Commit e4d9e513 authored by Mengdong Lin's avatar Mengdong Lin Committed by Takashi Iwai
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ALSA: hda - restore BCLK M/N value as per CDCLK for HSW/BDW display HDA controller 



For HSW/BDW display HD-A controller, hda_set_bclk() is defined to set BCLK
by programming the M/N values as per the core display clock (CDCLK) queried from
i915 display driver.

And the audio driver will also set BCLK in azx_first_init() since the display
driver can turn off the shared power in boot phase if only eDP is connected
and M/N values will be lost and must be reprogrammed.

Signed-off-by: default avatarMengdong Lin <mengdong.lin@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent c149dcb5

sound/pci/hda/hda_i915.c

+55 −0
Original line number Diff line number Diff line
@@ -20,10 +20,20 @@ 
#include <linux/module.h>

#include <sound/core.h>

#include <drm/i915_powerwell.h>

#include "hda_priv.h"

#include "hda_i915.h"



/* Intel HSW/BDW display HDA controller Extended Mode registers.

 * EM4 (M value) and EM5 (N Value) are used to convert CDClk (Core Display

 * Clock) to 24MHz BCLK: BCLK = CDCLK * M / N

 * The values will be lost when the display power well is disabled.

 */

#define ICH6_REG_EM4			0x100c

#define ICH6_REG_EM5			0x1010



static int (*get_power)(void);

static int (*put_power)(void);

static int (*get_cdclk)(void);



int hda_display_power(bool enable)

{
@@ -38,6 +48,43 @@ int hda_display_power(bool enable) 
		return put_power();

}



void haswell_set_bclk(struct azx *chip)

{

	int cdclk_freq;

	unsigned int bclk_m, bclk_n;



	if (!get_cdclk)

		return;



	cdclk_freq = get_cdclk();

	switch (cdclk_freq) {

	case 337500:

		bclk_m = 16;

		bclk_n = 225;

		break;



	case 450000:

	default: /* default CDCLK 450MHz */

		bclk_m = 4;

		bclk_n = 75;

		break;



	case 540000:

		bclk_m = 4;

		bclk_n = 90;

		break;



	case 675000:

		bclk_m = 8;

		bclk_n = 225;

		break;

	}



	azx_writew(chip, EM4, bclk_m);

	azx_writew(chip, EM5, bclk_n);

}





int hda_i915_init(void)

{

	int err = 0;
@@ -55,6 +102,10 @@ int hda_i915_init(void) 
		return -ENODEV;

	}



	get_cdclk = symbol_request(i915_get_cdclk_freq);

	if (!get_cdclk)	/* may have abnormal BCLK and audio playback rate */

		pr_warn("hda-i915: get_cdclk symbol get fail\n");



	pr_debug("HDA driver get symbol successfully from i915 module\n");



	return err;
@@ -70,6 +121,10 @@ int hda_i915_exit(void) 
		symbol_put(i915_release_power_well);

		put_power = NULL;

	}

	if (get_cdclk) {

		symbol_put(i915_get_cdclk_freq);

		get_cdclk = NULL;

	}



	return 0;

}

sound/pci/hda/hda_i915.h

+2 −0
Original line number Diff line number Diff line
@@ -18,10 +18,12 @@ 


#ifdef CONFIG_SND_HDA_I915

int hda_display_power(bool enable);

void haswell_set_bclk(struct azx *chip);

int hda_i915_init(void);

int hda_i915_exit(void);

#else

static inline int hda_display_power(bool enable) { return 0; }

static inline void haswell_set_bclk(struct azx *chip) { return; }

static inline int hda_i915_init(void)

{

	return -ENODEV;

sound/pci/hda/hda_intel.c

+9 −41
Original line number Diff line number Diff line
@@ -62,9 +62,9 @@ 
#include <linux/vga_switcheroo.h>

#include <linux/firmware.h>

#include "hda_codec.h"

#include "hda_i915.h"

#include "hda_controller.h"

#include "hda_priv.h"

#include "hda_i915.h"





static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
@@ -288,21 +288,8 @@ static char *driver_short_names[] = { 
	[AZX_DRIVER_GENERIC] = "HD-Audio Generic",

};





/* Intel HSW/BDW display HDA controller Extended Mode registers.

 * EM4 (M value) and EM5 (N Value) are used to convert CDClk (Core Display

 * Clock) to 24MHz BCLK: BCLK = CDCLK * M / N

 * The values will be lost when the display power well is disabled.

 */

#define ICH6_REG_EM4			0x100c

#define ICH6_REG_EM5			0x1010



struct hda_intel {

	struct azx chip;



	/* HSW/BDW display HDA controller to restore BCLK from CDCLK */

	unsigned int bclk_m;

	unsigned int bclk_n;

};
@@ -598,22 +585,6 @@ static int param_set_xint(const char *val, const struct kernel_param *kp) 
#define azx_del_card_list(chip) /* NOP */

#endif /* CONFIG_PM */



static void haswell_save_bclk(struct azx *chip)

{

	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);



	hda->bclk_m = azx_readw(chip, EM4);

	hda->bclk_n = azx_readw(chip, EM5);

}



static void haswell_restore_bclk(struct azx *chip)

{

	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);



	azx_writew(chip, EM4, hda->bclk_m);

	azx_writew(chip, EM5, hda->bclk_n);

}



#if defined(CONFIG_PM_SLEEP) || defined(SUPPORT_VGA_SWITCHEROO)

/*

 * power management
@@ -641,12 +612,6 @@ static int azx_suspend(struct device *dev) 
		chip->irq = -1;

	}



	/* Save BCLK M/N values before they become invalid in D3.

	 * Will test if display power well can be released now.

	 */

	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)

		haswell_save_bclk(chip);



	if (chip->msi)

		pci_disable_msi(chip->pci);

	pci_disable_device(pci);
@@ -668,7 +633,7 @@ static int azx_resume(struct device *dev) 


	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {

		hda_display_power(true);

		haswell_restore_bclk(chip);

		haswell_set_bclk(chip);

	}

	pci_set_power_state(pci, PCI_D0);

	pci_restore_state(pci);
@@ -713,10 +678,9 @@ static int azx_runtime_suspend(struct device *dev) 
	azx_stop_chip(chip);

	azx_enter_link_reset(chip);

	azx_clear_irq_pending(chip);

	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {

		haswell_save_bclk(chip);

	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)

		hda_display_power(false);

	}



	return 0;

}
@@ -736,7 +700,7 @@ static int azx_runtime_resume(struct device *dev) 


	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {

		hda_display_power(true);

		haswell_restore_bclk(chip);

		haswell_set_bclk(chip);

	}



	/* Read STATESTS before controller reset */
@@ -1426,6 +1390,10 @@ static int azx_first_init(struct azx *chip) 


	/* initialize chip */

	azx_init_pci(chip);



	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)

		haswell_set_bclk(chip);



	azx_init_chip(chip, (probe_only[dev] & 2) == 0);



	/* codec detection */

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