From 807c15bc77871c695e254423f5e3839b2175db03 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Mon, 16 Sep 2019 14:23:47 -0500
Subject: [PATCH] soundwire: intel: don't filter out PDI0/1
Git-commit: 807c15bc77871c695e254423f5e3839b2175db03
Patch-mainline: v5.5-rc1
References: jsc#SLE-16518

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>
Link: https://lore.kernel.org/r/20190916192348.467-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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 52ce380482b2..13ca305adf00 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
 
 /*
@@ -279,11 +276,7 @@ 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,
@@ -851,11 +844,8 @@ 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);
@@ -882,7 +872,6 @@ 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)
@@ -899,6 +888,9 @@ 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;
 
@@ -1177,12 +1169,13 @@ 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;
@@ -1232,13 +1225,13 @@ 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;
-- 
2.16.4