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. References: https://bugs.freedesktop.org/show_bug.cgi?id=76301 Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> --- 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 2725243..f33102b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -925,6 +925,7 @@ struct i915_suspend_saved_registers { u32 savePIPEB_LINK_N1; u32 saveMCHBAR_RENDER_STANDBY; u32 savePCH_PORT_HOTPLUG; + u16 saveGCDGMBUS; }; struct vlv_s0ix_state { diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index dc03fac..f7c2856 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -76,6 +76,7 @@ #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 PCI_LBPC 0xf4 /* legacy/combination backlight modes, also called LBB */ diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c index dfe6617..2636882 100644 --- a/drivers/gpu/drm/i915/i915_suspend.c +++ b/drivers/gpu/drm/i915/i915_suspend.c @@ -303,6 +303,10 @@ int i915_save_state(struct drm_device *dev) } } + if (IS_GEN4(dev)) + pci_read_config_word(dev->pdev, GCDGMBUS, + &dev_priv->regfile.saveGCDGMBUS); + /* Cache mode state */ if (INTEL_INFO(dev)->gen < 7) dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0); @@ -331,6 +335,10 @@ int i915_restore_state(struct drm_device *dev) mutex_lock(&dev->struct_mutex); i915_gem_restore_fences(dev); + + if (IS_GEN4(dev)) + pci_write_config_word(dev->pdev, GCDGMBUS, + dev_priv->regfile.saveGCDGMBUS); i915_restore_display(dev); if (!drm_core_check_feature(dev, DRIVER_MODESET)) { -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
