soundwire: cadence: add self-test from SoundWire spec

Use the example in the spec to test if all the bits are in the right places. Signed-off-by: Pierre-Louis Bossart <[email protected]>
thesofproject · Nov 29, 2023 · 80f465e · 80f465e
1 parent 49f94be
commit 80f465e
Show file tree

Hide file tree

Showing 2 changed files with 96 additions and 0 deletions.
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
@@ -1352,6 +1352,16 @@ int sdw_cdns_init(struct sdw_cdns *cdns)
 {
  u32 val;
 
+ {
+ int ret;
+
+ dev_info(cdns->dev, "starting bra test\n");
+ ret = sdw_cdns_test_bra_data_block();
+ if (ret < 0)
+ return ret;
+ dev_info(cdns->dev, "done bra test\n");
+ }
+
  cdns_init_clock_ctrl(cdns);
 
  sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
@@ -2307,5 +2317,89 @@ int sdw_cdns_prepare_read_dma_buffer(u8 dev_num, u32 start_register,
 }
 EXPORT_SYMBOL(sdw_cdns_prepare_read_dma_buffer);
 
+int sdw_cdns_test_bra_data_block(void)
+{
+ u8 dev_num = 2;
+ u8 data[7];
+ int data_size = ARRAY_SIZE(data);
+ int requested_bytes_per_frame = 3;
+ int data_per_frame;
+ u8 dma_buffer[256];
+ int dma_buffer_size;
+ unsigned int pdi0_buffer_size;
+ unsigned int pdi1_buffer_size;
+ unsigned int num_frames;
+
+ u32 start_register = 0x12345678;
+ int total_dma_data_written;
+ int ret;
+ int row = 50;
+ int col = 4;
+
+ /* first frame */
+ data[0] = 0xED;
+ data[1] = 0xD1;
+ data[2] = 0xEA;
+
+ /* second frame */
+ data[3] = 0xED;
+ data[4] = 0xD1;
+ data[5] = 0xEA;
+
+ /* third partial frame */
+ data[6] = 0xDD;
+
+ ret = sdw_cdns_bpt_find_buffer_sizes(0,
+ row, col,
+ data_size,
+ requested_bytes_per_frame,
+ &data_per_frame,
+ &pdi0_buffer_size,
+ &pdi1_buffer_size,
+ &num_frames);
+ if (ret < 0)
+ return ret;
+
+ dma_buffer_size = pdi0_buffer_size;
+
+ ret = sdw_cdns_prepare_write_dma_buffer(dev_num, start_register,
+ data, data_size,
+ data_per_frame,
+ dma_buffer, dma_buffer_size,
+ &total_dma_data_written);
+ if (ret < 0)
+ return ret;
+
+ print_hex_dump_debug("DMA data: ", DUMP_PREFIX_OFFSET,
+ 4, 4, dma_buffer, total_dma_data_written, false);
+
+ ret = sdw_cdns_bpt_find_buffer_sizes(1,
+ row, col,
+ data_size,
+ requested_bytes_per_frame,
+ &data_per_frame,
+ &pdi0_buffer_size,
+ &pdi1_buffer_size,
+ &num_frames);
+ if (ret < 0)
+ return ret;
+
+ dma_buffer_size = pdi0_buffer_size;
+
+ ret = sdw_cdns_prepare_read_dma_buffer(dev_num, start_register,
+ data_size,
+ data_per_frame,
+ dma_buffer, dma_buffer_size,
+ &total_dma_data_written);
+ if (ret < 0)
+ return ret;
+
+ print_hex_dump_debug("DMA data: ", DUMP_PREFIX_OFFSET,
+ 4, 4, dma_buffer, total_dma_data_written, false);
+
+ return 0;
+}
+EXPORT_SYMBOL(sdw_cdns_test_bra_data_block);
+
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("Cadence Soundwire Library");
diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
@@ -224,4 +224,6 @@ int sdw_cdns_prepare_read_dma_buffer(u8 dev_num, u32 start_register,
  u8 *dma_buffer, int dma_buffer_size,
  int *dma_buffer_total_bytes);
 
+int sdw_cdns_test_bra_data_block(void);
+
 #endif /* __SDW_CADENCE_H */