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9891cb5444
linux/drivers/gpu/drm/mxsfb
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Marek Vasut 9891cb5444 drm: mxsfb: Increase number of outstanding requests on V4 and newer HW 
In case the DRAM is under high load, the MXSFB FIFO might underflow
and that causes visible artifacts. This could be triggered on i.MX8MM
using e.g. "$ memtester 128M" on a device with 1920x1080 panel. The
first "Stuck Address" test of the memtester will completely corrupt
the image on the panel and leave the MXSFB FIFO in odd state.

To avoid this underflow, increase number of outstanding requests to
DRAM from 2 to 16, which is the maximum. This mitigates the issue
and it can no longer be triggered.

Fixes: 45d59d7040 ("drm: Add new driver for MXSFB controller")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Abrecht <public@danielabrecht.ch>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Stefan Agner <stefan@agner.ch>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210620224759.189351-1-marex@denx.de
2021-07-27 21:15:24 +02:00
..
Kconfig drm/mxsfb: Don't select DRM_KMS_FB_HELPER 2021-04-26 12:42:57 +02:00
Makefile drm: mxsfb: Rename mxsfb_crtc.c to mxsfb_kms.c 2020-07-28 17:21:01 +02:00
mxsfb_drv.c drm: mxsfb: Increase number of outstanding requests on V4 and newer HW 2021-07-27 21:15:24 +02:00
mxsfb_drv.h drm: mxsfb: Increase number of outstanding requests on V4 and newer HW 2021-07-27 21:15:24 +02:00
mxsfb_kms.c drm: mxsfb: Increase number of outstanding requests on V4 and newer HW 2021-07-27 21:15:24 +02:00
mxsfb_regs.h drm: mxsfb: Increase number of outstanding requests on V4 and newer HW 2021-07-27 21:15:24 +02:00