linux-kernel - [PATCH v9 1/2] mmc: dw_mmc: move controller reset before driver init

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Message-ID: <20170809032519.96219-1-liwei213@huawei.com>
Date:   Wed, 9 Aug 2017 11:25:18 +0800
From:   Li Wei <liwei213@...wei.com>
To:     <ulf.hansson@...aro.org>, <adrian.hunter@...el.com>,
        <jh80.chung@...sung.com>, <shawn.lin@...k-chips.com>,
        <wsa+renesas@...g-engineering.com>, <hkallweit1@...il.com>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <guodong.xu@...aro.org>
Subject: [PATCH v9 1/2] mmc: dw_mmc: move controller reset before driver init

This commit modifies dw_mci_probe(), it moves reset assertion before
drv_data->init(host)

Some driver needs to access controller registers in its .init() ops. So,
in order to make such access safe, we should do controller reset before
.init() being called.

Signed-off-by: Wei Li <liwei213@...wei.com>
Signed-off-by: Guodong Xu <guodong.xu@...aro.org>
Signed-off-by: Chen Jun <chenjun14@...wei.com>
---
 drivers/mmc/host/dw_mmc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index a9dfb26972f2..f2fa928e1a12 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -3067,6 +3067,12 @@ int dw_mci_probe(struct dw_mci *host)
 		goto err_clk_ciu;
 	}
 
+	if (!IS_ERR(host->pdata->rstc)) {
+		reset_control_assert(host->pdata->rstc);
+		usleep_range(10, 50);
+		reset_control_deassert(host->pdata->rstc);
+	}
+
 	if (drv_data && drv_data->init) {
 		ret = drv_data->init(host);
 		if (ret) {
@@ -3076,12 +3082,6 @@ int dw_mci_probe(struct dw_mci *host)
 		}
 	}
 
-	if (!IS_ERR(host->pdata->rstc)) {
-		reset_control_assert(host->pdata->rstc);
-		usleep_range(10, 50);
-		reset_control_deassert(host->pdata->rstc);
-	}
-
 	setup_timer(&host->cmd11_timer,
 		    dw_mci_cmd11_timer, (unsigned long)host);
 
-- 
2.11.0