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 <alexdeuc...@gmail.com> Cc: sta...@kernel.org --- drivers/gpu/drm/radeon/atombios_crtc.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c index 464a81a..cd0290f 100644 --- a/drivers/gpu/drm/radeon/atombios_crtc.c +++ b/drivers/gpu/drm/radeon/atombios_crtc.c @@ -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; -- 1.7.1.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel
