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52 lines
2.1 KiB
Diff
52 lines
2.1 KiB
Diff
From 492715220247230c5a936a8113855e73531ba7b7 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Thu, 24 Mar 2022 11:57:57 +0100
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Subject: [PATCH 468/726] drm/vc4: hdmi: Fix hdmi_enable_4kp60 detection
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In order to support higher HDMI frequencies, users have to set the
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hdmi_enable_4kp60 parameter in their config.txt file.
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We were detecting this so far by calling clk_round_rate() on the core
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clock with the frequency we're supposed to run at when one of those
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modes is enabled. Whether or not the parameter was enabled could then be
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inferred by the returned rate since the maximum clock rate reported by
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the firmware was one of the side effect of setting that parameter.
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However, the recent clock rework we did changed what clk_round_rate()
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was returning to always return the minimum allowed, and thus this test
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wasn't reliable anymore.
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Let's use the new clk_get_max_rate() function to reliably determine the
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maximum rate allowed on that clock and fix the 4k@60Hz output.
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Fixes: e9d6cea2af1c ("clk: bcm: rpi: Run some clocks at the minimum rate allowed")
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Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
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index 3546c7af0329..fc8312d7702f 100644
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--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
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+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -46,6 +46,7 @@
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#include <linux/pm_runtime.h>
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#include <linux/rational.h>
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#include <linux/reset.h>
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+#include <soc/bcm2835/raspberrypi-clocks.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/hdmi-codec.h>
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#include <sound/pcm_drm_eld.h>
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@@ -3695,7 +3696,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
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if (variant->max_pixel_clock == 600000000) {
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struct vc4_dev *vc4 = to_vc4_dev(drm);
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- long max_rate = clk_round_rate(vc4->hvs->core_clk, 550000000);
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+ unsigned int max_rate = rpi_firmware_clk_get_max_rate(vc4->hvs->core_clk);
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if (max_rate < 550000000)
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vc4_hdmi->disable_4kp60 = true;
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--
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2.33.1
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