[PATCH v2 6/7] drm/vc4: hdmi: Add more checks for 4k resolutions

From: Maxime Ripard
Date: Tue Sep 20 2022 - 08:54:03 EST


From: Dom Cobley <popcornmix@xxxxxxxxx>

At least the 4096x2160@60Hz mode requires some overclocking that isn't
available by default, even if hdmi_enable_4kp60 is enabled.

Let's add some logic to detect whether we can satisfy the core clock
requirements for that mode, and prevent it from being used otherwise.

Signed-off-by: Dom Cobley <popcornmix@xxxxxxxxx>
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 09cdbdb7fff0..094ebe8567e2 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -349,6 +349,12 @@ struct vc4_hvs {
* available.
*/
bool vc5_hdmi_enable_scrambling;
+
+ /*
+ * 4096x2160@60 requires a core overclock to work, so register
+ * whether that is sufficient.
+ */
+ bool vc5_hdmi_enable_4096by2160;
};

struct vc4_plane {
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index f367f93ca832..cf1fee6c29f3 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1476,6 +1476,7 @@ vc4_hdmi_sink_supports_format_bpc(const struct vc4_hdmi *vc4_hdmi,

static enum drm_mode_status
vc4_hdmi_encoder_clock_valid(const struct vc4_hdmi *vc4_hdmi,
+ const struct drm_display_mode *mode,
unsigned long long clock)
{
const struct drm_connector *connector = &vc4_hdmi->connector;
@@ -1488,6 +1489,12 @@ vc4_hdmi_encoder_clock_valid(const struct vc4_hdmi *vc4_hdmi,
if (!vc4->hvs->vc5_hdmi_enable_scrambling && clock > HDMI_14_MAX_TMDS_CLK)
return MODE_CLOCK_HIGH;

+ /* 4096x2160@60 is not reliable without overclocking core */
+ if (!vc4->hvs->vc5_hdmi_enable_4096by2160 &&
+ mode->hdisplay > 3840 && mode->vdisplay >= 2160 &&
+ drm_mode_vrefresh(mode) >= 50)
+ return MODE_CLOCK_HIGH;
+
if (info->max_tmds_clock && clock > (info->max_tmds_clock * 1000))
return MODE_CLOCK_HIGH;

@@ -1522,7 +1529,7 @@ vc4_hdmi_encoder_compute_clock(const struct vc4_hdmi *vc4_hdmi,
unsigned long long clock;

clock = vc4_hdmi_encoder_compute_mode_clock(mode, bpc, fmt);
- if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, clock) != MODE_OK)
+ if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, mode, clock) != MODE_OK)
return -EINVAL;

vc4_state->tmds_char_rate = clock;
@@ -1685,7 +1692,7 @@ vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
(mode->hsync_end % 2) || (mode->htotal % 2)))
return MODE_H_ILLEGAL;

- return vc4_hdmi_encoder_clock_valid(vc4_hdmi, mode->clock * 1000);
+ return vc4_hdmi_encoder_clock_valid(vc4_hdmi, mode, mode->clock * 1000);
}

static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index e28a13a75ec2..32f5ab937ace 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -698,6 +698,9 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
if (max_rate >= 550000000)
hvs->vc5_hdmi_enable_scrambling = true;

+ if (max_rate >= 600000000)
+ hvs->vc5_hdmi_enable_4096by2160 = true;
+
hvs->max_core_rate = max_rate;

ret = clk_prepare_enable(hvs->core_clk);

--
b4 0.10.0