I915 module maybe loaded after snd_hda_intel, the power-well
API doesnot exist in such case. This patch intended to avoid
loading dependency between snd-hda-intel and i915 module.
Signed-off-by: Wang Xingchao <xingchao.w...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_dma.c | 3 ++
drivers/gpu/drm/i915/intel_drv.h | 2 ++
drivers/gpu/drm/i915/intel_pm.c | 12 +++++++
include/drm/i915_powerwell.h | 1 +
sound/pci/hda/hda_i915.c | 69 ++++++++++++++++++++++++--------------
sound/pci/hda/hda_i915.h | 5 +++
sound/pci/hda/hda_intel.c | 8 +++--
7 files changed, 72 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a1648eb..307ca4b 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1671,6 +1671,9 @@ int i915_driver_load(struct drm_device *dev, unsigned
long flags)
if (IS_GEN5(dev))
intel_gpu_ips_init(dev_priv);
+ if (IS_HASWELL(dev))
+ intel_gpu_audio_init();
+
return 0;
out_gem_unload:
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index dfcf546..f159f12 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -758,6 +758,8 @@ extern void intel_update_fbc(struct drm_device *dev);
/* IPS */
extern void intel_gpu_ips_init(struct drm_i915_private *dev_priv);
extern void intel_gpu_ips_teardown(void);
+/* Display audio */
+extern void intel_gpu_audio_init(void);
extern bool intel_using_power_well(struct drm_device *dev);
extern void intel_init_power_well(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 642c4b6..8c1df21 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -29,6 +29,7 @@
#include "i915_drv.h"
#include "intel_drv.h"
#include "../../../platform/x86/intel_ips.h"
+#include "../../../../sound/pci/hda/hda_i915.h"
#include <linux/module.h>
#define FORCEWAKE_ACK_TIMEOUT_MS 2
@@ -4393,6 +4394,17 @@ struct i915_power_well_user {
struct list_head list;
};
+void intel_gpu_audio_init(void)
+{
+ void (*link)(void);
+
+ link = symbol_get(audio_link_to_i915_driver);
+ if (link) {
+ link();
+ symbol_put(audio_link_to_i915_driver);
+ }
+}
+
void i915_request_power_well(const char *name)
{
struct i915_power_well_user *user;
diff --git a/include/drm/i915_powerwell.h b/include/drm/i915_powerwell.h
index 87e0a2e..de03dc8 100644
--- a/include/drm/i915_powerwell.h
+++ b/include/drm/i915_powerwell.h
@@ -33,6 +33,7 @@
#ifndef _I915_POWERWELL_H_
#define _I915_POWERWELL_H_
+/* For use by hda_i915 driver */
extern void i915_request_power_well(const char *name);
extern void i915_release_power_well(const char *name);
diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c
index edf1a08..d11f255 100644
--- a/sound/pci/hda/hda_i915.c
+++ b/sound/pci/hda/hda_i915.c
@@ -22,54 +22,71 @@
#include <drm/i915_powerwell.h>
#include "hda_i915.h"
-const char *name = "i915";
-static void (*get_power)(const char *name);
-static void (*put_power)(const char *name);
+char *module_name = "i915";
+void (*get_power)(const char *);
+void (*put_power)(const char *);
+static bool hsw_i915_load;
+
+void audio_link_to_i915_driver(void)
+{
+ /* it's time to try getting the symbols again.*/
+ hsw_i915_load = true;
+}
+EXPORT_SYMBOL_GPL(audio_link_to_i915_driver);
/* Power well has impact on Haswell controller and codecs */
void hda_display_power(bool enable)
{
- snd_printk(KERN_INFO "HDA display power %s \n", enable ? "Enable" :
"Disable");
-
- if (!get_power || !put_power)
- return;
+ if (!get_power || !put_power) {
+ if (hsw_i915_load) {
+ get_power = i915_request_power_well;
+ put_power = i915_release_power_well;
+ } else
+ return;
+ }
+ snd_printk(KERN_DEBUG "HDA display power %s \n",
+ enable ? "Enable" : "Disable");
if (enable)
get_power("hda");
else
put_power("hda");
}
-EXPORT_SYMBOL(hda_display_power);
+EXPORT_SYMBOL_GPL(hda_display_power);
-static int __init hda_i915_init(void)
+/* In case i915 module loaded first, the APIs are there.
+ * Otherwise wait until i915 module notify us. */
+int hda_i915_init(void)
{
- struct module *i915;
- mutex_lock(&module_mutex);
- i915 = find_module(name);
- mutex_unlock(&module_mutex);
+ struct module *i915;
- if (!i915)
- request_module_nowait(name);
+ mutex_lock(&module_mutex);
+ i915 = find_module(module_name);
+ mutex_unlock(&module_mutex);
- if (!try_module_get(i915))
- return -EFAULT;
+ if (!i915)
+ request_module_nowait(module_name);
get_power = symbol_get(i915_request_power_well);
+ if (!get_power)
+ goto out;
+
put_power = symbol_get(i915_release_power_well);
+ if (!put_power)
+ goto out;
- module_put(i915);
+ snd_printk(KERN_DEBUG "HDA driver get symbol successfully from i915
module\n");
+out:
return 0;
}
+EXPORT_SYMBOL_GPL(hda_i915_init);
-#if 0
-static void __exit hda_i915_exit(void)
+int hda_i915_exit(void)
{
- drm_pci_exit(&driver, &i915_pci_driver);
+ symbol_put(i915_request_power_well);
+ symbol_put(i915_release_power_well);
}
+EXPORT_SYMBOL_GPL(hda_i915_exit);
-module_init(hda_i915_init);
-module_exit(hda_i915_exit);
-#endif
-module_init(hda_i915_init);
-MODULE_DESCRIPTION("HDA power well");
+MODULE_DESCRIPTION("HDA power well For Haswell");
MODULE_LICENSE("GPL");
diff --git a/sound/pci/hda/hda_i915.h b/sound/pci/hda/hda_i915.h
index a7e5324..b0516ab 100644
--- a/sound/pci/hda/hda_i915.h
+++ b/sound/pci/hda/hda_i915.h
@@ -3,8 +3,13 @@
#ifdef CONFIG_SND_HDA_I915
void hda_display_power(bool enable);
+int hda_i915_init(void);
+int hda_i915_exit(void);
#else
void hda_display_power(bool enable) {}
+int hda_i915_init(void) {}
+int hda_i915_exit(void) {}
#endif
+void audio_link_to_i915_driver(void);
#endif
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 8bb6075..431027d 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -3684,8 +3684,10 @@ static int azx_probe(struct pci_dev *pci,
return -ENOENT;
}
- if (IS_HSW(pci))
+ if (IS_HSW(pci)) {
+ hda_i915_init();
hda_display_power(true);
+ }
err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
if (err < 0) {
@@ -3822,8 +3824,10 @@ static void azx_remove(struct pci_dev *pci)
if (card)
snd_card_free(card);
pci_set_drvdata(pci, NULL);
- if (IS_HSW(pci))
+ if (IS_HSW(pci)) {
hda_display_power(false);
+ hda_i915_exit();
+ }
}
/* PCI IDs */
--
1.7.9.5
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