}
static int
-sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
+sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
{
struct sdw_msg msg;
int ret;
ret = sdw_fill_msg(&msg, slave, addr, count,
- slave->dev_num, SDW_MSG_FLAG_WRITE, val);
+ slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val);
if (ret < 0)
return ret;
* @slave: SDW Slave
* @addr: Register address
* @count: length
- * @val: Buffer for values to be read
+ * @val: Buffer for values to be written
*/
-int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
+int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
{
int ret;
mutex_unlock(&bus->bus_lock);
}
-static enum sdw_clk_stop_mode sdw_get_clk_stop_mode(struct sdw_slave *slave)
-{
- enum sdw_clk_stop_mode mode;
-
- /*
- * Query for clock stop mode if Slave implements
- * ops->get_clk_stop_mode, else read from property.
- */
- if (slave->ops && slave->ops->get_clk_stop_mode) {
- mode = slave->ops->get_clk_stop_mode(slave);
- } else {
- if (slave->prop.clk_stop_mode1)
- mode = SDW_CLK_STOP_MODE1;
- else
- mode = SDW_CLK_STOP_MODE0;
- }
-
- return mode;
-}
-
static int sdw_slave_clk_stop_callback(struct sdw_slave *slave,
enum sdw_clk_stop_mode mode,
enum sdw_clk_stop_type type)
if (slave->ops && slave->ops->clk_stop) {
ret = slave->ops->clk_stop(slave, mode, type);
- if (ret < 0) {
- dev_err(&slave->dev,
- "Clk Stop type =%d failed: %d\n", type, ret);
+ if (ret < 0)
return ret;
- }
}
return 0;
} else {
ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
if (ret < 0) {
- dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
+ if (ret != -ENODATA)
+ dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
return ret;
}
val = ret;
ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val);
- if (ret < 0)
- dev_err(&slave->dev,
- "Clock Stop prepare failed for slave: %d", ret);
+ if (ret < 0 && ret != -ENODATA)
+ dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL write failed:%d\n", ret);
return ret;
}
do {
val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
if (val < 0) {
- dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
+ if (val != -ENODATA)
+ dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
return val;
}
val &= SDW_SCP_STAT_CLK_STP_NF;
if (!val) {
- dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d",
+ dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d\n",
dev_num);
return 0;
}
retry--;
} while (retry);
- dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d",
+ dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d\n",
dev_num);
return -ETIMEDOUT;
*/
int sdw_bus_prep_clk_stop(struct sdw_bus *bus)
{
- enum sdw_clk_stop_mode slave_mode;
bool simple_clk_stop = true;
struct sdw_slave *slave;
bool is_slave = false;
* In order to save on transition time, prepare
* each Slave and then wait for all Slave(s) to be
* prepared for clock stop.
+ * If one of the Slave devices has lost sync and
+ * replies with Command Ignored/-ENODATA, we continue
+ * the loop
*/
list_for_each_entry(slave, &bus->slaves, node) {
if (!slave->dev_num)
/* Identify if Slave(s) are available on Bus */
is_slave = true;
- slave_mode = sdw_get_clk_stop_mode(slave);
- slave->curr_clk_stop_mode = slave_mode;
-
- ret = sdw_slave_clk_stop_callback(slave, slave_mode,
+ ret = sdw_slave_clk_stop_callback(slave,
+ SDW_CLK_STOP_MODE0,
SDW_CLK_PRE_PREPARE);
- if (ret < 0) {
- dev_err(&slave->dev,
- "pre-prepare failed:%d", ret);
- return ret;
- }
-
- ret = sdw_slave_clk_stop_prepare(slave,
- slave_mode, true);
- if (ret < 0) {
- dev_err(&slave->dev,
- "pre-prepare failed:%d", ret);
+ if (ret < 0 && ret != -ENODATA) {
+ dev_err(&slave->dev, "clock stop pre-prepare cb failed:%d\n", ret);
return ret;
}
- if (slave_mode == SDW_CLK_STOP_MODE1)
+ /* Only prepare a Slave device if needed */
+ if (!slave->prop.simple_clk_stop_capable) {
simple_clk_stop = false;
+
+ ret = sdw_slave_clk_stop_prepare(slave,
+ SDW_CLK_STOP_MODE0,
+ true);
+ if (ret < 0 && ret != -ENODATA) {
+ dev_err(&slave->dev, "clock stop prepare failed:%d\n", ret);
+ return ret;
+ }
+ }
}
/* Skip remaining clock stop preparation if no Slave is attached */
if (!is_slave)
- return ret;
+ return 0;
+ /*
+ * Don't wait for all Slaves to be ready if they follow the simple
+ * state machine
+ */
if (!simple_clk_stop) {
ret = sdw_bus_wait_for_clk_prep_deprep(bus,
SDW_BROADCAST_DEV_NUM);
+ /*
+ * if there are no Slave devices present and the reply is
+ * Command_Ignored/-ENODATA, we don't need to continue with the
+ * flow and can just return here. The error code is not modified
+ * and its handling left as an exercise for the caller.
