diff options
| author | Stefan Agner <stefan.agner@toradex.com> | 2016-01-25 15:44:32 -0800 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-12-24 01:27:34 +0100 |
| commit | 3df4eef3dcbc9926b11c327c25ebbd717674e1f0 (patch) | |
| tree | 963f5206e2a66df4e2e5e416c8eb4c5ba02890f9 /drivers/video | |
| parent | a2cbd4ab6c2d3b2f7cf2fb1312ec4f08fe01d5dc (diff) | |
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@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>
(cherry picked from commit 5652dc1ad78303fb246f050ba23c563319d823cf)
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/mxsfb.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/video/fbdev/mxsfb.c b/drivers/video/fbdev/mxsfb.c index 3864fbf60e0b..71ea8df544f1 100644 --- a/drivers/video/fbdev/mxsfb.c +++ b/drivers/video/fbdev/mxsfb.c @@ -1434,7 +1434,16 @@ static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host) if (!(vm.flags & DISPLAY_FLAGS_DE_HIGH)) fb_vm.sync |= FB_SYNC_OE_LOW_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) fb_vm.sync |= FB_SYNC_CLK_LAT_FALL; if (i == timings->native_mode) { |