From: Vinod Koul <vkoul@kernel.org> To: Bard Liao <yung-chuan.liao@linux.intel.com> Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com, srinivas.kandagatla@linaro.org, rander.wang@linux.intel.com, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, bard.liao@intel.com Subject: Re: [PATCH 1/7] soundwire: bus: use sdw_update_no_pm when initializing a device Date: Sat, 5 Dec 2020 13:15:08 +0530 [thread overview] Message-ID: <20201205074508.GQ8403@vkoul-mobl> (raw) In-Reply-To: <20201202204645.23891-2-yung-chuan.liao@linux.intel.com> On 03-12-20, 04:46, Bard Liao wrote: > From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > > When a Slave device is resumed, it may resume the bus and restart the > enumeration. During that process, we absolutely don't want to call > regular read/write routines which will wait for the resume to > complete, otherwise a deadlock occurs. > > Fixes: 60ee9be25571 ('soundwire: bus: add PM/no-PM versions of read/write functions') Change looks okay, but not sure why this is a fix for adding no pm version? > Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > Reviewed-by: Rander Wang <rander.wang@linux.intel.com> > Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> > --- > drivers/soundwire/bus.c | 16 ++++++++++++++-- > 1 file changed, 14 insertions(+), 2 deletions(-) > > diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c > index d1e8c3a54976..60c42508c6c6 100644 > --- a/drivers/soundwire/bus.c > +++ b/drivers/soundwire/bus.c > @@ -489,6 +489,18 @@ sdw_read_no_pm(struct sdw_slave *slave, u32 addr) > return buf; > } > > +static int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) > +{ > + int tmp; > + > + tmp = sdw_read_no_pm(slave, addr); > + if (tmp < 0) > + return tmp; > + > + tmp = (tmp & ~mask) | val; > + return sdw_write_no_pm(slave, addr, tmp); > +} > + > /** > * sdw_nread() - Read "n" contiguous SDW Slave registers > * @slave: SDW Slave > @@ -1256,7 +1268,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave) > val = slave->prop.scp_int1_mask; > > /* Enable SCP interrupts */ > - ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val); > + ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val); > if (ret < 0) { > dev_err(slave->bus->dev, > "SDW_SCP_INTMASK1 write failed:%d\n", ret); > @@ -1271,7 +1283,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave) > val = prop->dp0_prop->imp_def_interrupts; > val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE; > > - ret = sdw_update(slave, SDW_DP0_INTMASK, val, val); > + ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val); > if (ret < 0) > dev_err(slave->bus->dev, > "SDW_DP0_INTMASK read failed:%d\n", ret); > -- > 2.17.1 -- ~Vinod
WARNING: multiple messages have this Message-ID (diff)
From: Vinod Koul <vkoul@kernel.org> To: Bard Liao <yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, alsa-devel@alsa-project.org, tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com Subject: Re: [PATCH 1/7] soundwire: bus: use sdw_update_no_pm when initializing a device Date: Sat, 5 Dec 2020 13:15:08 +0530 [thread overview] Message-ID: <20201205074508.GQ8403@vkoul-mobl> (raw) In-Reply-To: <20201202204645.23891-2-yung-chuan.liao@linux.intel.com> On 03-12-20, 04:46, Bard Liao wrote: > From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > > When a Slave device is resumed, it may resume the bus and restart the > enumeration. During that process, we absolutely don't want to call > regular read/write routines which will wait for the resume to > complete, otherwise a deadlock occurs. > > Fixes: 60ee9be25571 ('soundwire: bus: add PM/no-PM versions of read/write functions') Change looks okay, but not sure why this is a fix for adding no pm version? > Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > Reviewed-by: Rander Wang <rander.wang@linux.intel.com> > Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> > --- > drivers/soundwire/bus.c | 16 ++++++++++++++-- > 1 file changed, 14 insertions(+), 2 deletions(-) > > diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c > index d1e8c3a54976..60c42508c6c6 100644 > --- a/drivers/soundwire/bus.c > +++ b/drivers/soundwire/bus.c > @@ -489,6 +489,18 @@ sdw_read_no_pm(struct sdw_slave *slave, u32 addr) > return buf; > } > > +static int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) > +{ > + int tmp; > + > + tmp = sdw_read_no_pm(slave, addr); > + if (tmp < 0) > + return tmp; > + > + tmp = (tmp & ~mask) | val; > + return sdw_write_no_pm(slave, addr, tmp); > +} > + > /** > * sdw_nread() - Read "n" contiguous SDW Slave registers > * @slave: SDW Slave > @@ -1256,7 +1268,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave) > val = slave->prop.scp_int1_mask; > > /* Enable SCP interrupts */ > - ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val); > + ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val); > if (ret < 0) { > dev_err(slave->bus->dev, > "SDW_SCP_INTMASK1 write failed:%d\n", ret); > @@ -1271,7 +1283,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave) > val = prop->dp0_prop->imp_def_interrupts; > val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE; > > - ret = sdw_update(slave, SDW_DP0_INTMASK, val, val); > + ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val); > if (ret < 0) > dev_err(slave->bus->dev, > "SDW_DP0_INTMASK read failed:%d\n", ret); > -- > 2.17.1 -- ~Vinod
next prev parent reply other threads:[~2020-12-05 7:45 UTC|newest] Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-02 20:46 [PATCH 0/7] soundwire/regmap: use _no_pm routines Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-02 20:46 ` [PATCH 1/7] soundwire: bus: use sdw_update_no_pm when initializing a device Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-05 7:45 ` Vinod Koul [this message] 2020-12-05 7:45 ` Vinod Koul 2020-12-05 14:59 ` Pierre-Louis Bossart 2020-12-07 4:43 ` Vinod Koul 2020-12-07 4:43 ` Vinod Koul 2020-12-07 15:31 ` Pierre-Louis Bossart 2020-12-07 15:31 ` Pierre-Louis Bossart 2020-12-08 4:56 ` Vinod Koul 2020-12-08 4:56 ` Vinod Koul 2020-12-02 20:46 ` [PATCH 2/7] soundwire: bus: use sdw_write_no_pm when setting the bus scale registers Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-02 20:46 ` [PATCH 3/7] soundwire: bus: use no_pm IO routines for all interrupt handling Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-02 20:46 ` [PATCH 4/7] soundwire/regmap: use _no_pm functions in regmap_read/write Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-05 7:45 ` Vinod Koul 2020-12-05 7:45 ` Vinod Koul 2020-12-05 14:43 ` Pierre-Louis Bossart 2020-12-02 20:46 ` [PATCH 5/7] regmap: sdw: use no_pm routines for SoundWire 1.2 MBQ Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-05 7:46 ` Vinod Koul 2020-12-05 7:46 ` Vinod Koul 2020-12-05 14:52 ` Pierre-Louis Bossart 2020-12-05 16:31 ` Greg KH 2020-12-05 16:31 ` Greg KH 2020-12-07 4:47 ` Vinod Koul 2020-12-07 4:47 ` Vinod Koul 2020-12-02 20:46 ` [PATCH 6/7] soundwire: bus: fix confusion on device used by pm_runtime Bard Liao 2020-12-02 20:46 ` Bard Liao 2020-12-02 20:46 ` [PATCH 7/7] soundwire: bus: clarify dev_err/dbg device references Bard Liao 2020-12-02 20:46 ` Bard Liao
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