diff options
| author | Marek Vasut <marek.vasut+renesas@mailbox.org> | 2025-12-02 19:11:06 +0100 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2025-12-04 14:59:21 +0200 |
| commit | 308eeb8ca3fdee54bcd3ec7272c05688e178299a (patch) | |
| tree | f62677ab09033e71133f7321eb402bdde9fdb7ac | |
| parent | 4cbae3748fc479f1944e8ef2b3ed4a05cd799ce8 (diff) | |
| download | tip-308eeb8ca3fdee54bcd3ec7272c05688e178299a.tar.gz | |
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 <marek.vasut+renesas@mailbox.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://patch.msgid.link/20251202181146.138365-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
| -rw-r--r-- | drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c | 4 |
1 files 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 9413b76d0bfce0..4ef2e3c129ed7e 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) |