Am 13.10.22 um 15:28 schrieb Jocelyn Falempe:
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 85397f6bc4ff ("drm/mgag200: Initialize each model in separate function") 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
drivers/gpu/drm/mgag200/mgag200_g200se.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200se.c b/drivers/gpu/drm/mgag200/mgag200_g200se.c index be389ed91cbd..bd6e573c9a1a 100644 --- a/drivers/gpu/drm/mgag200/mgag200_g200se.c +++ b/drivers/gpu/drm/mgag200/mgag200_g200se.c @@ -284,7 +284,8 @@ static void mgag200_g200se_04_pixpllc_atomic_update(struct drm_crtc *crtc, pixpllcp = pixpllc->p - 1; pixpllcs = pixpllc->s;
- xpixpllcm = pixpllcm | ((pixpllcn & BIT(8)) >> 1);
- // For G200SE A, BIT(7) should be set unconditionally.
- xpixpllcm = BIT(7) | pixpllcm; xpixpllcn = pixpllcn; xpixpllcp = (pixpllcs << 3) | pixpllcp;