The current code only base its decision for whether the scrambler must be enabled or not on the pixel clock of the mode, but doesn't take the bits per color into account.
Let's leverage the new function to compute the clock rate in the scrambler setup code.
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_hdmi.c | 17 +++++++++++++---- drivers/gpu/drm/vc4/vc4_hdmi.h | 5 +++++ 2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index e8e70727b5f3..c97ded028a2a 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -99,9 +99,17 @@
#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000)
-static bool vc4_hdmi_mode_needs_scrambling(const struct drm_display_mode *mode) + +static unsigned long long +vc4_hdmi_encoder_compute_mode_clock(const struct drm_display_mode *mode, + unsigned int bpc); + +static bool vc4_hdmi_mode_needs_scrambling(const struct drm_display_mode *mode, + unsigned int bpc) { - return (mode->clock * 1000) > HDMI_14_MAX_TMDS_CLK; + unsigned long long clock = vc4_hdmi_encoder_compute_mode_clock(mode, bpc); + + return clock > HDMI_14_MAX_TMDS_CLK; }
static bool vc4_hdmi_is_full_range_rgb(struct vc4_hdmi *vc4_hdmi, @@ -272,7 +280,7 @@ static int vc4_hdmi_connector_get_modes(struct drm_connector *connector) struct drm_display_mode *mode;
list_for_each_entry(mode, &connector->probed_modes, head) { - if (vc4_hdmi_mode_needs_scrambling(mode)) { + if (vc4_hdmi_mode_needs_scrambling(mode, 8)) { drm_warn_once(drm, "The core clock cannot reach frequencies high enough to support 4k @ 60Hz."); drm_warn_once(drm, "Please change your config.txt file to add hdmi_enable_4kp60."); } @@ -613,7 +621,7 @@ static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder) if (!vc4_hdmi_supports_scrambling(encoder, mode)) return;
- if (!vc4_hdmi_mode_needs_scrambling(mode)) + if (!vc4_hdmi_mode_needs_scrambling(mode, vc4_hdmi->output_bpc)) return;
drm_scdc_set_high_tmds_clock_ratio(vc4_hdmi->ddc, true); @@ -1242,6 +1250,7 @@ static void vc4_hdmi_encoder_atomic_mode_set(struct drm_encoder *encoder, mutex_lock(&vc4_hdmi->mutex); drm_mode_copy(&vc4_hdmi->saved_adjusted_mode, &crtc_state->adjusted_mode); + vc4_hdmi->output_bpc = conn_state->max_bpc; mutex_unlock(&vc4_hdmi->mutex); }
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h index 37a87d7e167a..cb744bc5489b 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h @@ -216,6 +216,11 @@ struct vc4_hdmi { * the scrambler on? Protected by @mutex. */ bool scdc_enabled; + + /** + * @output_bpc: BPC currently being used. Protected by @mutex. + */ + unsigned int output_bpc; };
static inline struct vc4_hdmi *