linux-kernel - [PATCH 3.12 057/124] drm/i915: save/restore GMBUS freq across suspend/resume on gen4

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Message-Id: <41bed865a517b60873e3e50b954bdec9b978ea1a.1438076484.git.jslaby@suse.cz>
Date:	Tue, 28 Jul 2015 11:43:11 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jani Nikula <jani.nikula@...el.com>,
	Takashi Iwai <tiwai@...e.de>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 057/124] drm/i915: save/restore GMBUS freq across suspend/resume on gen4

From: Jesse Barnes <jbarnes@...tuousgeek.org>

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

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

commit 9f49c37635d5c2a801f7670d5fbf0b25ec461f2c upstream.

Should probably just init this in the GMbus code all the time, based on
the cdclk and HPLL like we do on newer platforms.  Ville has code for
that in a rework branch, but until then we can fix this bug fairly
easily.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76301
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Tested-by: Nikolay <mar.kolya@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/i915/i915_drv.h     | 1 +
 drivers/gpu/drm/i915/i915_reg.h     | 1 +
 drivers/gpu/drm/i915/i915_suspend.c | 8 ++++++++
 3 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 881c9af0971d..8bfbbab820ef 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -817,6 +817,7 @@ struct i915_suspend_saved_registers {
 	u32 savePIPEB_LINK_N1;
 	u32 saveMCHBAR_RENDER_STANDBY;
 	u32 savePCH_PORT_HOTPLUG;
+	u16 saveGCDGMBUS;
 };
 
 struct intel_gen6_power_mgmt {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4e0053e64f14..4438a43cf193 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -72,6 +72,7 @@
 #define   I915_GC_RENDER_CLOCK_166_MHZ	(0 << 0)
 #define   I915_GC_RENDER_CLOCK_200_MHZ	(1 << 0)
 #define   I915_GC_RENDER_CLOCK_333_MHZ	(4 << 0)
+#define GCDGMBUS 0xcc
 #define LBB	0xf4
 
 /* Graphics reset regs */
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 70db618989c4..97f395f16f1c 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -366,6 +366,10 @@ int i915_save_state(struct drm_device *dev)
 
 	intel_disable_gt_powersave(dev);
 
+	if (IS_GEN4(dev))
+		pci_read_config_word(dev->pdev, GCDGMBUS,
+				     &dev_priv->regfile.saveGCDGMBUS);
+
 	/* Cache mode state */
 	dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);
 
@@ -413,6 +417,10 @@ int i915_restore_state(struct drm_device *dev)
 		}
 	}
 
+	if (IS_GEN4(dev))
+		pci_read_config_word(dev->pdev, GCDGMBUS,
+				     &dev_priv->regfile.saveGCDGMBUS);
+
 	/* Cache mode state */
 	I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 | 0xffff0000);
 
-- 
2.4.6

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