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author | Jocelyn Falempe <jfalempe@redhat.com> | 2022-10-13 15:28:10 +0200 |
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committer | Jocelyn Falempe <jfalempe@redhat.com> | 2022-10-18 16:06:10 +0200 |
commit | b389286d0234e1edbaf62ed8bc0892a568c33662 (patch) | |
tree | ed89898ad55f56c19723413c19eaef37819aaf7a /drivers/gpu/drm/drm_sysfs.c | |
parent | Merge drm/drm-next into drm-misc-next (diff) | |
download | linux-b389286d0234e1edbaf62ed8bc0892a568c33662.tar.xz linux-b389286d0234e1edbaf62ed8bc0892a568c33662.zip |
drm/mgag200: Fix PLL setup for G200_SE_A rev >=4
For G200_SE_A, PLL M setting is wrong, which leads to blank screen,
or "signal out of range" on VGA display.
previous code had "m |= 0x80" which was changed to
m |= ((pixpllcn & BIT(8)) >> 1);
Tested on G200_SE_A rev 42
This line of code was moved to another file with
commit 877507bb954e ("drm/mgag200: Provide per-device callbacks for
PIXPLLC") but can be easily backported before this commit.
v2: * put BIT(7) First to respect MSB-to-LSB (Thomas)
* Add a comment to explain that this bit must be set (Thomas)
Fixes: 2dd040946ecf ("drm/mgag200: Store values (not bits) in struct mgag200_pll_values")
Cc: stable@vger.kernel.org
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20221013132810.521945-1-jfalempe@redhat.com
Diffstat (limited to 'drivers/gpu/drm/drm_sysfs.c')
0 files changed, 0 insertions, 0 deletions