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[ALSA] sparc dbri: SMP fixes

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The dbri driver hangs when used in kernel compiled with SMP
support due to inproper locking. The patch fixes it.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Krzysztof Helt 2006-09-05 20:25:05 +02:00 committed by Jaroslav Kysela
parent 679e28eef8
commit ea543f1ee6
1 changed files with 48 additions and 17 deletions
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65
sound/sparc/dbri.c
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@ -635,10 +635,16 @@ to send them to the DBRI.
static void dbri_cmdwait(struct snd_dbri *dbri)
{
int maxloops = MAXLOOPS;
unsigned long flags;
/* Delay if previous commands are still being processed */
while ((--maxloops) > 0 && (sbus_readl(dbri->regs + REG0) & D_P))
spin_lock_irqsave(&dbri->lock, flags);
while ((--maxloops) > 0 && (sbus_readl(dbri->regs + REG0) & D_P)) {
spin_unlock_irqrestore(&dbri->lock, flags);
msleep_interruptible(1);
spin_lock_irqsave(&dbri->lock, flags);
}
spin_unlock_irqrestore(&dbri->lock, flags);
if (maxloops == 0) {
printk(KERN_ERR "DBRI: Chip never completed command buffer\n");
@ -671,11 +677,12 @@ static s32 *dbri_cmdlock(struct snd_dbri * dbri, int len)
* the last WAIT cmd and force DBRI to reread the cmd.
* The JUMP cmd points to the new cmd string.
* It also releases the cmdlock spinlock.
*
* Lock must not be held before calling this.
*/
static void dbri_cmdsend(struct snd_dbri * dbri, s32 * cmd,int len)
{
s32 tmp, addr;
unsigned long flags;
static int wait_id = 0;
wait_id++;
@ -706,12 +713,10 @@ static void dbri_cmdsend(struct snd_dbri * dbri, s32 * cmd,int len)
}
#endif
spin_lock_irqsave(&dbri->lock, flags);
/* Reread the last command */
tmp = sbus_readl(dbri->regs + REG0);
tmp |= D_P;
sbus_writel(tmp, dbri->regs + REG0);
spin_unlock_irqrestore(&dbri->lock, flags);
dbri->cmdptr = cmd;
spin_unlock(&dbri->cmdlock);
@ -777,9 +782,9 @@ static void dbri_initialize(struct snd_dbri * dbri)
dma_addr = dbri->dma_dvma + dbri_dma_off(cmd, 0);
sbus_writel(dma_addr, dbri->regs + REG8);
spin_unlock(&dbri->cmdlock);
dbri_cmdwait(dbri);
spin_unlock_irqrestore(&dbri->lock, flags);
dbri_cmdwait(dbri);
}
/*
@ -840,6 +845,9 @@ static void reset_pipe(struct snd_dbri * dbri, int pipe)
dbri->pipes[pipe].first_desc = -1;
}
/*
* Lock must be held before calling this.
*/
static void setup_pipe(struct snd_dbri * dbri, int pipe, int sdp)
{
if (pipe < 0 || pipe > DBRI_MAX_PIPE) {
@ -866,6 +874,9 @@ static void setup_pipe(struct snd_dbri * dbri, int pipe, int sdp)
reset_pipe(dbri, pipe);
}
/*
* Lock must be held before calling this.
*/
static void link_time_slot(struct snd_dbri * dbri, int pipe,
int prevpipe, int nextpipe,
int length, int cycle)
@ -920,6 +931,10 @@ static void link_time_slot(struct snd_dbri * dbri, int pipe,
dbri_cmdsend(dbri, cmd, 4);
}
#if 0
/*
* Lock must be held before calling this.
*/
static void unlink_time_slot(struct snd_dbri * dbri, int pipe,
enum in_or_out direction, int prevpipe,
int nextpipe)
@ -952,6 +967,7 @@ static void unlink_time_slot(struct snd_dbri * dbri, int pipe,
dbri_cmdsend(dbri, cmd, 4);
}
#endif
/* xmit_fixed() / recv_fixed()
*
@ -965,11 +981,14 @@ static void unlink_time_slot(struct snd_dbri * dbri, int pipe,
* the actual time slot is. The interrupt handler takes care of bit
* ordering and alignment. An 8-bit time slot will always end up
* in the low-order 8 bits, filled either MSB-first or LSB-first,
* depending on the settings passed to setup_pipe()
* depending on the settings passed to setup_pipe().
