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SubjectRe: Oops in i915 intel_init_clock_gating
The problem of dev_priv->display.init_clock_gating not getting set is 
still present in 3.0-rc3. On my system this happens because
intel_init_display() never gets called in the first place.

AFAICT, the normal calling sequence during driver initialization is:

i915_driver_load() -> i915_load_modeset_init() ->
intel_modeset_init() -> intel_init_display().

But in my case the call to i915_load_modeset_init() doesn't occur
because drm_core_check_feature(dev, DRIVER_MODESET) is False.

I tested with the following patch:


Index: usb-3.0/drivers/gpu/drm/i915/intel_display.c
===================================================================
--- usb-3.0.orig/drivers/gpu/drm/i915/intel_display.c
+++ usb-3.0/drivers/gpu/drm/i915/intel_display.c
@@ -7511,6 +7511,10 @@ void intel_init_clock_gating(struct drm_
{
struct drm_i915_private *dev_priv = dev->dev_private;

+ if (!dev_priv->display.init_clock_gating) {
+ printk(KERN_WARNING "init_clock_gating not set!\n");
+ WARN_ON(1);
+ } else
dev_priv->display.init_clock_gating(dev);

if (dev_priv->display.init_pch_clock_gating)
Index: usb-3.0/drivers/gpu/drm/i915/i915_dma.c
===================================================================
--- usb-3.0.orig/drivers/gpu/drm/i915/i915_dma.c
+++ usb-3.0/drivers/gpu/drm/i915/i915_dma.c
@@ -2078,7 +2078,9 @@ int i915_driver_load(struct drm_device *

intel_detect_pch(dev);

+printk(KERN_INFO "Testing drm_core_check_feature DRIVER_MODESET\n");
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+printk(KERN_INFO "Calling i915_load_modeset_init\n");
ret = i915_load_modeset_init(dev);
if (ret < 0) {
DRM_ERROR("failed to init modeset\n");

Here is the dmesg log showing what happens during "insmod i915.ko":

[ 908.129497] pci 0000:00:02.0: setting latency timer to 64
[ 908.179865] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[ 908.180633] [drm] No driver support for vblank timestamp query.
[ 908.180804] Testing drm_core_check_feature DRIVER_MODESET
[ 908.181120] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
The first debugging message is printed but not the second.


Here is what happens during a resume from system suspend:

[ 943.013656] init_clock_gating not set!
[ 943.013790] ------------[ cut here ]------------
[ 943.013954] WARNING: at drivers/gpu/drm/i915/intel_display.c:7516 intel_init_clock_gating+0x30/0x4a [i915]()
[ 943.014193] Hardware name: HP dx2000 MT (EE004AA)
[ 943.014330] Modules linked in: i915 fbcon font bitblit softcursor drm_kms_helper drm fb fbdev i2c_algo_bit cfbcopyarea i2c_core video backlight cfbimgblt cfbfillrect e100 ohci_hcd mii pcspkr evdev uhci_hcd ehci_hcd fan processor thermal_sys button usbcore [last unloaded: i915]
[ 943.015825] Pid: 1678, comm: bash Not tainted 3.0.0-rc3 #2
[ 943.015966] Call Trace:
[ 943.016179] [<c1027315>] warn_slowpath_common+0x65/0x7a
[ 943.016342] [<f013e716>] ? intel_init_clock_gating+0x30/0x4a [i915]
[ 943.016487] [<c1027339>] warn_slowpath_null+0xf/0x13
[ 943.016644] [<f013e716>] intel_init_clock_gating+0x30/0x4a [i915]
[ 943.016801] [<f012f1f9>] i915_restore_state+0xf4/0x1bf [i915]
[ 943.016989] [<f0124100>] i915_drm_thaw+0x41/0xc1 [i915]
[ 943.017141] [<f01242c0>] i915_resume+0x38/0x4b [i915]
[ 943.017301] [<f00b0472>] drm_class_resume+0x39/0x3b [drm]
[ 943.017447] [<c116b520>] legacy_resume+0x1e/0x46
[ 943.017599] [<f00b0439>] ? drm_class_suspend+0x3d/0x3d [drm]
[ 943.017742] [<c116b7de>] device_resume+0x83/0xa0
[ 943.017881] [<c116bdd8>] dpm_resume+0xdc/0x156
[ 943.018020] [<c116bf68>] dpm_resume_end+0xb/0x15
[ 943.018162] [<c1053994>] suspend_devices_and_enter+0x165/0x192
[ 943.018330] [<c1053a93>] enter_state+0xd2/0x123
[ 943.018471] [<c105329f>] state_store+0x95/0xa1
[ 943.018610] [<c105320a>] ? pm_async_store+0x33/0x33
[ 943.018752] [<c1103c15>] kobj_attr_store+0x16/0x22
[ 943.018894] [<c10c7e5b>] sysfs_write_file+0xb3/0xec
[ 943.019034] [<c10c7da8>] ? sysfs_open_file+0x1c2/0x1c2
[ 943.019176] [<c108d793>] vfs_write+0x76/0xa2
[ 943.019315] [<c108d8f6>] sys_write+0x3b/0x5d
[ 943.019456] [<c11fb610>] sysenter_do_call+0x12/0x36
[ 943.019625] ---[ end trace dc74bd86a8bff7da ]---

What's the right way to fix this?

Alan Stern



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