xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ALSA: hdac: Add support for hda DMA Resume capability

Browse Source 
Skylake sports new capability of DMA resume, DRSM where we can
resume the DMA. This capability is defined by presence of
AZX_DRSM_CAP_ID.

If this capability is present, we use this capability.
So we add:

snd_hdac_ext_stream_drsm_enable() - DMA resume caps
snd_hdac_ext_stream_set_dpibr() - set the DMA position
snd_hdac_ext_stream_set_lpib() - set the lpib

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jeeja KP
2015-12-18 15:11:59 +05:30
committed by Mark Brown
parent 1e83b0475a
commit a9c48f7f59
4 changed files with 100 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
sound/hda/ext/hdac_ext_controller.c
View File

@@ -77,6 +77,12 @@ int snd_hdac_ext_bus_parse_capabilities(struct hdac_ext_bus *ebus)
ebus->spbcap = bus->remap_addr + offset;
break;
case AZX_DRSM_CAP_ID:
/* DMA resume capability found, handler function */
dev_dbg(bus->dev, "Found DRSM capability\n");
ebus->drsmcap = bus->remap_addr + offset;
break;
default:
dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
break;

71
sound/hda/ext/hdac_ext_stream.c
View File

@@ -59,6 +59,10 @@ void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
AZX_SPB_MAXFIFO;
}
if (ebus->drsmcap)
stream->dpibr_addr = ebus->drsmcap + AZX_DRSM_BASE +
AZX_DRSM_INTERVAL * idx;
stream->decoupled = false;
snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
}
@@ -497,3 +501,70 @@ void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
}
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);
/**
* snd_hdac_ext_stream_drsm_enable - enable DMA resume for a stream
* @ebus: HD-audio ext core bus
* @enable: flag to enable/disable DRSM
* @index: stream index for which DRSM need to be enabled
*/
void snd_hdac_ext_stream_drsm_enable(struct hdac_ext_bus *ebus,
bool enable, int index)
{
u32 mask = 0;
u32 register_mask = 0;
struct hdac_bus *bus = &ebus->bus;
if (!ebus->drsmcap) {
dev_err(bus->dev, "Address of DRSM capability is NULL");
return;
}
mask |= (1 << index);
register_mask = readl(ebus->drsmcap + AZX_REG_SPB_SPBFCCTL);
mask |= register_mask;
if (enable)
snd_hdac_updatel(ebus->drsmcap, AZX_REG_DRSM_CTL, 0, mask);
else
snd_hdac_updatel(ebus->drsmcap, AZX_REG_DRSM_CTL, mask, 0);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_drsm_enable);
/**
* snd_hdac_ext_stream_set_dpibr - sets the dpibr value of a stream
* @ebus: HD-audio ext core bus
* @stream: hdac_ext_stream
* @value: dpib value to set
*/
int snd_hdac_ext_stream_set_dpibr(struct hdac_ext_bus *ebus,
struct hdac_ext_stream *stream, u32 value)
{
struct hdac_bus *bus = &ebus->bus;
if (!ebus->drsmcap) {
dev_err(bus->dev, "Address of DRSM capability is NULL");
return -EINVAL;
}
writel(value, stream->dpibr_addr);
return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_dpibr);
/**
* snd_hdac_ext_stream_set_lpib - sets the lpib value of a stream
* @ebus: HD-audio ext core bus
* @stream: hdac_ext_stream
* @value: lpib value to set
*/
int snd_hdac_ext_stream_set_lpib(struct hdac_ext_stream *stream, u32 value)
{
snd_hdac_stream_writel(&stream->hstream, SD_LPIB, value);
return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_lpib);