2 bytes in MSB of register for clock status is zero during intermediate state after changing status of sampling clock in models of TASCAM FireWire series. The duration of this state differs depending on cases. During the state, it's better to retry reading the register for current status of the clock.
In current implementation, the intermediate state is checked only when getting current sampling transmission frequency, then retry reading. This care is required for the other operations to read the register.
This commit moves the codes of check and retry into helper function commonly used for operations to read the register.
Fixes: e453df44f0d6 ("ALSA: firewire-tascam: add PCM functionality") Cc: stable@vger.kernel.org # v4.4+ Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/tascam/tascam-stream.c | 42 ++++++++++++++++++--------- 1 file changed, 28 insertions(+), 14 deletions(-)
diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c index 9e2dc2fe3271..adf69a520b80 100644 --- a/sound/firewire/tascam/tascam-stream.c +++ b/sound/firewire/tascam/tascam-stream.c @@ -8,20 +8,37 @@ #include <linux/delay.h> #include "tascam.h"
+#define CLOCK_STATUS_MASK 0xffff0000 +#define CLOCK_CONFIG_MASK 0x0000ffff + #define CALLBACK_TIMEOUT 500
static int get_clock(struct snd_tscm *tscm, u32 *data) { + int trial = 0; __be32 reg; int err;
- err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST, - TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS, - ®, sizeof(reg), 0); - if (err >= 0) + while (trial++ < 5) { + err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST, + TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS, + ®, sizeof(reg), 0); + if (err < 0) + return err; + *data = be32_to_cpu(reg); + if (*data & CLOCK_STATUS_MASK) + break;
- return err; + // In intermediate state after changing clock status. + msleep(50); + } + + // Still in the intermediate state. + if (trial >= 5) + return -EAGAIN; + + return 0; }
static int set_clock(struct snd_tscm *tscm, unsigned int rate, @@ -34,7 +51,7 @@ static int set_clock(struct snd_tscm *tscm, unsigned int rate, err = get_clock(tscm, &data); if (err < 0) return err; - data &= 0x0000ffff; + data &= CLOCK_CONFIG_MASK;
if (rate > 0) { data &= 0x000000ff; @@ -79,17 +96,14 @@ static int set_clock(struct snd_tscm *tscm, unsigned int rate,
int snd_tscm_stream_get_rate(struct snd_tscm *tscm, unsigned int *rate) { - u32 data = 0x0; - unsigned int trials = 0; + u32 data; int err;
- while (data == 0x0 || trials++ < 5) { - err = get_clock(tscm, &data); - if (err < 0) - return err; + err = get_clock(tscm, &data); + if (err < 0) + return err;
- data = (data & 0xff000000) >> 24; - } + data = (data & 0xff000000) >> 24;
/* Check base rate. */ if ((data & 0x0f) == 0x01)