From 9f49c37635d5c2a801f7670d5fbf0b25ec461f2c Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Wed, 10 Dec 2014 12:16:05 -0800 Subject: drm/i915: save/restore GMBUS freq across suspend/resume on gen4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ville Syrjälä Tested-by: Nikolay Cc: stable@vger.kernel.org Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_suspend.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/gpu/drm/i915/i915_suspend.c') diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c index dfe661743398..26368822a33f 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)) { -- cgit v1.2.3