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fix: apply DSI burst mode fix as kernel patch overlay

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Hermes
2026-06-13 13:47:35 -04:00
parent 6543de3a45
commit 4d8087badf
2 changed files with 33 additions and 0 deletions
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10
hosts/uconsole-cm5/configuration.nix
View File

@@ -25,4 +25,14 @@
# Firmware
hardware.enableRedistributableFirmware = true;
# DSI burst mode fix: remove SYNC_PULSE flag from CWU50 panel driver
# BURST and SYNC_PULSE are mutually exclusive per MIPI DSI spec;
# having both set causes display corruption on CM5
boot.kernelPatches = lib.mkAfter [
{
name = "0008-dsi-burst-fix";
patch = ./patches/0008-dsi-burst-fix.patch;
}
];
}

23
hosts/uconsole-cm5/patches/0008-dsi-burst-fix.patch Normal file
View File

@@ -0,0 +1,23 @@
diff --git a/drivers/gpu/drm/panel/panel-cwu50.c b/drivers/gpu/drm/panel/panel-cwu50.c
index 1111111..2222222 100644
--- a/drivers/gpu/drm/panel/panel-cwu50.c
+++ b/drivers/gpu/drm/panel/panel-cwu50.c
@@ -1072,7 +1072,7 @@ static int cwu50_probe(struct mipi_dsi_device *dsi)
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
- dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
ctx->id_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_IN);
if (IS_ERR(ctx->id_gpio)) {
@@ -1706,7 +1706,7 @@ static int cwu50_cm3_probe(struct mipi_dsi_device *dsi)
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
- MIPI_DSI_MODE_VIDEO_BURST |
- MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ MIPI_DSI_MODE_VIDEO_BURST;
ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ctx->reset_gpio)) {