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linux/drivers/video
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Mikulas Patocka 53cecba9b0 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>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2019-02-11 17:53:28 +00:00
..
backlight backlight: as3711_bl: Fix Device Tree node leaks 2018-11-20 18:05:13 +00:00
console console/dummy: leave .con_font_get set to NULL 2018-06-16 22:21:53 +01:00
fbdev mach64: fix image corruption due to reading accelerator registers 2019-02-11 17:53:28 +00:00
logo video/logo: prevent use of logos after they have been freed 2015-01-16 14:34:19 +00:00
display_timing.c video: add display_timing and videomode 2013-01-24 09:03:04 +01:00
hdmi.c video/hdmi: Rename HDMI_IDENTIFIER to HDMI_IEEE_OUI 2013-08-30 08:42:01 +10:00
Kconfig gpu: ipu-v3: Move i.MX IPUv3 core driver out of staging 2014-06-04 11:06:52 +02:00
Makefile fbdev: sti: don't select CONFIG_VT 2017-08-26 02:14:46 +01:00
of_display_timing.c video: of: display_timing: fix default native-mode setting 2014-05-23 13:31:19 +03:00
of_videomode.c videomode: videomode_from_timing work 2013-03-21 14:34:33 +02:00
vgastate.c vga: vgastate fix 2007-05-08 11:15:32 -07:00
videomode.c videomode: videomode_from_timing work 2013-03-21 14:34:33 +02:00