linux-kernel - [PATCH v1 6/7] drm/vc4: hdmi: Add more checks for 4k resolutions

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Message-Id: <20220815-rpi-fix-4k-60-v1-6-c52bd642f7c6@cerno.tech>
Date:   Mon, 15 Aug 2022 17:31:28 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Michael Turquette <mturquette@...libre.com>,
        Ray Jui <rjui@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <sboyd@...nel.org>,
        Scott Branden <sbranden@...adcom.com>,
        Maxime Ripard <mripard@...nel.org>,
        Emma Anholt <emma@...olt.net>
Cc:     Maxime Ripard <maxime@...no.tech>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, Dom Cobley <popcornmix@...il.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 6/7] drm/vc4: hdmi: Add more checks for 4k resolutions

From: Dom Cobley <popcornmix@...il.com>

At least the 4096x2160@...z 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@...il.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index d48ef302af42..e05f62a7eed6 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -347,6 +347,12 @@ 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 371fbc05bf5a..5abbb2fe41ac 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 3fdd2c4356f6..6cfc1a4e7161 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -673,6 +673,7 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 	hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
 
 	if (vc4->is_vc5) {
+		unsigned long min_rate;
 		unsigned long max_rate;
 
 		hvs->core_clk = devm_clk_get(&pdev->dev, NULL);
@@ -685,6 +686,10 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 		if (max_rate >= 550000000)
 			hvs->vc5_hdmi_enable_scrambling = true;
 
+		min_rate = rpi_firmware_clk_get_min_rate(hvs->core_clk);
+		if (min_rate >= 600000000)
+			hvs->vc5_hdmi_enable_4096by2160 = true;
+
 		ret = clk_prepare_enable(hvs->core_clk);
 		if (ret) {
 			dev_err(&pdev->dev, "Couldn't enable the core clock\n");

-- 
b4 0.10.0-dev-a76f5