On 02/02/2017 10:26 PM, Fabio Estevam wrote: > From: Fabio Estevam <fabio.estevam@xxxxxxx> > > Currently the framebuffer content is displayed with incorrect offsets > in both the vertical and horizontal directions. > > The fbdev version of the driver does not show this problem. Breno Lima > dumped the eLCDIF controller registers on both the drm and fbdev drivers > and noticed that the VDCTRL3 register is configured incorrectly in the > drm driver. > > The fbdev driver calculates the vertical and horizontal wait counts > of the VDCTRL3 register by doing: back porch + sync length. > > Looking at the horizontal and vertical timing diagram from > include/drm/drm_modes.h this value corresponds to: > > crtc_[hv]total - crtc_[hv]sync_start > > So fix the VDCTRL3 register setting accordingly so that the eLCDIF > controller can properly show the framebuffer content in the correct > position. > > Reported-by: Breno Lima <breno.lima@xxxxxxx> > Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxx> Tested-by: Marek Vasut <marex@xxxxxxx> -- Best regards, Marek Vasut _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
