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ALSA: hda - Handle error from get_response bus ops directly

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... and drop bus->rirb_error flag.  This makes the code simpler.

We treat -EAGAIN from get_response ops as a special meaning: it allows
the caller to retry after bus reset.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-03-25 17:57:00 +01:00
parent d6eb9e3ec7
commit cad372f1be
3 changed files with 32 additions and 35 deletions
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17
sound/pci/hda/hda_codec.c
View File

@ -146,7 +146,7 @@ static int codec_exec_verb(struct hdac_device *dev, unsigned int cmd,
bus->no_response_fallback = 0;
mutex_unlock(&bus->core.cmd_mutex);
snd_hda_power_down_pm(codec);
if (!codec_in_pm(codec) && res && err < 0 && bus->rirb_error) {
if (!codec_in_pm(codec) && res && err == -EAGAIN) {
if (bus->response_reset) {
codec_dbg(codec,
"resetting BUS due to fatal communication error\n");
@ -436,9 +436,8 @@ static unsigned int get_num_devices(struct hda_codec *codec, hda_nid_t nid)
get_wcaps_type(wcaps) != AC_WID_PIN)
return 0;
parm = snd_hda_param_read(codec, nid, AC_PAR_DEVLIST_LEN);
if (parm == -1 && codec->bus->rirb_error)
parm = 0;
if (_snd_hdac_read_parm(&codec->core, nid, AC_PAR_DEVLIST_LEN, &parm))
return 0; /* error */
return parm & AC_DEV_LIST_LEN_MASK;
}
@ -467,10 +466,9 @@ int snd_hda_get_devices(struct hda_codec *codec, hda_nid_t nid,
devices = 0;
while (devices < dev_len) {
parm = snd_hda_codec_read(codec, nid, 0,
AC_VERB_GET_DEVICE_LIST, devices);
if (parm == -1 && codec->bus->rirb_error)
break;
if (snd_hdac_read(&codec->core, nid,
AC_VERB_GET_DEVICE_LIST, devices, &parm))
break; /* error */
for (i = 0; i < 8; i++) {
dev_list[devices] = (u8)parm;
@ -520,8 +518,7 @@ static int _hda_bus_get_response(struct hdac_bus *_bus, unsigned int addr,
unsigned int *res)
{
struct hda_bus *bus = container_of(_bus, struct hda_bus, core);
*res = bus->ops.get_response(bus, addr);
return bus->rirb_error ? -EIO : 0;
return bus->ops.get_response(bus, addr, res);
}
static const struct hdac_bus_ops bus_ops = {

3
sound/pci/hda/hda_codec.h
View File

@ -45,7 +45,7 @@ struct hda_bus_ops {
/* send a single command */
int (*command)(struct hda_bus *bus, unsigned int cmd);
/* get a response from the last command */
unsigned int (*get_response)(struct hda_bus *bus, unsigned int addr);
int (*get_response)(struct hda_bus *bus, unsigned int addr, unsigned int *res);
/* free the private data */
void (*private_free)(struct hda_bus *);
/* attach a PCM stream */
@ -92,7 +92,6 @@ struct hda_bus {
unsigned int allow_bus_reset:1; /* allow bus reset at fatal error */
/* status for codec/controller */
unsigned int shutdown :1; /* being unloaded */
unsigned int rirb_error:1; /* error in codec communication */
unsigned int response_reset:1; /* controller was reset */
unsigned int in_reset:1; /* during reset operation */
unsigned int no_response_fallback:1; /* don't fallback at RIRB error */

