From: Alex Deucher Date: Tue, 7 Sep 2010 15:42:45 +0000 (-0400) Subject: drm/radeon/kms: force legacy pll algo for RV620 LVDS X-Git-Tag: v2.6.35.5~13 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af38a70db3311742ab23f02bc17cd7400bd6202a;p=thirdparty%2Fkernel%2Fstable.git drm/radeon/kms: force legacy pll algo for RV620 LVDS commit f90087eea44ce5fad139f086bc9d89ca37b0edc2 upstream. 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 Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c index 3271b5a3421f8..eac868a6cd116 100644 --- a/drivers/gpu/drm/radeon/atombios_crtc.c +++ b/drivers/gpu/drm/radeon/atombios_crtc.c @@ -527,14 +527,15 @@ 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;