mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
drm/radeon/kms: force legacy pll algo for RV620 LVDS
There has been periodic evidence that LVDS, on at least some panels, prefers the dividers selected by the legacy pll algo. This patch forces the use of the legacy pll algo on RV620 LVDS panels. The old behavior (new pll algo) can be selected by setting the new_pll module parameter to 1. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=30029 Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
parent
b64c115eb2
commit
f90087eea4
@ -539,14 +539,15 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
|
||||
pll->algo = PLL_ALGO_LEGACY;
|
||||
pll->flags |= RADEON_PLL_PREFER_CLOSEST_LOWER;
|
||||
}
|
||||
/* There is some evidence (often anecdotal) that RV515 LVDS
|
||||
/* There is some evidence (often anecdotal) that RV515/RV620 LVDS
|
||||
* (on some boards at least) prefers the legacy algo. I'm not
|
||||
* sure whether this should handled generically or on a
|
||||
* case-by-case quirk basis. Both algos should work fine in the
|
||||
* majority of cases.
|
||||
*/
|
||||
if ((radeon_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT)) &&
|
||||
(rdev->family == CHIP_RV515)) {
|
||||
((rdev->family == CHIP_RV515) ||
|
||||
(rdev->family == CHIP_RV620))) {
|
||||
/* allow the user to overrride just in case */
|
||||
if (radeon_new_pll == 1)
|
||||
pll->algo = PLL_ALGO_NEW;
|
||||
|
Loading…
Reference in New Issue
Block a user