From 308eeb8ca3fdee54bcd3ec7272c05688e178299a Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 2 Dec 2025 19:11:06 +0100 Subject: [PATCH] drm/rcar-du: dsi: Handle both DRM_MODE_FLAG_N.SYNC and !DRM_MODE_FLAG_P.SYNC Since commit 94fe479fae96 ("drm/rcar-du: dsi: Clean up handling of DRM mode flags") the driver does not set TXVMVPRMSET0R_VSPOL_LOW and TXVMVPRMSET0R_HSPOL_LOW for modes which set neither DRM_MODE_FLAG_[PN].SYNC. The previous behavior was to assume that neither flag means DRM_MODE_FLAG_N.SYNC . Restore the previous behavior for maximum compatibility. The change of behavior is visible below, consider Vertical mode->flags for simplicity sake, although the same applies to Horizontal ones: Before 94fe479fae96 ("drm/rcar-du: dsi: Clean up handling of DRM mode flags") : - DRM_MODE_FLAG_PVSYNC => vprmset0r |= 0 - DRM_MODE_FLAG_NVSYNC => vprmset0r |= TXVMVPRMSET0R_VSPOL_LOW - Neither DRM_MODE_FLAG_[PN]VSYNC => vprmset0r |= TXVMVPRMSET0R_VSPOL_LOW After 94fe479fae96 ("drm/rcar-du: dsi: Clean up handling of DRM mode flags") : - DRM_MODE_FLAG_PVSYNC => vprmset0r |= 0 - DRM_MODE_FLAG_NVSYNC => vprmset0r |= TXVMVPRMSET0R_VSPOL_LOW - Neither DRM_MODE_FLAG_[PN]VSYNC => vprmset0r |= 0 <---------- This broke The "Neither" case behavior is different, because DRM_MODE_FLAG_N[HV]SYNC is really not equivalent !DRM_MODE_FLAG_P[HV]SYNC . Fixes: 94fe479fae96 ("drm/rcar-du: dsi: Clean up handling of DRM mode flags") Signed-off-by: Marek Vasut Reviewed-by: Laurent Pinchart Link: https://patch.msgid.link/20251202181146.138365-1-marek.vasut+renesas@mailbox.org Signed-off-by: Tomi Valkeinen --- drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c index 9413b76d0bfce..4ef2e3c129ed7 100644 --- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c @@ -492,9 +492,9 @@ static void rcar_mipi_dsi_set_display_timing(struct rcar_mipi_dsi *dsi, /* Configuration for Video Parameters, input is always RGB888 */ vprmset0r = TXVMVPRMSET0R_BPP_24; - if (mode->flags & DRM_MODE_FLAG_NVSYNC) + if (!(mode->flags & DRM_MODE_FLAG_PVSYNC)) vprmset0r |= TXVMVPRMSET0R_VSPOL_LOW; - if (mode->flags & DRM_MODE_FLAG_NHSYNC) + if (!(mode->flags & DRM_MODE_FLAG_PHSYNC)) vprmset0r |= TXVMVPRMSET0R_HSPOL_LOW; vprmset1r = TXVMVPRMSET1R_VACTIVE(mode->vdisplay) -- 2.47.3