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soundwire: debugfs: add interface for BPT/BRA transfers

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Add code to show what codec drivers will need to do to enable BPT/BRA
transfers. The only difference is to set the 'command_type' file to
'1'. A zero-value will rely on regular read/write commands in Column0.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Tested-by: shumingf@realtek.com
Link: https://lore.kernel.org/r/20250227140615.8147-16-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2025-02-27 22:06:14 +08:00 • committed by Vinod Koul
parent 3394e2b125
commit bb5cb09eed
1 changed files with 70 additions and 18 deletions
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88
drivers/soundwire/debugfs.c
View file

@ -136,9 +136,10 @@ static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
}
DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
#define MAX_CMD_BYTES 256
#define MAX_CMD_BYTES (1024 * 1024)
static int cmd;
static int cmd_type;
static u32 start_addr;
static size_t num_bytes;
static u8 read_buffer[MAX_CMD_BYTES];
@ -162,6 +163,25 @@ static int set_command(void *data, u64 value)
DEFINE_DEBUGFS_ATTRIBUTE(set_command_fops, NULL,
set_command, "%llu\n");
static int set_command_type(void *data, u64 value)
{
struct sdw_slave *slave = data;
if (value > 1)
return -EINVAL;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "command type: %s\n", value ? "BRA" : "Column0");
cmd_type = (int)value;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(set_command_type_fops, NULL,
set_command_type, "%llu\n");
static int set_start_address(void *data, u64 value)
{
struct sdw_slave *slave = data;
@ -197,9 +217,28 @@ static int set_num_bytes(void *data, u64 value)
DEFINE_DEBUGFS_ATTRIBUTE(set_num_bytes_fops, NULL,
set_num_bytes, "%llu\n");
static int do_bpt_sequence(struct sdw_slave *slave, bool write, u8 *buffer)
{
struct sdw_bpt_msg msg = {0};
msg.addr = start_addr;
msg.len = num_bytes;
msg.dev_num = slave->dev_num;
if (write)
msg.flags = SDW_MSG_FLAG_WRITE;
else
msg.flags = SDW_MSG_FLAG_READ;
msg.buf = buffer;
return sdw_bpt_send_sync(slave->bus, slave, &msg);
}
static int cmd_go(void *data, u64 value)
{
const struct firmware *fw = NULL;
struct sdw_slave *slave = data;
ktime_t start_t;
ktime_t finish_t;
int ret;
if (value != 1)
@ -216,40 +255,52 @@ static int cmd_go(void *data, u64 value)
return ret;
}
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "starting command\n");
if (cmd == 0) {
const struct firmware *fw;
ret = request_firmware(&fw, firmware_file, &slave->dev);
if (ret < 0) {
dev_err(&slave->dev, "firmware %s not found\n", firmware_file);
goto out;
}
if (fw->size != num_bytes) {
if (fw->size < num_bytes) {
dev_err(&slave->dev,
"firmware %s: unexpected size %zd, desired %zd\n",
"firmware %s: firmware size %zd, desired %zd\n",
firmware_file, fw->size, num_bytes);
release_firmware(fw);
goto out;
}
ret = sdw_nwrite_no_pm(slave, start_addr, num_bytes, fw->data);
release_firmware(fw);
} else {
ret = sdw_nread_no_pm(slave, start_addr, num_bytes, read_buffer);
}
dev_dbg(&slave->dev, "command completed %d\n", ret);
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "starting command\n");
start_t = ktime_get();
if (cmd == 0) {
if (cmd_type)
ret = do_bpt_sequence(slave, true, (u8 *)fw->data);
else
ret = sdw_nwrite_no_pm(slave, start_addr, num_bytes, fw->data);
} else {
memset(read_buffer, 0, sizeof(read_buffer));
if (cmd_type)
ret = do_bpt_sequence(slave, false, read_buffer);
else
ret = sdw_nread_no_pm(slave, start_addr, num_bytes, read_buffer);
}
finish_t = ktime_get();
out:
if (fw)
release_firmware(fw);
pm_runtime_mark_last_busy(&slave->dev);
pm_runtime_put(&slave->dev);
dev_dbg(&slave->dev, "command completed, num_byte %zu status %d, time %lld ms\n",
num_bytes, ret, div_u64(finish_t - start_t, NSEC_PER_MSEC));
return ret;
}
DEFINE_DEBUGFS_ATTRIBUTE(cmd_go_fops, NULL,
@ -291,6 +342,7 @@ void sdw_slave_debugfs_init(struct sdw_slave *slave)
/* interface to send arbitrary commands */
debugfs_create_file("command", 0200, d, slave, &set_command_fops);
debugfs_create_file("command_type", 0200, d, slave, &set_command_type_fops);
debugfs_create_file("start_address", 0200, d, slave, &set_start_address_fops);
debugfs_create_file("num_bytes", 0200, d, slave, &set_num_bytes_fops);
debugfs_create_file("go", 0200, d, slave, &cmd_go_fops);