linux-kernel - [79/90] drm/i915: save/restore BLC histogram control reg across suspend/resume

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Date:	Wed, 16 Dec 2009 17:15:30 -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,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Eric Anholt <eric@...olt.net>,
	Stefan Bader <stefan.bader@...onical.com>
Subject: [79/90] drm/i915: save/restore BLC histogram control reg across suspend/resume

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

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

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

commit 0eb96d6ed38430b72897adde58f5477a6b71757a upstream.

Turns out some machines, like the ThinkPad X40 don't come back if you
don't save/restore this register.

Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Eric Anholt <eric@...olt.net>
Cc: Stefan Bader <stefan.bader@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/i915_drv.h     |    1 +
 drivers/gpu/drm/i915/i915_reg.h     |    2 ++
 drivers/gpu/drm/i915/i915_suspend.c |    2 ++
 3 files changed, 5 insertions(+)

--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -264,6 +264,7 @@ typedef struct drm_i915_private {
 	u32 saveDSPASURF;
 	u32 saveDSPATILEOFF;
 	u32 savePFIT_PGM_RATIOS;
+	u32 saveBLC_HIST_CTL;
 	u32 saveBLC_PWM_CTL;
 	u32 saveBLC_PWM_CTL2;
 	u32 saveFPB0;
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -915,6 +915,8 @@
 #define   BACKLIGHT_DUTY_CYCLE_SHIFT		(0)
 #define   BACKLIGHT_DUTY_CYCLE_MASK		(0xffff)
 
+#define BLC_HIST_CTL		0x61260
+
 /* TV port control */
 #define TV_CTL			0x68000
 /** Enables the TV encoder */
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -416,6 +416,7 @@ int i915_save_state(struct drm_device *d
 	dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
 	dev_priv->savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
 	dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
+	dev_priv->saveBLC_HIST_CTL = I915_READ(BLC_HIST_CTL);
 	if (IS_I965G(dev))
 		dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 	if (IS_MOBILE(dev) && !IS_I830(dev))
@@ -560,6 +561,7 @@ int i915_restore_state(struct drm_device
 
 	I915_WRITE(PFIT_PGM_RATIOS, dev_priv->savePFIT_PGM_RATIOS);
 	I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
+	I915_WRITE(BLC_HIST_CTL, dev_priv->saveBLC_HIST_CTL);
 	I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON_DELAYS);
 	I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF_DELAYS);
 	I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);


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