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Mikulas Patocka 3690f530e1 mach64: fix image corruption due to reading accelerator registers 
commit c09bcc91bb upstream.

Reading the registers without waiting for engine idle returns
unpredictable values. These unpredictable values result in display
corruption - if atyfb_imageblit reads the content of DP_PIX_WIDTH with the
bit DP_HOST_TRIPLE_EN set (from previous invocation), the driver would
never ever clear the bit, resulting in display corruption.

We don't want to wait for idle because it would degrade performance, so
this patch modifies the driver so that it never reads accelerator
registers.

HOST_CNTL doesn't have to be read, we can just write it with
HOST_BYTE_ALIGN because no other part of the driver cares if
HOST_BYTE_ALIGN is set.

DP_PIX_WIDTH is written in the functions atyfb_copyarea and atyfb_fillrect
with the default value and in atyfb_imageblit with the value set according
to the source image data.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Ville Syrjälä <syrjala@sci.fi>
Cc: stable@vger.kernel.org
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-21 09:19:17 +01:00
..
backlight backlight: pwm_bl: Fix uninitialized variable 2018-07-25 09:09:59 +01:00
console dummycon: Stop exporting dummycon_[un]register_output_notifier 2018-08-10 17:23:02 +02:00
fbdev mach64: fix image corruption due to reading accelerator registers 2018-11-21 09:19:17 +01:00
logo video/logo: remove obsolete logo files 2018-03-26 15:56:42 +02:00
display_timing.c
hdmi.c media: hdmi.h: rename ADOBE_RGB to OPRGB and ADOBE_YCC to OPYCC 2018-11-13 11:08:54 -08:00
Kconfig fbdev changes for v4.17: 2018-04-10 10:20:00 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
of_display_timing.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
of_videomode.c video: fbdev: Convert to using %pOF instead of full_name 2017-08-07 17:22:13 +02:00
vgastate.c
videomode.c