47
sound/pci/hda/hda_controller.c
View File

@ -1156,8 +1156,8 @@ static void azx_update_rirb(struct azx *chip)
}
/* receive a response */
static unsigned int azx_rirb_get_response(struct hda_bus *bus,
unsigned int addr)
static int azx_rirb_get_response(struct hda_bus *bus, unsigned int addr,
unsigned int *res)
{
struct azx *chip = bus->private_data;
unsigned long timeout;
@ -1175,11 +1175,12 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
}
if (!chip->rirb.cmds[addr]) {
smp_rmb();
bus->rirb_error = 0;
if (!do_poll)
chip->poll_count = 0;
return chip->rirb.res[addr]; /* the last value */
if (res)
*res = chip->rirb.res[addr]; /* the last value */
return 0;
}
if (time_after(jiffies, timeout))
break;
@ -1192,7 +1193,7 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
}
if (bus->no_response_fallback)
return -1;
return -EIO;
if (!chip->polling_mode && chip->poll_count < 2) {
dev_dbg(chip->card->dev,
@ -1217,10 +1218,8 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
"No response from codec, disabling MSI: last cmd=0x%08x\n",
chip->last_cmd[addr]);
if (chip->ops->disable_msi_reset_irq(chip) &&
chip->ops->disable_msi_reset_irq(chip) < 0) {
bus->rirb_error = 1;
return -1;
}
chip->ops->disable_msi_reset_irq(chip) < 0)
return -EIO;
goto again;
}
@ -1229,16 +1228,15 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
* phase, this is likely an access to a non-existing codec
* slot. Better to return an error and reset the system.
*/
return -1;
return -EIO;
}
/* a fatal communication error; need either to reset or to fallback
* to the single_cmd mode
*/
bus->rirb_error = 1;
if (bus->allow_bus_reset && !bus->response_reset && !bus->in_reset) {
bus->response_reset = 1;
return -1; /* give a chance to retry */
return -EAGAIN; /* give a chance to retry */
}
dev_err(chip->card->dev,
@ -1250,7 +1248,7 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
azx_free_cmd_io(chip);
/* disable unsolicited responses */
azx_writel(chip, GCTL, azx_readl(chip, GCTL) & ~AZX_GCTL_UNSOL);
return -1;
return -EIO;
}
/*
@ -1291,7 +1289,6 @@ static int azx_single_send_cmd(struct hda_bus *bus, u32 val)
unsigned int addr = azx_command_addr(val);
int timeout = 50;
bus->rirb_error = 0;
while (timeout--) {
/* check ICB busy bit */
if (!((azx_readw(chip, IRS) & AZX_IRS_BUSY))) {
@ -1313,11 +1310,14 @@ static int azx_single_send_cmd(struct hda_bus *bus, u32 val)
}
/* receive a response */
static unsigned int azx_single_get_response(struct hda_bus *bus,
unsigned int addr)
static int azx_single_get_response(struct hda_bus *bus, unsigned int addr,
unsigned int *res)
{
struct azx *chip = bus->private_data;
return chip->rirb.res[addr];
if (res)
*res = chip->rirb.res[addr];
return 0;
}
/*
@ -1342,16 +1342,16 @@ static int azx_send_cmd(struct hda_bus *bus, unsigned int val)
}
/* get a response */
static unsigned int azx_get_response(struct hda_bus *bus,
unsigned int addr)
static int azx_get_response(struct hda_bus *bus, unsigned int addr,
unsigned int *res)
{
struct azx *chip = bus->private_data;
if (chip->disabled)
return 0;
if (chip->single_cmd)
return azx_single_get_response(bus, addr);
return azx_single_get_response(bus, addr, res);
else
return azx_rirb_get_response(bus, addr);
return azx_rirb_get_response(bus, addr, res);
}
#ifdef CONFIG_SND_HDA_DSP_LOADER
@ -1762,15 +1762,16 @@ static int probe_codec(struct azx *chip, int addr)
{
unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
(AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
int err;
unsigned int res;
mutex_lock(&chip->bus->core.cmd_mutex);
chip->probing = 1;
azx_send_cmd(chip->bus, cmd);
res = azx_get_response(chip->bus, addr);
err = azx_get_response(chip->bus, addr, &res);
chip->probing = 0;
mutex_unlock(&chip->bus->core.cmd_mutex);
if (res == -1)
if (err < 0 || res == -1)
return -EIO;
dev_dbg(chip->card->dev, "codec #%d probed OK\n", addr);
return 0;