drm: mxsfb_crtc: Reset the eLCDIF controller
authorFabio Estevam <fabio.estevam@nxp.com>
Fri, 5 May 2017 18:01:41 +0000 (15:01 -0300)
committerSean Paul <seanpaul@chromium.org>
Thu, 15 Jun 2017 18:26:24 +0000 (14:26 -0400)
commit0f933328f018c118ded2035f12068bbdfdef399d
tree6c3b6a09489c4bff7fb465574b2aadde304808de
parent0cbb738108927916a659b5b0b96e386fcd7cc6e1
drm: mxsfb_crtc: Reset the eLCDIF controller

According to the eLCDIF initialization steps listed in the MX6SX
Reference Manual the eLCDIF block reset is mandatory.

Without performing the eLCDIF reset the display shows garbage content
when the kernel boots.

In earlier tests this issue has not been observed because the bootloader
was previously showing a splash screen and the bootloader display driver
does properly implement the eLCDIF reset.

Add the eLCDIF reset to the driver, so that it can operate correctly
independently of the bootloader.

Tested on a imx6sx-sdb board.

Cc: <stable@vger.kernel.org>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1494007301-14535-1-git-send-email-fabio.estevam@nxp.com
drivers/gpu/drm/mxsfb/mxsfb_crtc.c