lkml.org 
[lkml]   [2019]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 05/11] soundwire: intel: don't filter out PDI0/1
Date
PDI0/1 are reserved for Bulk and filtered out in the existing code.
That leads to endless confusions on whether the index is the raw or
corrected one. In addition we will need support for Bulk at some point
so it's just simpler to expose those PDIs and not use it for now than
try to be smart unless we have to remove the smarts.

This patch requires a topology change to use PDIs starting at offset 2
explicitly.

Note that there is a known discrepancy between hardware documentation
and what ALH stream works in practice, future fixes are likely.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/cadence_master.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index fcab2e2f4249..8510d4ee8044 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -183,9 +183,6 @@ MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
#define CDNS_DEFAULT_SSP_INTERVAL 0x18
#define CDNS_TX_TIMEOUT 2000

-#define CDNS_PCM_PDI_OFFSET 0x2
-#define CDNS_PDM_PDI_OFFSET 0x6
-
#define CDNS_SCP_RX_FIFOLEVEL 0x2

/*
@@ -295,11 +292,7 @@ static int cdns_reg_show(struct seq_file *s, void *data)
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn B0 Registers\n");

- /*
- * in sdw_cdns_pdi_init() we filter out the Bulk PDIs,
- * so the indices need to be corrected again
- */
- num_ports = cdns->num_ports + CDNS_PCM_PDI_OFFSET;
+ num_ports = cdns->num_ports;

for (i = 0; i < num_ports; i++) {
ret += scnprintf(buf + ret, RD_BUF - ret,
@@ -912,11 +905,8 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
/* Allocate PDIs for PCMs */
stream = &cdns->pcm;

- /* First two PDIs are reserved for bulk transfers */
- if (stream->num_bd < CDNS_PCM_PDI_OFFSET)
- return -EINVAL;
- stream->num_bd -= CDNS_PCM_PDI_OFFSET;
- offset = CDNS_PCM_PDI_OFFSET;
+ /* we allocate PDI0 and PDI1 which are used for Bulk */
+ offset = 0;

ret = cdns_allocate_pdi(cdns, &stream->bd,
stream->num_bd, offset);
@@ -934,6 +924,9 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,

ret = cdns_allocate_pdi(cdns, &stream->out,
stream->num_out, offset);
+
+ offset += stream->num_out;
+
if (ret)
return ret;

@@ -943,7 +936,6 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,

/* Allocate PDIs for PDMs */
stream = &cdns->pdm;
- offset = CDNS_PDM_PDI_OFFSET;
ret = cdns_allocate_pdi(cdns, &stream->bd,
stream->num_bd, offset);
if (ret)
@@ -1240,12 +1232,13 @@ EXPORT_SYMBOL(cdns_set_sdw_stream);
* Find and return a free PDI for a given PDI array
*/
static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
+ unsigned int offset,
unsigned int num,
struct sdw_cdns_pdi *pdi)
{
int i;

- for (i = 0; i < num; i++) {
+ for (i = offset; i < num; i++) {
if (pdi[i].assigned)
continue;
pdi[i].assigned = true;
@@ -1295,13 +1288,13 @@ struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
struct sdw_cdns_pdi *pdi = NULL;

if (dir == SDW_DATA_DIR_RX)
- pdi = cdns_find_pdi(cdns, stream->num_in, stream->in);
+ pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in);
else
- pdi = cdns_find_pdi(cdns, stream->num_out, stream->out);
+ pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out);

/* check if we found a PDI, else find in bi-directional */
if (!pdi)
- pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd);
+ pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd);

if (pdi) {
pdi->l_ch_num = 0;
--
2.20.1
\
 
 \ /
  Last update: 2019-08-21 22:06    [W:0.076 / U:2.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site