linux-kernel - [37/70] drm/radeon/kms: add missing frac fb div flag for dce4+

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Date:	Tue, 22 Feb 2011 14:17:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alex Deucher <alexdeucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [37/70] drm/radeon/kms: add missing frac fb div flag for dce4+

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Alex Deucher <alexdeucher@...il.com>

commit 9f4283f49f0a96a64c5a45fe56f0f8c942885eef upstream.

The fixed ref/post dividers are set by the AdjustPll table
rather than the ss info table on dce4+.  Make sure we enable
the fractional feedback dividers when using a fixed post
or ref divider on them as well.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=29272

Signed-off-by: Alex Deucher <alexdeucher@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/atombios_crtc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -533,9 +533,9 @@ static u32 atombios_adjust_pll(struct dr
 
 			/* use recommended ref_div for ss */
 			if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
-				pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
 				if (ss_enabled) {
 					if (ss->refdiv) {
+						pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
 						pll->flags |= RADEON_PLL_USE_REF_DIV;
 						pll->reference_div = ss->refdiv;
 						if (ASIC_IS_AVIVO(rdev))
@@ -650,10 +650,12 @@ static u32 atombios_adjust_pll(struct dr
 						   index, (uint32_t *)&args);
 				adjusted_clock = le32_to_cpu(args.v3.sOutput.ulDispPllFreq) * 10;
 				if (args.v3.sOutput.ucRefDiv) {
+					pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
 					pll->flags |= RADEON_PLL_USE_REF_DIV;
 					pll->reference_div = args.v3.sOutput.ucRefDiv;
 				}
 				if (args.v3.sOutput.ucPostDiv) {
+					pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
 					pll->flags |= RADEON_PLL_USE_POST_DIV;
 					pll->post_div = args.v3.sOutput.ucPostDiv;
 				}


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