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soundwire: intel_ace2x: handle the max_data_per_frame property

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The optional property indicates the maximum data payload size for the
BRA mode.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20260728124639.1484973-6-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Bard Liao 2026-07-28 20:46:39 +08:00 committed by Vinod Koul
parent 5ccdf9ba59
commit 2a4127a4c5
2 changed files with 24 additions and 2 deletions
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18
drivers/soundwire/intel_ace2x.c
View File

@ -57,6 +57,7 @@ static int intel_ace2x_bpt_open_stream(struct sdw_intel *sdw, struct sdw_slave *
struct sdw_port_config *pconfig;
unsigned int pdi0_buf_size_pre_frame;
unsigned int pdi1_buf_size_pre_frame;
unsigned int max_data_per_frame;
unsigned int pdi0_buffer_size_;
unsigned int pdi1_buffer_size_;
unsigned int pdi0_buffer_size;
@ -168,11 +169,24 @@ static int intel_ace2x_bpt_open_stream(struct sdw_intel *sdw, struct sdw_slave *
pdi0_buffer_size = 0;
pdi1_buffer_size = 0;
num_frames = 0;
if (slave->prop.bra_max_data_per_frame) {
max_data_per_frame = slave->prop.bra_max_data_per_frame;
if (max_data_per_frame > SDW_BRA_MAX_BYTES_PER_FRAME) {
dev_warn(&slave->dev,
"BRA max_data_per_frame %u exceeds limit %u, clamping\n",
max_data_per_frame, SDW_BRA_MAX_BYTES_PER_FRAME);
max_data_per_frame = SDW_BRA_MAX_BYTES_PER_FRAME;
}
} else {
max_data_per_frame = SDW_BRA_MAX_BYTES_PER_FRAME;
}
/* Add up pdi buffer size and frame numbers of each BPT sections */
for (i = 0; i < msg->sections; i++) {
ret = sdw_cdns_bpt_find_buffer_sizes(command, cdns->bus.params.row,
cdns->bus.params.col,
msg->sec[i].len, SDW_BPT_MSG_MAX_BYTES,
msg->sec[i].len, max_data_per_frame,
slave->prop.bra_block_alignment,
&data_per_frame, &pdi0_buffer_size_,
&pdi1_buffer_size_, &num_frames_);
@ -197,7 +211,7 @@ static int intel_ace2x_bpt_open_stream(struct sdw_intel *sdw, struct sdw_slave *
/* Get buffer size of a full frame */
ret = sdw_cdns_bpt_find_buffer_sizes(command, cdns->bus.params.row,
cdns->bus.params.col,
data_per_frame, SDW_BPT_MSG_MAX_BYTES,
data_per_frame, max_data_per_frame,
slave->prop.bra_block_alignment,
&data_per_frame, &pdi0_buf_size_pre_frame,
&pdi1_buf_size_pre_frame, &fake_num_frames);

8
include/linux/soundwire/sdw.h
View File

@ -843,6 +843,14 @@ struct sdw_defer {
*/
#define SDW_BPT_MSG_MAX_BYTES (1024 * 1024)
/*
* According to mipi SoundWire DisCo Specification_v2-1,
* this maximum value shall not exceed 470.
* Note that the largest number of bytes accessible by a single BRA operation is limited to 470
* bytes when using lane 0, but goes up to 502 bytes when using one of the optional extra lanes.
*/
#define SDW_BRA_MAX_BYTES_PER_FRAME 470
struct sdw_bpt_msg;
/**