From: Richard Fitzgerald rf@opensource.cirrus.com
stable inclusion from stable-5.10.50 commit a4b7c0af613f54c0ee0adb9a6e803244ab341ebd bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 3d3e88e336338834086278236d42039f3cde50e1 ]
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 Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Link: https://lore.kernel.org/r/20210618144745.30629-1-rf@opensource.cirrus.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.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 a418c3c7001c..304ff2ee7d75 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; } }