*
* Lock must not be held before calling it.
*/
static void xmit_fixed(struct snd_dbri * dbri, int pipe, unsigned int data)
{
s32 *cmd;
unsigned long flags;
if (pipe < 16 || pipe > DBRI_MAX_PIPE) {
printk(KERN_ERR "DBRI: xmit_fixed: Illegal pipe number\n");
@ -1002,8 +1021,11 @@ static void xmit_fixed(struct snd_dbri * dbri, int pipe, unsigned int data)
*(cmd++) = data;
*(cmd++) = DBRI_CMD(D_PAUSE, 0, 0);
spin_lock_irqsave(&dbri->lock, flags);
dbri_cmdsend(dbri, cmd, 3);
spin_unlock_irqrestore(&dbri->lock, flags);
dbri_cmdwait(dbri);
}
static void recv_fixed(struct snd_dbri * dbri, int pipe, volatile __u32 * ptr)
@ -1039,6 +1061,8 @@ static void recv_fixed(struct snd_dbri * dbri, int pipe, volatile __u32 * ptr)
* be spread across multiple descriptors.
*
* All descriptors create a ring buffer.
*
* Lock must be held before calling this.
*/
static int setup_descs(struct snd_dbri * dbri, int streamno, unsigned int period)
{
@ -1186,6 +1210,9 @@ multiplexed serial interface which the DBRI can operate in either master
enum master_or_slave { CHImaster, CHIslave };
/*
* Lock must not be held before calling it.
*/
static void reset_chi(struct snd_dbri * dbri, enum master_or_slave master_or_slave,
int bits_per_frame)
{
@ -1258,9 +1285,14 @@ static void reset_chi(struct snd_dbri * dbri, enum master_or_slave master_or_sla
In the standard SPARC audio configuration, the CS4215 codec is attached
to the DBRI via the CHI interface and few of the DBRI's PIO pins.
* Lock must not be held before calling it.
*/
static void cs4215_setup_pipes(struct snd_dbri * dbri)
{
unsigned long flags;
spin_lock_irqsave(&dbri->lock, flags);
/*
* Data mode:
* Pipe 4: Send timeslots 1-4 (audio data)
@ -1284,6 +1316,7 @@ static void cs4215_setup_pipes(struct snd_dbri * dbri)
setup_pipe(dbri, 17, D_SDP_FIXED | D_SDP_TO_SER | D_SDP_MSB);
setup_pipe(dbri, 18, D_SDP_FIXED | D_SDP_FROM_SER | D_SDP_MSB);
setup_pipe(dbri, 19, D_SDP_FIXED | D_SDP_FROM_SER | D_SDP_MSB);
spin_unlock_irqrestore(&dbri->lock, flags);
dbri_cmdwait(dbri);
}
@ -1358,6 +1391,7 @@ static void cs4215_open(struct snd_dbri * dbri)
{
int data_width;
u32 tmp;
unsigned long flags;
dprintk(D_MM, "cs4215_open: %d channels, %d bits\n",
dbri->mm.channels, dbri->mm.precision);
@ -1382,6 +1416,7 @@ static void cs4215_open(struct snd_dbri * dbri)
* bits. The CS4215, it seems, observes TSIN (the delayed signal)
* even if it's the CHI master. Don't ask me...
*/
spin_lock_irqsave(&dbri->lock, flags);
tmp = sbus_readl(dbri->regs + REG0);
tmp &= ~(D_C); /* Disable CHI */
sbus_writel(tmp, dbri->regs + REG0);
@ -1409,6 +1444,7 @@ static void cs4215_open(struct snd_dbri * dbri)
tmp = sbus_readl(dbri->regs + REG0);
tmp |= D_C; /* Enable CHI */
sbus_writel(tmp, dbri->regs + REG0);
spin_unlock_irqrestore(&dbri->lock, flags);
cs4215_setdata(dbri, 0);
}
@ -1420,6 +1456,7 @@ static int cs4215_setctrl(struct snd_dbri * dbri)
{
int i, val;
u32 tmp;
unsigned long flags;
/* FIXME - let the CPU do something useful during these delays */
@ -1456,6 +1493,7 @@ static int cs4215_setctrl(struct snd_dbri * dbri)
* done in hardware by a TI 248 that delays the DBRI->4215
* frame sync signal by eight clock cycles. Anybody know why?
