mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
49 lines
1.7 KiB
Diff
49 lines
1.7 KiB
Diff
From 48466df61a9c226b1b51e361aedf977dea6baf5c Mon Sep 17 00:00:00 2001
|
|
From: Eric Anholt <eric@anholt.net>
|
|
Date: Wed, 20 Sep 2017 15:59:34 -0700
|
|
Subject: [PATCH 198/277] 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(+)
|
|
|
|
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
|
|
index 0b2088264039..8ab20c1e9e69 100644
|
|
--- 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(struct drm_encoder *encoder)
|
|
}
|
|
}
|
|
|
|
+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,
|
|
};
|
|
--
|
|
2.16.1
|
|
|