patch "slimbus: ngd: reset dma setup during runtime pm" added to char-misc-linus

patch "slimbus: ngd: reset dma setup during runtime pm" added to char-misc-linus

[gregkh]

This is a note to let you know that I've just added the patch titled

    slimbus: ngd: reset dma setup during runtime pm

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.

If you have any questions about this process, please let me know.


From d77772538f00b7265deace6e77e555ee18365ad0 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Date: Mon, 9 Aug 2021 09:24:28 +0100
Subject: slimbus: ngd: reset dma setup during runtime pm

During suspend/resume NGD remote instance is power cycled along
with remotely controlled bam dma engine.
So Reset the dma configuration during this suspend resume path
so that we are not dealing with any stale dma setup.

Without this transactions timeout after first suspend resume path.

Fixes: 917809e2280b ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210809082428.11236-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index f3ee8e036372..7040293c2ee8 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1080,7 +1080,8 @@ static void qcom_slim_ngd_setup(struct qcom_slim_ngd_ctrl *ctrl)
 {
 	u32 cfg = readl_relaxed(ctrl->ngd->base);
 
-	if (ctrl->state == QCOM_SLIM_NGD_CTRL_DOWN)
+	if (ctrl->state == QCOM_SLIM_NGD_CTRL_DOWN ||
+		ctrl->state == QCOM_SLIM_NGD_CTRL_ASLEEP)
 		qcom_slim_ngd_init_dma(ctrl);
 
 	/* By default enable message queues */
@@ -1131,6 +1132,7 @@ static int qcom_slim_ngd_power_up(struct qcom_slim_ngd_ctrl *ctrl)
 			dev_info(ctrl->dev, "Subsys restart: ADSP active framer\n");
 			return 0;
 		}
+		qcom_slim_ngd_setup(ctrl);
 		return 0;
 	}
 
@@ -1618,6 +1620,7 @@ static int __maybe_unused qcom_slim_ngd_runtime_suspend(struct device *dev)
 	struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
 	int ret = 0;
 
+	qcom_slim_ngd_exit_dma(ctrl);
 	if (!ctrl->qmi.handle)
 		return 0;
 
-- 
2.32.0