*/
spin_lock_irqsave(&dbri->lock, flags);
tmp = sbus_readl(dbri->regs + REG0);
tmp &= ~D_C; /* Disable CHI */
sbus_writel(tmp, dbri->regs + REG0);
@ -1472,14 +1510,17 @@ static int cs4215_setctrl(struct snd_dbri * dbri)
link_time_slot(dbri, 17, 16, 16, 32, dbri->mm.offset);
link_time_slot(dbri, 18, 16, 16, 8, dbri->mm.offset);
link_time_slot(dbri, 19, 18, 16, 8, dbri->mm.offset + 48);
spin_unlock_irqrestore(&dbri->lock, flags);
/* Wait for the chip to echo back CLB (Control Latch Bit) as zero */
dbri->mm.ctrl[0] &= ~CS4215_CLB;
xmit_fixed(dbri, 17, *(int *)dbri->mm.ctrl);
spin_lock_irqsave(&dbri->lock, flags);
tmp = sbus_readl(dbri->regs + REG0);
tmp |= D_C; /* Enable CHI */
sbus_writel(tmp, dbri->regs + REG0);
spin_unlock_irqrestore(&dbri->lock, flags);
for (i = 10; ((dbri->mm.status & 0xe4) != 0x20); --i) {
msleep_interruptible(1);
@ -1688,6 +1729,7 @@ static void xmit_descs(struct snd_dbri *dbri)
dbri->pipes[info->pipe].desc = first_td;
}
}
spin_unlock_irqrestore(&dbri->lock, flags);
}
@ -2093,7 +2135,6 @@ static int snd_dbri_prepare(struct snd_pcm_substream *substream)
{
struct snd_dbri *dbri = snd_pcm_substream_chip(substream);
struct dbri_streaminfo *info = DBRI_STREAM(dbri, substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int ret;
info->size = snd_pcm_lib_buffer_bytes(substream);
@ -2232,7 +2273,6 @@ static int snd_cs4215_put_volume(struct snd_kcontrol *kcontrol,
{
struct snd_dbri *dbri = snd_kcontrol_chip(kcontrol);
struct dbri_streaminfo *info = &dbri->stream_info[kcontrol->private_value];
unsigned long flags;
int changed = 0;
if (info->left_gain != ucontrol->value.integer.value[0]) {
@ -2247,13 +2287,9 @@ static int snd_cs4215_put_volume(struct snd_kcontrol *kcontrol,
/* First mute outputs, and wait 1/8000 sec (125 us)
* to make sure this takes. This avoids clicking noises.
*/
spin_lock_irqsave(&dbri->lock, flags);
cs4215_setdata(dbri, 1);
udelay(125);
cs4215_setdata(dbri, 0);
spin_unlock_irqrestore(&dbri->lock, flags);
}
return changed;
}
@ -2300,7 +2336,6 @@ static int snd_cs4215_put_single(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dbri *dbri = snd_kcontrol_chip(kcontrol);
unsigned long flags;
int elem = kcontrol->private_value & 0xff;
int shift = (kcontrol->private_value >> 8) & 0xff;
int mask = (kcontrol->private_value >> 16) & 0xff;
@ -2333,13 +2368,9 @@ static int snd_cs4215_put_single(struct snd_kcontrol *kcontrol,
/* First mute outputs, and wait 1/8000 sec (125 us)
* to make sure this takes. This avoids clicking noises.
*/
spin_lock_irqsave(&dbri->lock, flags);
cs4215_setdata(dbri, 1);
udelay(125);
cs4215_setdata(dbri, 0);
spin_unlock_irqrestore(&dbri->lock, flags);
}
return changed;
}