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drm/i915, HD-audio: Don't continue probing when nomodeset is given

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When a machine is booted with nomodeset option, i915 driver skips the
whole initialization.  Meanwhile, HD-audio tries to bind wth i915 just
by request_symbol() without knowing that the initialization was
skipped, and eventually it hits WARN_ON() in i915_request_power_well()
and i915_release_power_well() wrongly but still continues probing,
even though it doesn't work at all.

In this patch, both functions are changed to return an error in case
of uninitialized state instead of WARN_ON(), so that HD-audio driver
can give up HDMI controller initialization at the right time.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: <stable@vger.kernel.org> [3.15]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-06-13 15:14:34 +02:00
parent 7171511eae
commit 74b0c2d75f
5 changed files with 24 additions and 17 deletions
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14
drivers/gpu/drm/i915/intel_pm.c
View file

@ -6024,30 +6024,32 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
static struct i915_power_domains *hsw_pwr;
/* Display audio driver power well request */
void i915_request_power_well(void)
int i915_request_power_well(void)
{
struct drm_i915_private *dev_priv;
if (WARN_ON(!hsw_pwr))
return;
if (!hsw_pwr)
return -ENODEV;
dev_priv = container_of(hsw_pwr, struct drm_i915_private,
power_domains);
intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
return 0;
}
EXPORT_SYMBOL_GPL(i915_request_power_well);
/* Display audio driver power well release */
void i915_release_power_well(void)
int i915_release_power_well(void)
{
struct drm_i915_private *dev_priv;
if (WARN_ON(!hsw_pwr))
return;
if (!hsw_pwr)
return -ENODEV;
dev_priv = container_of(hsw_pwr, struct drm_i915_private,
power_domains);
intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
return 0;
}
EXPORT_SYMBOL_GPL(i915_release_power_well);

4
include/drm/i915_powerwell.h
View file

@ -30,7 +30,7 @@
#define _I915_POWERWELL_H_
/* For use by hda_i915 driver */
extern void i915_request_power_well(void);
extern void i915_release_power_well(void);
extern int i915_request_power_well(void);
extern int i915_release_power_well(void);
#endif /* _I915_POWERWELL_H_ */

12
sound/pci/hda/hda_i915.c
View file

@ -22,20 +22,20 @@
#include <drm/i915_powerwell.h>
#include "hda_i915.h"
static void (*get_power)(void);
static void (*put_power)(void);
static int (*get_power)(void);
static int (*put_power)(void);
void hda_display_power(bool enable)
int hda_display_power(bool enable)
{
if (!get_power || !put_power)
return;
return -ENODEV;
pr_debug("HDA display power %s \n",
enable ? "Enable" : "Disable");
if (enable)
get_power();
return get_power();
else
put_power();
return put_power();
}
int hda_i915_init(void)

4
sound/pci/hda/hda_i915.h
View file

@ -17,11 +17,11 @@
#define __SOUND_HDA_I915_H
#ifdef CONFIG_SND_HDA_I915
void hda_display_power(bool enable);
int hda_display_power(bool enable);
int hda_i915_init(void);
int hda_i915_exit(void);
#else
static inline void hda_display_power(bool enable) {}
static inline int hda_display_power(bool enable) { return 0; }
static inline int hda_i915_init(void)
{
return -ENODEV;

7
sound/pci/hda/hda_intel.c
View file

@ -1656,8 +1656,13 @@ static int azx_probe_continue(struct azx *chip)
"Error request power-well from i915\n");
goto out_free;
}
err = hda_display_power(true);
if (err < 0) {
dev_err(chip->card->dev,
"Cannot turn on display power on i915\n");
goto out_free;
}
#endif
hda_display_power(true);
}
err = azx_first_init(chip);