slimbus: ngd: reset dma setup during runtime pm

[ Upstream commit d77772538f00b7265deace6e77e555ee18365ad0 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index b60541c3f72daee77e6ddcec1f1fc873d06bc444..09ecd1fb24ae3530a7349bed252c135d9fd52eb6 100644 (file)
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1061,7 +1061,8 @@ 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 */
@@ -1112,6 +1113,7 @@ 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;
        }
 
@@ -1500,6 +1502,7 @@ 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;