linux-kernel - [ 33/48] drm/nv50/kms: use dac loadval from vbios, where its available

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Date:	Tue, 18 Jun 2013 09:17:59 -0700
From:	Greg Kroah-Hartman <greg@...ah.com>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Emil Velikov <emil.l.velikov@...il.com>,
	Ben Skeggs <bskeggs@...hat.com>
Subject: [ 33/48] drm/nv50/kms: use dac loadval from vbios, where its available

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

3.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Ben Skeggs <bskeggs@...hat.com>

commit d40ee48acde16894fb3b241d7e896d5fa84e0f10 upstream.

Regression from merging the old nv50/nvd9 code together, and may be
needed to fully fix fdo#64904.

The value is ignored completely by the hardware starting from nva3.

Reported-by: Emil Velikov <emil.l.velikov@...il.com>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>

---
 drivers/gpu/drm/nouveau/nv50_display.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -1554,7 +1554,9 @@ nv50_dac_detect(struct drm_encoder *enco
 {
 	struct nv50_disp *disp = nv50_disp(encoder->dev);
 	int ret, or = nouveau_encoder(encoder)->or;
-	u32 load = 0;
+	u32 load = nouveau_drm(encoder->dev)->vbios.dactestval;
+	if (load == 0)
+		load = 340;
 
 	ret = nv_exec(disp->core, NV50_DISP_DAC_LOAD + or, &load, sizeof(load));
 	if (ret || load != 7)


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