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drm/i915: After a reset perform a forced modeset 

On more recent chipsets, restoring the display is not as simple as
writing a few registers, so force a full modeset of the current
configuration in order to retrain the display link.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
hifive-unleashed-5.1
Chris Wilson 2010-09-18 08:08:06 +01:00
parent 0573ed4a94
commit 9fd981413e
1 changed files with 12 additions and 9 deletions
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21
drivers/gpu/drm/i915/i915_drv.c
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@ -385,9 +385,6 @@ int i965_reset(struct drm_device *dev, u8 flags)
*/
i915_gem_retire_requests(dev);
if (need_display)
i915_save_display(dev);
/*
* Set the domains we want to reset (GRDOM/bits 2 and 3) as
* well as the reset bit (GR/bit 0). Setting the GR bit
@ -428,13 +425,19 @@ int i965_reset(struct drm_device *dev, u8 flags)
mutex_lock(&dev->struct_mutex);
}
/*
* Display needs restore too...
*/
if (need_display)
i915_restore_display(dev);
mutex_unlock(&dev->struct_mutex);
/*
* Perform a full modeset as on later generations, e.g. Ironlake, we may
* need to retrain the display link and cannot just restore the register
* values.
*/
if (need_display) {
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
mutex_unlock(&dev->mode_config.mutex);
}
return 0;
}