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45 lines
1.5 KiB
Diff
45 lines
1.5 KiB
Diff
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From ee3cf448adf29e8948c40d251f87d87a9817515c Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Wed, 20 Sep 2017 15:59:34 -0700
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Subject: [PATCH 179/454] drm/vc4: Reject HDMI modes with too high of clocks.
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Peter Robinson reported issues on Fedora with 4k monitors not having
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their modes filtered down to 1920x1080 on Raspberry Pi.
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v2: Fix vc5 typo in place of vc4.
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Cc: Peter Robinson <pbrobinson@redhat.com>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Link: https://patchwork.freedesktop.org/patch/msgid/20170920225935.14566-1-eric@anholt.net
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Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v1)
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(cherry picked from commit 32e823c63e90f7535ea1cc5311d25c0233e1456d)
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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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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@@ -695,7 +695,22 @@ static void vc4_hdmi_encoder_enable(stru
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}
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}
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+static enum drm_mode_status
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+vc4_hdmi_encoder_mode_valid(struct drm_encoder *crtc,
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+ const struct drm_display_mode *mode)
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+{
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+ /* HSM clock must be 108% of the pixel clock. Additionally,
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+ * the AXI clock needs to be at least 25% of pixel clock, but
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+ * HSM ends up being the limiting factor.
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+ */
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+ if (mode->clock > HSM_CLOCK_FREQ / (1000 * 108 / 100))
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+ return MODE_CLOCK_HIGH;
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+
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+ return MODE_OK;
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+}
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+
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static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
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+ .mode_valid = vc4_hdmi_encoder_mode_valid,
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.disable = vc4_hdmi_encoder_disable,
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.enable = vc4_hdmi_encoder_enable,
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};
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