This is a note to let you know that I've just added the patch titled
dmaengine: at_xdmac: disable/enable clock directly on suspend/resume
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dmaengine-at_xdmac-disable-enable-clock-directly-on-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 024bbf116ed34702a8bfa8f983a0b6fed9194a38
Author: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
Date: Tue Feb 14 17:18:21 2023 +0200
dmaengine: at_xdmac: disable/enable clock directly on suspend/resume
[ Upstream commit 2de5ddb5e68c94b781b3789bca1ce52000d7d0e0 ]
Runtime PM APIs for at_xdmac just plays with clk_enable()/clk_disable()
letting aside the clk_prepare()/clk_unprepare() that needs to be
executed as the clock is also prepared on probe. Thus instead of using
runtime PM force suspend/resume APIs use
clk_disable_unprepare() + pm_runtime_put_noidle() on suspend and
clk_prepare_enable() + pm_runtime_get_noresume() on resume. This
approach as been chosen instead of using runtime PM force suspend/resume
with clk_unprepare()/clk_prepare() as it looks simpler and the final
code is better.
While at it added the missing pm_runtime_mark_last_busy() on suspend before
decrementing the reference counter.
Fixes: 650b0e990cbd ("dmaengine: at_xdmac: add runtime pm support")
Signed-off-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230214151827.1050280-2-claudiu.beznea@xxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Stable-dep-of: 44fe8440bda5 ("dmaengine: at_xdmac: do not resume channels paused by consumers")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index f9aa5396c0f8e..af52429af9172 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1992,6 +1992,7 @@ static int atmel_xdmac_suspend(struct device *dev)
at_xdmac_off(atxdmac);
clk_disable_unprepare(atxdmac->clk);
+
return 0;
}
@@ -2008,6 +2009,8 @@ static int atmel_xdmac_resume(struct device *dev)
if (ret)
return ret;
+ pm_runtime_get_noresume(atxdmac->dev);
+
at_xdmac_axi_config(pdev);
/* Clear pending interrupts. */
