michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: i3c: cdns: fix transfers while not idle

Browse source 
If a transfer happen in rapid sucession. It was possible for
the core to not be ready to accept another command. Poll on
the idle status bit until the core is ready to accept new data.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>
This commit is contained in:
Ryan McClelland 2023-08-04 14:58:03 -07:00 • committed by Carles Cufí
commit 1b63e49b3f
1 changed files with 59 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

67
drivers/i3c/i3c_cdns.c
View file

@ -371,12 +371,13 @@
#define I3C_CONTROLLER_ADDR 0x08
/* Maximum i3c devices that the IP can be built with */
#define I3C_MAX_DEVS 11
#define I3C_MAX_MSGS 10
#define I3C_SIR_DEFAULT_DA 0x7F
#define I3C_MAX_IDLE_WAIT_RETRIES 50
#define I3C_PRESCL_REG_SCALE (4)
#define I2C_PRESCL_REG_SCALE (5)
#define I3C_MAX_DEVS 11
#define I3C_MAX_MSGS 10
#define I3C_SIR_DEFAULT_DA 0x7F
#define I3C_MAX_IDLE_CANCEL_WAIT_RETRIES 50
#define I3C_MAX_IDLE_WAIT_RETRIES 5000
#define I3C_PRESCL_REG_SCALE (4)
#define I2C_PRESCL_REG_SCALE (5)
/* Target T_LOW period in open-drain mode. */
#define I3C_BUS_TLOW_OD_MIN_NS 200
@ -888,7 +889,7 @@ static void cdns_i3c_cancel_transfer(const struct device *dev)
* actually take any time since we only get here if a transaction didn't
* complete in a long time.
*/
retry_count = I3C_MAX_IDLE_WAIT_RETRIES;
retry_count = I3C_MAX_IDLE_CANCEL_WAIT_RETRIES;
while (retry_count--) {
val = sys_read32(config->base + MST_STATUS0);
if (val & MST_STATUS0_IDLE) {
@ -1017,6 +1018,22 @@ static int cdns_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
k_mutex_lock(&data->bus_lock, K_FOREVER);
/**
* Spin waiting for device to go idle. It is unlikely that this will
* actually take any time unless if the last transaction came immediately
* after an error condition.
*/
uint32_t retry_count = I3C_MAX_IDLE_WAIT_RETRIES;
while (!(sys_read32(config->base + MST_STATUS0) & MST_STATUS0_IDLE) && (retry_count > 0)) {
retry_count--;
}
if (retry_count == 0) {
LOG_ERR("%s: Unable to start transfer, device not idle", dev->name);
ret = -EAGAIN;
goto error;
}
dcmd->cmd1 = CMD1_FIFO_CCC(payload->ccc.id);
dcmd->cmd0 = CMD0_FIFO_IS_CCC;
dcmd->len = 0;
@ -1070,7 +1087,6 @@ static int cdns_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
data->xfer.num_cmds = num_cmds;
cdns_i3c_start_transfer(dev);
if (k_sem_take(&data->xfer.complete, K_MSEC(1000)) != 0) {
cdns_i3c_cancel_transfer(dev);
}
@ -1080,6 +1096,7 @@ static int cdns_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
}
ret = data->xfer.ret;
error:
k_mutex_unlock(&data->bus_lock);
return ret;
@ -1389,6 +1406,22 @@ static int cdns_i3c_i2c_transfer(const struct device *dev, struct i3c_i2c_device
k_mutex_lock(&data->bus_lock, K_FOREVER);
/**
* Spin waiting for device to go idle. It is unlikely that this will
* actually take any time unless if the last transaction came immediately
* after an error condition.
*/
uint32_t retry_count = I3C_MAX_IDLE_WAIT_RETRIES;
while (!(sys_read32(config->base + MST_STATUS0) & MST_STATUS0_IDLE) && (retry_count > 0)) {
retry_count--;
}
if (retry_count == 0) {
LOG_ERR("%s: Unable to start transfer, device not idle", dev->name);
ret = -EAGAIN;
goto error;
}
for (unsigned int i = 0; i < num_msgs; i++) {
struct cdns_i3c_cmd *cmd = &data->xfer.cmds[i];
@ -1422,6 +1455,7 @@ static int cdns_i3c_i2c_transfer(const struct device *dev, struct i3c_i2c_device
}
ret = data->xfer.ret;
error:
k_mutex_unlock(&data->bus_lock);
return ret;
@ -1664,6 +1698,22 @@ static int cdns_i3c_transfer(const struct device *dev, struct i3c_device_desc *t
k_mutex_lock(&data->bus_lock, K_FOREVER);
/**
* Spin waiting for device to go idle. It is unlikely that this will
* actually take any time unless if the last transaction came immediately
* after an error condition.
*/
uint32_t retry_count = I3C_MAX_IDLE_WAIT_RETRIES;
while (!(sys_read32(config->base + MST_STATUS0) & MST_STATUS0_IDLE) && (retry_count > 0)) {
retry_count--;
}
if (retry_count == 0) {
LOG_ERR("%s: Unable to start transfer, device not idle", dev->name);
ret = -EAGAIN;
goto error;
}
/*
* Prepare transfer commands. Currently there is only a single transfer
* in-flight but it would be possible to keep a queue of transfers. If so,
@ -1716,6 +1766,7 @@ static int cdns_i3c_transfer(const struct device *dev, struct i3c_device_desc *t
}
ret = data->xfer.ret;
error:
k_mutex_unlock(&data->bus_lock);
return ret;