On 6/18/21 9:47 AM, Richard Fitzgerald wrote:

In sdw_prep_deprep_slave_ports(), after the wait_for_completion() the DP prepare status register is read. If this indicates that the port is now prepared, the code should continue with the port setup. It is irrelevant whether the wait_for_completion() timed out if the port is now ready.

The previous implementation would always fail if the wait_for_completion() timed out, even if the port was reporting successful prepare.

This patch also fixes a minor bug where the return from sdw_read() was not checked for error - any error code with LSBits clear could be misinterpreted as a successful port prepare.

Fixes: 79df15b7d37c ("soundwire: Add helpers for ports operations") Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com

Looks good to me

Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com

---

drivers/soundwire/stream.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c index 1eaedaaba094..1a18308f4ef4 100644 --- a/drivers/soundwire/stream.c +++ b/drivers/soundwire/stream.c @@ -422,7 +422,6 @@ static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus, struct completion *port_ready; struct sdw_dpn_prop *dpn_prop; struct sdw_prepare_ch prep_ch;

• unsigned int time_left; bool intr = false; int ret = 0, val; u32 addr;

@@ -479,15 +478,15 @@ static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,

/* Wait for completion on port ready */
port_ready = &s_rt->slave->port_ready[prep_ch.num];

• time_left = wait_for_completion_timeout(port_ready,
  

• 		msecs_to_jiffies(dpn_prop->ch_prep_timeout));
  

• wait_for_completion_timeout(port_ready,
  

• 	msecs_to_jiffies(dpn_prop->ch_prep_timeout));
  
  

  val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));

• val &= p_rt->ch_mask;
  

• if (!time_left || val) {
  

• if ((val < 0) || (val & p_rt->ch_mask)) {
  

• 	ret = (val < 0) ? val : -ETIMEDOUT;
  dev_err(&s_rt->slave->dev,
  

• 		"Chn prep failed for port:%d\n", prep_ch.num);
  

• 	return -ETIMEDOUT;
  

• 		"Chn prep failed for port %d: %d\n", prep_ch.num, ret);
  

• 	return ret;
  

  } }