linux-kernel - [PATCH 3.12 026/113] drm/nouveau/nv1a,nv1f/disp: fix memory clock rate retrieval

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Message-Id: <444642dc04aa5de123c9c2e16ec352e08e9ee458.1488791430.git.jslaby@suse.cz>
Date:   Mon,  6 Mar 2017 10:10:50 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Ilia Mirkin <imirkin@...m.mit.edu>,
        Ben Skeggs <bskeggs@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 026/113] drm/nouveau/nv1a,nv1f/disp: fix memory clock rate retrieval

From: Ilia Mirkin <imirkin@...m.mit.edu>

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

===============

commit 24bf7ae359b8cca165bb30742d2b1c03a1eb23af upstream.

Based on the xf86-video-nv code, NFORCE (NV1A) and NFORCE2 (NV1F) have a
different way of retrieving clocks. See the
nv_hw.c:nForceUpdateArbitrationSettings function in the original code
for how these clocks were accessed.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54587
Signed-off-by: Ilia Mirkin <imirkin@...m.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/nouveau/dispnv04/hw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv04/hw.c b/drivers/gpu/drm/nouveau/dispnv04/hw.c
index 973056b86207..b16e051e48f0 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/hw.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/hw.c
@@ -224,6 +224,7 @@ nouveau_hw_get_clock(struct drm_device *dev, enum nvbios_pll_type plltype)
 		uint32_t mpllP;
 
 		pci_read_config_dword(pci_get_bus_and_slot(0, 3), 0x6c, &mpllP);
+		mpllP = (mpllP >> 8) & 0xf;
 		if (!mpllP)
 			mpllP = 4;
 
@@ -234,7 +235,7 @@ nouveau_hw_get_clock(struct drm_device *dev, enum nvbios_pll_type plltype)
 		uint32_t clock;
 
 		pci_read_config_dword(pci_get_bus_and_slot(0, 5), 0x4c, &clock);
-		return clock;
+		return clock / 1000;
 	}
 
 	ret = nouveau_hw_get_pllvals(dev, plltype, &pllvals);
-- 
2.12.0