Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 17eccb27 authored by Mengdong Lin's avatar Mengdong Lin Committed by Takashi Iwai
Browse files

ALSA: hda - implement link_power ops for i915 display power control 



This patch implements the bus link_power ops to request/release i915 display
power well. It can be used by the display codec which shares this power well
with GPU on Intel platforms.

Signed-off-by: default avatarMengdong Lin <mengdong.lin@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent a5e7e07c

sound/pci/hda/hda_controller.c

+11 −0
Original line number Diff line number Diff line
@@ -775,9 +775,20 @@ static int azx_get_response(struct hdac_bus *bus, unsigned int addr, 
		return azx_rirb_get_response(bus, addr, res);

}



static int azx_link_power(struct hdac_bus *bus, bool enable)

{

	struct azx *chip = bus_to_azx(bus);



	if (chip->ops->link_power)

		return chip->ops->link_power(chip, enable);

	else

		return -EINVAL;

}



static const struct hdac_bus_ops bus_core_ops = {

	.command = azx_send_cmd,

	.get_response = azx_get_response,

	.link_power = azx_link_power,

};



#ifdef CONFIG_SND_HDA_DSP_LOADER

sound/pci/hda/hda_controller.h

+2 −0
Original line number Diff line number Diff line
@@ -89,6 +89,8 @@ struct hda_controller_ops { 
				 struct vm_area_struct *area);

	/* Check if current position is acceptable */

	int (*position_check)(struct azx *chip, struct azx_dev *azx_dev);

	/* enable/disable the link power */

	int (*link_power)(struct azx *chip, bool enable);

};



struct azx_pcm {

sound/pci/hda/hda_intel.c

+9 −0
Original line number Diff line number Diff line
@@ -540,6 +540,14 @@ static int azx_position_check(struct azx *chip, struct azx_dev *azx_dev) 
	return 0;

}



/* Enable/disable i915 display power for the link */

static int azx_intel_link_power(struct azx *chip, bool enable)

{

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



	return hda_display_power(hda, enable);

}



/*

 * Check whether the current DMA position is acceptable for updating

 * periods.  Returns non-zero if it's OK.
@@ -1786,6 +1794,7 @@ static const struct hda_controller_ops pci_hda_ops = { 
	.substream_free_pages = substream_free_pages,

	.pcm_mmap_prepare = pcm_mmap_prepare,

	.position_check = azx_position_check,

	.link_power = azx_intel_link_power,

};



static int azx_probe(struct pci_dev *pci,