate);
    if (ret) {
            DRM_ERROR("Failed to set pixel clock rate: %d\n", ret);
  

@@ -797,6 +818,7 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder, struct drm_crtc_state *crtc_state, struct drm_connector_state *conn_state) {

•   struct vc4_hdmi_connector_state *vc4_state = conn_state_to_vc4_hdmi_conn_state(conn_state);
    struct drm_display_mode *mode = &crtc_state->adjusted_mode;
    struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
    unsigned long long pixel_rate = mode->clock * 1000;
  

@@ -827,6 +849,8 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder, if (pixel_rate > vc4_hdmi->variant->max_pixel_clock) return -EINVAL;

•   vc4_state->pixel_rate = pixel_rate;
  

•   return 0;
  

}

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h index 2cf5362052e2..bca6943de884 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h @@ -182,6 +182,7 @@ encoder_to_vc4_hdmi(struct drm_encoder *encoder)

struct vc4_hdmi_connector_state { struct drm_connector_state base;

•   unsigned long long              pixel_rate;
  

};

static inline struct vc4_hdmi_connector_state *

2.28.0