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