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| author | Stefan Agner <stefan@agner.ch> | 2017-11-09 18:09:30 +0100 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2017-11-09 18:09:30 +0100 |
| commit | 2d81482821e9a825030cf4ba60de990f1a2bdfd0 (patch) | |
| tree | 6163dcf2842014a680a260289e2b467e9903a500 | |
| parent | ab798b908737e999e5d9bcebe972e9d5002583cc (diff) | |
| download | linux-2d81482821e9a825030cf4ba60de990f1a2bdfd0.tar.bz2 | |
video: fbdev: mxsfb: fix pixelclock polarity
The PIXDATA flags of the display_flags enum are controller centric,
e.g. NEGEDGE means the controller shall drive the data signals on
pixelclocks negative edge. However, the drivers flag is display
centric: Sample the data on negative (falling) edge.
Therefore, change the if statement to check for the POSEDGE flag
(which is typically not set):
Drive on positive edge => sample on negative edge
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Liu Ying <Ying.Liu@freescale.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Max Krummenacher <max.krummenacher@toradex.com>
Cc: Mauro Salvini <mauro.salvini@smigroup.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
| -rw-r--r-- | drivers/video/fbdev/mxsfb.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/video/fbdev/mxsfb.c b/drivers/video/fbdev/mxsfb.c index 7846f0e8bbbb..79b1dc7f042b 100644 --- a/drivers/video/fbdev/mxsfb.c +++ b/drivers/video/fbdev/mxsfb.c @@ -150,7 +150,7 @@ #define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */ #define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6) -#define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negtive edge sampling */ +#define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negative edge sampling */ enum mxsfb_devtype { MXSFB_V3, @@ -788,7 +788,16 @@ static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host, if (vm.flags & DISPLAY_FLAGS_DE_HIGH) host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT; - if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) + + /* + * The PIXDATA flags of the display_flags enum are controller + * centric, e.g. NEGEDGE means drive data on negative edge. + * However, the drivers flag is display centric: Sample the + * data on negative (falling) edge. Therefore, check for the + * POSEDGE flag: + * drive on positive edge => sample on negative edge + */ + if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE) host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT; put_display_node: |