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ALSA: hda: hdac_controller: Implement support for use_pio_for_commands mode

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In case the use_pio_for_commands flag is set we must not enable the
CORB DMA to make sure that it is not interfering with the immediate
command mode.

Convert the snd_hdac_bus_send_cmd/snd_hdac_bus_get_response as wrappers to
call either the PIO or CORB based command handling depending on the
use_pio_for_commands flag.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-ID: <20240409083812.14001-3-peter.ujfalusi@linux.intel.com>
This commit is contained in:
Peter Ujfalusi 2024-04-09 11:38:09 +03:00 committed by Takashi Iwai
parent a1de26c0b7
commit f81eb6e17d
1 changed files with 120 additions and 7 deletions
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125
sound/hda/hdac_controller.c
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@ -62,6 +62,7 @@ void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus)
azx_clear_corbrp(bus);
/* enable corb dma */
if (!bus->use_pio_for_commands)
snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN);
/* RIRB set up */
@ -135,14 +136,94 @@ static unsigned int azx_command_addr(u32 cmd)
return addr;
}
/* receive an Immediate Response with PIO */
static int snd_hdac_bus_wait_for_pio_response(struct hdac_bus *bus,
unsigned int addr)
{
int timeout = 50;
while (timeout--) {
/* check IRV bit */
if (snd_hdac_chip_readw(bus, IRS) & AZX_IRS_VALID) {
/* reuse rirb.res as the response return value */
bus->rirb.res[addr] = snd_hdac_chip_readl(bus, IR);
return 0;
}
udelay(1);
}
dev_dbg_ratelimited(bus->dev, "get_response_pio timeout: IRS=%#x\n",
snd_hdac_chip_readw(bus, IRS));
bus->rirb.res[addr] = -1;
return -EIO;
}
/**
* snd_hdac_bus_send_cmd - send a command verb via CORB
* snd_hdac_bus_send_cmd_pio - send a command verb via Immediate Command
* @bus: HD-audio core bus
* @val: encoded verb value to send
*
* Returns zero for success or a negative error code.
*/
int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
static int snd_hdac_bus_send_cmd_pio(struct hdac_bus *bus, unsigned int val)
{
unsigned int addr = azx_command_addr(val);
int timeout = 50;
int ret = -EIO;
spin_lock_irq(&bus->reg_lock);
while (timeout--) {
/* check ICB bit */
if (!((snd_hdac_chip_readw(bus, IRS) & AZX_IRS_BUSY))) {
/* Clear IRV bit */
snd_hdac_chip_updatew(bus, IRS, AZX_IRS_VALID, AZX_IRS_VALID);
snd_hdac_chip_writel(bus, IC, val);
/* Set ICB bit */
snd_hdac_chip_updatew(bus, IRS, AZX_IRS_BUSY, AZX_IRS_BUSY);
ret = snd_hdac_bus_wait_for_pio_response(bus, addr);
goto out;
}
udelay(1);
}
dev_dbg_ratelimited(bus->dev, "send_cmd_pio timeout: IRS=%#x, val=%#x\n",
snd_hdac_chip_readw(bus, IRS), val);
out:
spin_unlock_irq(&bus->reg_lock);
return ret;
}
/**
* snd_hdac_bus_get_response_pio - receive a response via Immediate Response
* @bus: HD-audio core bus
* @addr: codec address
* @res: pointer to store the value, NULL when not needed
*
* Returns zero if a value is read, or a negative error code.
*/
static int snd_hdac_bus_get_response_pio(struct hdac_bus *bus,
unsigned int addr, unsigned int *res)
{
if (res)
*res = bus->rirb.res[addr];
return 0;
}
/**
* snd_hdac_bus_send_cmd_corb - send a command verb via CORB
* @bus: HD-audio core bus
* @val: encoded verb value to send
*
* Returns zero for success or a negative error code.
*/
static int snd_hdac_bus_send_cmd_corb(struct hdac_bus *bus, unsigned int val)
{
unsigned int addr = azx_command_addr(val);
unsigned int wp, rp;
@ -176,7 +257,6 @@ int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);
#define AZX_RIRB_EX_UNSOL_EV (1<<4)
@ -234,15 +314,15 @@ void snd_hdac_bus_update_rirb(struct hdac_bus *bus)
EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb);
/**
* snd_hdac_bus_get_response - receive a response via RIRB
* snd_hdac_bus_get_response_rirb - receive a response via RIRB
* @bus: HD-audio core bus
* @addr: codec address
* @res: pointer to store the value, NULL when not needed
*
* Returns zero if a value is read, or a negative error code.
*/
int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
unsigned int *res)
static int snd_hdac_bus_get_response_rirb(struct hdac_bus *bus,
unsigned int addr, unsigned int *res)
{
unsigned long timeout;
unsigned long loopcounter;
@ -293,6 +373,39 @@ int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
return -EIO;
}
/**
* snd_hdac_bus_send_cmd - send a command verb via CORB or PIO
* @bus: HD-audio core bus
* @val: encoded verb value to send
*
* Returns zero for success or a negative error code.
*/
int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
{
if (bus->use_pio_for_commands)
return snd_hdac_bus_send_cmd_pio(bus, val);
return snd_hdac_bus_send_cmd_corb(bus, val);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);
/**
* snd_hdac_bus_get_response - receive a response via RIRB or PIO
* @bus: HD-audio core bus
* @addr: codec address
* @res: pointer to store the value, NULL when not needed
*
* Returns zero if a value is read, or a negative error code.
*/
int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
unsigned int *res)
{
if (bus->use_pio_for_commands)
return snd_hdac_bus_get_response_pio(bus, addr, res);
return snd_hdac_bus_get_response_rirb(bus, addr, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response);
#define HDAC_MAX_CAPS 10