diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0179-drm-vc4-Reject-HDMI-modes-with-too-high-of-clocks.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0179-drm-vc4-Reject-HDMI-modes-with-too-high-of-clocks.patch | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0179-drm-vc4-Reject-HDMI-modes-with-too-high-of-clocks.patch b/target/linux/brcm2708/patches-4.14/950-0179-drm-vc4-Reject-HDMI-modes-with-too-high-of-clocks.patch new file mode 100644 index 0000000000..bef2811458 --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0179-drm-vc4-Reject-HDMI-modes-with-too-high-of-clocks.patch @@ -0,0 +1,44 @@ +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, + }; |