+ */
if (ret < 0)
return ret;
}
slave->status != SDW_SLAVE_ALERT)
continue;
- slave_mode = slave->curr_clk_stop_mode;
-
- if (slave_mode == SDW_CLK_STOP_MODE1) {
- ret = sdw_slave_clk_stop_callback(slave,
- slave_mode,
- SDW_CLK_POST_PREPARE);
+ ret = sdw_slave_clk_stop_callback(slave,
+ SDW_CLK_STOP_MODE0,
+ SDW_CLK_POST_PREPARE);
- if (ret < 0) {
- dev_err(&slave->dev,
- "post-prepare failed:%d", ret);
- }
+ if (ret < 0 && ret != -ENODATA) {
+ dev_err(&slave->dev, "clock stop post-prepare cb failed:%d\n", ret);
+ return ret;
}
}
- return ret;
+ return 0;
}
EXPORT_SYMBOL(sdw_bus_prep_clk_stop);
ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
if (ret < 0) {
- if (ret == -ENODATA)
- dev_dbg(bus->dev,
- "ClockStopNow Broadcast msg ignored %d", ret);
- else
- dev_err(bus->dev,
- "ClockStopNow Broadcast msg failed %d", ret);
+ if (ret != -ENODATA)
+ dev_err(bus->dev, "ClockStopNow Broadcast msg failed %d\n", ret);
return ret;
}
*/
int sdw_bus_exit_clk_stop(struct sdw_bus *bus)
{
- enum sdw_clk_stop_mode mode;
bool simple_clk_stop = true;
struct sdw_slave *slave;
bool is_slave = false;
/* Identify if Slave(s) are available on Bus */
is_slave = true;
- mode = slave->curr_clk_stop_mode;
-
- if (mode == SDW_CLK_STOP_MODE1) {
- simple_clk_stop = false;
- continue;
- }
-
- ret = sdw_slave_clk_stop_callback(slave, mode,
+ ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
SDW_CLK_PRE_DEPREPARE);
if (ret < 0)
- dev_warn(&slave->dev,
- "clk stop deprep failed:%d", ret);
+ dev_warn(&slave->dev, "clock stop pre-deprepare cb failed:%d\n", ret);
- ret = sdw_slave_clk_stop_prepare(slave, mode,
- false);
+ /* Only de-prepare a Slave device if needed */
+ if (!slave->prop.simple_clk_stop_capable) {
+ simple_clk_stop = false;
- if (ret < 0)
- dev_warn(&slave->dev,
- "clk stop deprep failed:%d", ret);
+ ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0,
+ false);
+
+ if (ret < 0)
+ dev_warn(&slave->dev, "clock stop deprepare failed:%d\n", ret);
+ }
}
/* 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 wait for all Slaves to be ready if they follow the simple
+ * state machine
+ */
+ if (!simple_clk_stop) {
+ ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);
+ if (ret < 0)
+ dev_warn(&slave->dev, "clock stop deprepare wait failed:%d\n", ret);
+ }
list_for_each_entry(slave, &bus->slaves, node) {
if (!slave->dev_num)
slave->status != SDW_SLAVE_ALERT)
continue;
- mode = slave->curr_clk_stop_mode;
- sdw_slave_clk_stop_callback(slave, mode,
- SDW_CLK_POST_DEPREPARE);
+ ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
+ SDW_CLK_POST_DEPREPARE);
+ if (ret < 0)
+ dev_warn(&slave->dev, "clock stop post-deprepare cb failed:%d\n", ret);
}
return 0;
projects / linux-2.6-microblaze.git / blobdiff