soc: avoid unnecessary attempts during SSR

as part of swrm_runtime_suspend, multiple attempts are made
to write into swr regisers. Incase of SSR state, all those write
 attempts are bound to fail.
Hence avoid swr read/write operations during SSR state.
Also move updating dev_up flag for SSR event to an early point in call flow.

Change-Id: I805d1ccf8bcdab5fdde7b74582a65463d5bcbd6e
Signed-off-by: Prasad Kumpatla <[email protected]>

soc/swr-mstr-ctrl.c

@@ -3395,6 +3395,8 @@ static int swrm_runtime_suspend(struct device *dev)
 		if (!swrm->clk_stop_mode0_supp || swrm->state == SWR_MSTR_SSR) {
 			dev_err_ratelimited(dev, "%s: clk stop mode not supported or SSR entry\n",
 				__func__);
+			if (swrm->state == SWR_MSTR_SSR)
+				goto chk_lnk_status;
 			mutex_unlock(&swrm->reslock);
 			enable_bank_switch(swrm, 0, SWR_ROW_50, SWR_MIN_COL);
 			mutex_lock(&swrm->reslock);
@@ -3434,6 +3436,7 @@ static int swrm_runtime_suspend(struct device *dev)
 			mutex_lock(&swrm->reslock);
 			usleep_range(100, 105);
 		}
+chk_lnk_status:
 		if (!swrm_check_link_status(swrm, 0x0))
 			dev_dbg(dev, "%s:failed in disconnecting, ssr?\n",
 				__func__);
@@ -3689,13 +3692,15 @@ int swrm_wcd_notify(struct platform_device *pdev, u32 id, void *data)
 	case SWR_DEVICE_SSR_DOWN:
 		trace_printk("%s: swr device down called\n", __func__);
 		mutex_lock(&swrm->mlock);
+		mutex_lock(&swrm->devlock);
+		swrm->dev_up = false;
+		mutex_unlock(&swrm->devlock);
 		if (swrm->state == SWR_MSTR_DOWN)
 			dev_dbg(swrm->dev, "%s:SWR master is already Down:%d\n",
 				__func__, swrm->state);
 		else
 			swrm_device_down(&pdev->dev);
 		mutex_lock(&swrm->devlock);
-		swrm->dev_up = false;
 		if (swrm->hw_core_clk_en)
 			digital_cdc_rsc_mgr_hw_vote_disable(
 				swrm->lpass_core_hw_vote, swrm->dev);