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

Maxime Ripard
2020-12-07T16:00:05Z

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>
---
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