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ALSA: hda: Check the non-cached stream buffers more explicitly 

Introduce a new flag, uc_buffer, to indicate that the controller
requires the non-cached pages for stream buffers, either as a
chip-specific requirement or specified via snoop=0 option.
This improves the code-readability.

Also, this patch fixes the incorrect behavior for C-Media chip where
the stream buffers were never handled as non-cached due to the check
of driver_type even if you pass snoop=0 option.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-08-11 23:33:34 +02:00
parent 42e748a0b3
commit 78c9be61c3
2 changed files with 9 additions and 3 deletions
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1
sound/pci/hda/hda_controller.h
View File

@ -160,6 +160,7 @@ struct azx {
unsigned int msi:1;
unsigned int probing:1; /* codec probing phase */
unsigned int snoop:1;
unsigned int uc_buffer:1; /* non-cached pages for stream buffers */
unsigned int align_buffer_size:1;
unsigned int region_requested:1;
unsigned int disabled:1; /* disabled by vga_switcheroo */

11
sound/pci/hda/hda_intel.c
View File

@ -410,7 +410,7 @@ static void __mark_pages_wc(struct azx *chip, struct snd_dma_buffer *dmab, bool
#ifdef CONFIG_SND_DMA_SGBUF
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_SG) {
struct snd_sg_buf *sgbuf = dmab->private_data;
if (chip->driver_type == AZX_DRIVER_CMEDIA)
if (!chip->uc_buffer)
return; /* deal with only CORB/RIRB buffers */
if (on)
set_pages_array_wc(sgbuf->page_table, sgbuf->pages);
@ -1637,6 +1637,7 @@ static void azx_check_snoop_available(struct azx *chip)
dev_info(chip->card->dev, "Force to %s mode by module option\n",
snoop ? "snoop" : "non-snoop");
chip->snoop = snoop;
chip->uc_buffer = !snoop;
return;
}
@ -1657,8 +1658,12 @@ static void azx_check_snoop_available(struct azx *chip)
snoop = false;
chip->snoop = snoop;
if (!snoop)
if (!snoop) {
dev_info(chip->card->dev, "Force to non-snoop mode\n");
/* C-Media requires non-cached pages only for CORB/RIRB */
if (chip->driver_type != AZX_DRIVER_CMEDIA)
chip->uc_buffer = true;
}
}
static void azx_probe_work(struct work_struct *work)
@ -2097,7 +2102,7 @@ static void pcm_mmap_prepare(struct snd_pcm_substream *substream,
#ifdef CONFIG_X86
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
if (!azx_snoop(chip) && chip->driver_type != AZX_DRIVER_CMEDIA)
if (chip->uc_buffer)
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
#endif
}