From: Bard Liao <yung-chuan.liao@linux.intel.com> To: alsa-devel@alsa-project.org, vkoul@kernel.org Cc: vinod.koul@linaro.org, linux-kernel@vger.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: [PATCH] soundwire: return earlier if no slave is attached Date: Tue, 26 Jan 2021 16:54:39 +0800 [thread overview] Message-ID: <20210126085439.4349-1-yung-chuan.liao@linux.intel.com> (raw) From: Chao Song <chao.song@linux.intel.com> If there is no slave attached to soundwire bus, we can return earlier from sdw_bus_prep_clk_stop() and sdw_bus_exit_clk_stop(), this saves a redundant value check. Signed-off-by: Chao Song <chao.song@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> --- drivers/soundwire/bus.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 82df088c9333..d9deafdcf495 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -951,17 +951,17 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) simple_clk_stop = false; } - if (is_slave && !simple_clk_stop) { + /* Skip remaining clock stop preparation if no Slave is attached */ + if (!is_slave) + return ret; + + if (!simple_clk_stop) { ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); if (ret < 0) return ret; } - /* Don't need to inform slaves if there is no slave attached */ - if (!is_slave) - return ret; - /* Inform slaves that prep is done */ list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) @@ -1075,16 +1075,13 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) "clk stop deprep failed:%d", ret); } - if (is_slave && !simple_clk_stop) + /* Skip remaining clock stop de-preparation if no Slave is attached */ + if (!is_slave) + return 0; + + if (!simple_clk_stop) sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); - /* - * Don't need to call slave callback function if there is no slave - * attached - */ - if (!is_slave) - return 0; - list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) continue; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Bard Liao <yung-chuan.liao@linux.intel.com> To: alsa-devel@alsa-project.org, vkoul@kernel.org Cc: pierre-louis.bossart@linux.intel.com, vinod.koul@linaro.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, srinivas.kandagatla@linaro.org, jank@cadence.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com Subject: [PATCH] soundwire: return earlier if no slave is attached Date: Tue, 26 Jan 2021 16:54:39 +0800 [thread overview] Message-ID: <20210126085439.4349-1-yung-chuan.liao@linux.intel.com> (raw) From: Chao Song <chao.song@linux.intel.com> If there is no slave attached to soundwire bus, we can return earlier from sdw_bus_prep_clk_stop() and sdw_bus_exit_clk_stop(), this saves a redundant value check. Signed-off-by: Chao Song <chao.song@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> --- drivers/soundwire/bus.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 82df088c9333..d9deafdcf495 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -951,17 +951,17 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) simple_clk_stop = false; } - if (is_slave && !simple_clk_stop) { + /* Skip remaining clock stop preparation if no Slave is attached */ + if (!is_slave) + return ret; + + if (!simple_clk_stop) { ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); if (ret < 0) return ret; } - /* Don't need to inform slaves if there is no slave attached */ - if (!is_slave) - return ret; - /* Inform slaves that prep is done */ list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) @@ -1075,16 +1075,13 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) "clk stop deprep failed:%d", ret); } - if (is_slave && !simple_clk_stop) + /* Skip remaining clock stop de-preparation if no Slave is attached */ + if (!is_slave) + return 0; + + if (!simple_clk_stop) sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); - /* - * Don't need to call slave callback function if there is no slave - * attached - */ - if (!is_slave) - return 0; - list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) continue; -- 2.17.1
next reply other threads:[~2021-01-26 18:23 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-26 8:54 Bard Liao [this message] 2021-01-26 8:54 ` [PATCH] soundwire: return earlier if no slave is attached Bard Liao 2021-02-01 10:41 ` Vinod Koul 2021-02-01 10:41 ` Vinod Koul
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