Messages in this thread Patch in this message | | | Date | Wed, 16 Dec 2009 17:15:30 -0800 | From | Greg KH <> | Subject | [79/90] drm/i915: save/restore BLC histogram control reg across suspend/resume |
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2.6.31-stable review patch. If anyone has any objections, please let us know.
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From: Jesse Barnes <jbarnes@virtuousgeek.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@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net> Cc: Stefan Bader <stefan.bader@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.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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