diff mbox series

[v17,3/6] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data

Message ID 1586703004-13674-4-git-send-email-mkshah@codeaurora.org (mailing list archive)
State New, archived
Headers show
Series Invoke rpmh_flush for non OSI targets | expand

Commit Message

Maulik Shah April 12, 2020, 2:50 p.m. UTC 
TCSes have previously programmed data when rpmh_flush() is called.
This can cause old data to trigger along with newly flushed.

Fix this by cleaning SLEEP and WAKE TCSes before new data is flushed.

With this there is no need to invoke rpmh_rsc_invalidate() call from
rpmh_invalidate().

Simplify rpmh_invalidate() by moving invalidate_batch() inside.

Fixes: 600513dfeef3 ("drivers: qcom: rpmh: cache sleep/wake state requests")
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---
 drivers/soc/qcom/rpmh.c | 41 ++++++++++++++++++-----------------------
 1 file changed, 18 insertions(+), 23 deletions(-)

Comments

Stephen Boyd April 13, 2020, 9:17 p.m. UTC | #1 
Quoting Maulik Shah (2020-04-12 07:50:01)
> TCSes have previously programmed data when rpmh_flush() is called.
> This can cause old data to trigger along with newly flushed.
> 
> Fix this by cleaning SLEEP and WAKE TCSes before new data is flushed.
> 
> With this there is no need to invoke rpmh_rsc_invalidate() call from
> rpmh_invalidate().
> 
> Simplify rpmh_invalidate() by moving invalidate_batch() inside.
> 
> Fixes: 600513dfeef3 ("drivers: qcom: rpmh: cache sleep/wake state requests")
> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
diff mbox series

Patch

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index 03630ae..a75f3df 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -317,19 +317,6 @@  static int flush_batch(struct rpmh_ctrlr *ctrlr)
 	return ret;
 }
 
-static void invalidate_batch(struct rpmh_ctrlr *ctrlr)
-{
-	struct batch_cache_req *req, *tmp;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctrlr->cache_lock, flags);
-	list_for_each_entry_safe(req, tmp, &ctrlr->batch_cache, list)
-		kfree(req);
-	INIT_LIST_HEAD(&ctrlr->batch_cache);
-	ctrlr->dirty = true;
-	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
-}
-
 /**
  * rpmh_write_batch: Write multiple sets of RPMH commands and wait for the
  * batch to finish.
@@ -467,6 +454,13 @@  int rpmh_flush(struct rpmh_ctrlr *ctrlr)
 		return 0;
 	}
 
+	/* Invalidate the TCSes first to avoid stale data */
+	do {
+		ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
+	} while (ret == -EAGAIN);
+	if (ret)
+		return ret;
+
 	/* First flush the cached batch requests */
 	ret = flush_batch(ctrlr);
 	if (ret)
@@ -498,24 +492,25 @@  int rpmh_flush(struct rpmh_ctrlr *ctrlr)
 }
 
 /**
- * rpmh_invalidate: Invalidate all sleep and active sets
- * sets.
+ * rpmh_invalidate: Invalidate sleep and wake sets in batch_cache
  *
  * @dev: The device making the request
  *
- * Invalidate the sleep and active values in the TCS blocks.
+ * Invalidate the sleep and wake values in batch_cache.
  */
 int rpmh_invalidate(const struct device *dev)
 {
 	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
-	int ret;
-
-	invalidate_batch(ctrlr);
+	struct batch_cache_req *req, *tmp;
+	unsigned long flags;
 
-	do {
-		ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
-	} while (ret == -EAGAIN);
+	spin_lock_irqsave(&ctrlr->cache_lock, flags);
+	list_for_each_entry_safe(req, tmp, &ctrlr->batch_cache, list)
+		kfree(req);
+	INIT_LIST_HEAD(&ctrlr->batch_cache);
+	ctrlr->dirty = true;
+	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
 
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(rpmh_invalidate);