linux-kernel - [PATCH v2 2/3] mmc: host: sdhci: Implement the request

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Date:   Tue, 17 Mar 2020 18:14:10 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com, baolin.wang7@...il.com,
        arnd@...db.de, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] mmc: host: sdhci: Implement the request_atomic() API

Implement the request_atomic() ops for the sdhci driver to process
one request in the atomic context if the card is nonremovable.

Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/mmc/host/sdhci.c | 27 +++++++++++++++++++--------
 drivers/mmc/host/sdhci.h |  1 +
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9c37451..4febbcb 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2016,17 +2016,12 @@ void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
  *                                                                           *
 \*****************************************************************************/
 
-void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+static void sdhci_start_request(struct mmc_host *mmc, struct mmc_request *mrq,
+				int present)
 {
-	struct sdhci_host *host;
-	int present;
+	struct sdhci_host *host = mmc_priv(mmc);
 	unsigned long flags;
 
-	host = mmc_priv(mmc);
-
-	/* Firstly check card presence */
-	present = mmc->ops->get_cd(mmc);
-
 	spin_lock_irqsave(&host->lock, flags);
 
 	sdhci_led_activate(host);
@@ -2043,6 +2038,22 @@ void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 
 	spin_unlock_irqrestore(&host->lock, flags);
 }
+
+void sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	sdhci_start_request(mmc, mrq, 1);
+}
+EXPORT_SYMBOL_GPL(sdhci_request_atomic);
+
+void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	int present;
+
+	/* Firstly check card presence */
+	present = mmc->ops->get_cd(mmc);
+
+	sdhci_start_request(mmc, mrq, present);
+}
 EXPORT_SYMBOL_GPL(sdhci_request);
 
 void sdhci_set_bus_width(struct sdhci_host *host, int width)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index cac2d97..5507a73 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -775,6 +775,7 @@ void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
 void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
 			   unsigned short vdd);
 void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq);
+void sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq);
 void sdhci_set_bus_width(struct sdhci_host *host, int width);
 void sdhci_reset(struct sdhci_host *host, u8 mask);
 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
-- 
1.9.1