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authorSimon Trimmer <[email protected]>2022-09-14 17:02:44 +0100
committerVinod Koul <[email protected]>2022-09-20 10:29:31 +0530
commitfbbc73a20f38dcadf8a250bc761962588cd91f7e (patch)
tree2ccfc44f16ed5f71d8346a1846c753496b7a4519
parent279e46bc298629b26436c90bd4b5d104cc1e0fb2 (diff)
soundwire: cadence: fix updating slave status when a bus has multiple peripherals
The cadence IP explicitly reports slave status changes with bits for each possible change. The function cdns_update_slave_status() attempts to translate this into the current status of each of the slaves. However when there are multiple peripherals on a bus any slave that did not have a status change when the work function ran would not have it's status updated - the array is initialised to a value that equates to UNATTACHED and this can cause spurious reports that slaves had dropped off the bus. In the case where a slave has no status change or has multiple status changes the value from the last PING command is used. Signed-off-by: Simon Trimmer <[email protected]> Signed-off-by: Richard Fitzgerald <[email protected]> Reviewed-by: Pierre-Louis Bossart <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Vinod Koul <[email protected]>
-rw-r--r--drivers/soundwire/cadence_master.c57
1 files changed, 25 insertions, 32 deletions
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 4fbb19557f5e..245191d22ccd 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -782,6 +782,7 @@ static int cdns_update_slave_status(struct sdw_cdns *cdns,
enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
bool is_slave = false;
u32 mask;
+ u32 val;
int i, set_status;
memset(status, 0, sizeof(status));
@@ -789,41 +790,38 @@ static int cdns_update_slave_status(struct sdw_cdns *cdns,
for (i = 0; i <= SDW_MAX_DEVICES; i++) {
mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
CDNS_MCP_SLAVE_STATUS_BITS;
- if (!mask)
- continue;
- is_slave = true;
set_status = 0;
- if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
- status[i] = SDW_SLAVE_RESERVED;
- set_status++;
- }
+ if (mask) {
+ is_slave = true;
- if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
- status[i] = SDW_SLAVE_ATTACHED;
- set_status++;
- }
-
- if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
- status[i] = SDW_SLAVE_ALERT;
- set_status++;
- }
+ if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
+ status[i] = SDW_SLAVE_RESERVED;
+ set_status++;
+ }
- if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
- status[i] = SDW_SLAVE_UNATTACHED;
- set_status++;
- }
+ if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
+ status[i] = SDW_SLAVE_ATTACHED;
+ set_status++;
+ }
- /* first check if Slave reported multiple status */
- if (set_status > 1) {
- u32 val;
+ if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
+ status[i] = SDW_SLAVE_ALERT;
+ set_status++;
+ }
- dev_warn_ratelimited(cdns->dev,
- "Slave %d reported multiple Status: %d\n",
- i, mask);
+ if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
+ status[i] = SDW_SLAVE_UNATTACHED;
+ set_status++;
+ }
+ }
- /* check latest status extracted from PING commands */
+ /*
+ * check that there was a single reported Slave status and when
+ * there is not use the latest status extracted from PING commands
+ */
+ if (set_status != 1) {
val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
val >>= (i * 2);
@@ -842,11 +840,6 @@ static int cdns_update_slave_status(struct sdw_cdns *cdns,
status[i] = SDW_SLAVE_RESERVED;
break;
}
-
- dev_warn_ratelimited(cdns->dev,
- "Slave %d status updated to %d\n",
- i, status[i]);
-
}
}