From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: alsa-devel@alsa-project.org
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
tiwai@suse.de, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org,
Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
vkoul@kernel.org, broonie@kernel.org,
srinivas.kandagatla@linaro.org, jank@cadence.com,
slawomir.blauciak@intel.com,
Sanyog Kale <sanyog.r.kale@intel.com>,
Bard liao <yung-chuan.liao@linux.intel.com>,
Rander Wang <rander.wang@linux.intel.com>
Subject: [alsa-devel] [PATCH v2 03/19] soundwire: bus: add PM/no-PM versions of read/write functions
Date: Wed, 6 Nov 2019 13:22:07 -0600 [thread overview]
Message-ID: <20191106192223.6003-4-pierre-louis.bossart@linux.intel.com> (raw)
In-Reply-To: <20191106192223.6003-1-pierre-louis.bossart@linux.intel.com>
Add support for pm_runtime with the appropriate error checks for
sdw_write/read functions, e.g. when pm_runtime is not supported.
Also expose internal functions without pm_runtime support, which are
required to perform any sort of suspend/resume operation, as well as
any enumeration tasks.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/bus.c | 68 +++++++++++++++++++++++++++++++----------
1 file changed, 52 insertions(+), 16 deletions(-)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 903aee258800..7f431677f152 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -317,6 +317,46 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
return 0;
}
+/*
+ * Read/Write IO functions.
+ * no_pm versions can only be called by the bus, e.g. while enumerating or
+ * handling suspend-resume sequences.
+ * all clients need to use the pm versions
+ */
+
+static int
+sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
+{
+ struct sdw_msg msg;
+ int ret;
+
+ ret = sdw_fill_msg(&msg, slave, addr, count,
+ slave->dev_num, SDW_MSG_FLAG_READ, val);
+ if (ret < 0)
+ return ret;
+
+ return sdw_transfer(slave->bus, &msg);
+}
+
+static int
+sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
+{
+ struct sdw_msg msg;
+ int ret;
+
+ ret = sdw_fill_msg(&msg, slave, addr, count,
+ slave->dev_num, SDW_MSG_FLAG_WRITE, val);
+ if (ret < 0)
+ return ret;
+
+ return sdw_transfer(slave->bus, &msg);
+}
+
+int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
+{
+ return sdw_nwrite_no_pm(slave, addr, 1, &value);
+}
+
/**
* sdw_nread() - Read "n" contiguous SDW Slave registers
* @slave: SDW Slave
@@ -326,19 +366,17 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
*/
int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
{
- struct sdw_msg msg;
int ret;
- ret = sdw_fill_msg(&msg, slave, addr, count,
- slave->dev_num, SDW_MSG_FLAG_READ, val);
- if (ret < 0)
- return ret;
-
ret = pm_runtime_get_sync(slave->bus->dev);
- if (ret < 0)
+ if (ret < 0 && ret != -EACCES) {
+ pm_runtime_put_noidle(slave->bus->dev);
return ret;
+ }
+
+ ret = sdw_nread_no_pm(slave, addr, count, val);
- ret = sdw_transfer(slave->bus, &msg);
+ pm_runtime_mark_last_busy(slave->bus->dev);
pm_runtime_put(slave->bus->dev);
return ret;
@@ -354,19 +392,17 @@ EXPORT_SYMBOL(sdw_nread);
*/
int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
{
- struct sdw_msg msg;
int ret;
- ret = sdw_fill_msg(&msg, slave, addr, count,
- slave->dev_num, SDW_MSG_FLAG_WRITE, val);
- if (ret < 0)
- return ret;
-
ret = pm_runtime_get_sync(slave->bus->dev);
- if (ret < 0)
+ if (ret < 0 && ret != -EACCES) {
+ pm_runtime_put_noidle(slave->bus->dev);
return ret;
+ }
+
+ ret = sdw_nwrite_no_pm(slave, addr, count, val);
- ret = sdw_transfer(slave->bus, &msg);
+ pm_runtime_mark_last_busy(slave->bus->dev);
pm_runtime_put(slave->bus->dev);
return ret;
--
2.20.1
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next prev parent reply other threads:[~2019-11-06 19:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-06 19:22 [alsa-devel] [PATCH v2 00/19] soundwire: code hardening and suspend-resume support Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 01/19] soundwire: intel/cadence: fix timeouts in MSI mode Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 02/19] soundwire: fix race between driver probe and update_status callback Pierre-Louis Bossart
2019-11-06 19:22 ` Pierre-Louis Bossart [this message]
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 04/19] soundwire: bus: write Slave Device Number without runtime_pm Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 05/19] soundwire: intel: add helpers for link power down and shim wake Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 06/19] soundwire: intel: Add basic power management support Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 07/19] soundwire: intel: add pm_runtime support Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 08/19] soundwire: intel: reset pm_runtime status during system resume Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 09/19] soundwire: bus: add helper to reset Slave status to UNATTACHED Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 10/19] soundwire: intel: call helper to reset Slave states on resume Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 11/19] soundwire: bus: check first if Slaves become UNATTACHED Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 12/19] soundwire: add enumeration_complete signaling Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 13/19] soundwire: bus: add initialization_complete signaling Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 14/19] soundwire: intel: disable pm_runtime when removing a master Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 15/19] soundwire: bus: disable pm_runtime in sdw_slave_delete Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 16/19] soundwire: stream: update state machine and add state checks Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 17/19] soundwire: stream: only prepare stream when it is configured Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 18/19] soundwire: stream: do not update parameters during DISABLED-PREPARED transition Pierre-Louis Bossart
2019-11-06 19:22 ` [alsa-devel] [PATCH v2 19/19] soundwire: intel: reinitialize IP+DSP in .prepare() Pierre-Louis Bossart
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