linux-kernel - [PATCH V2 03/27] mmc: mmci: convert dma

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Date:   Fri, 21 Sep 2018 11:45:57 +0200
From:   Ludovic Barre <ludovic.Barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <benjamin.gaignard@...aro.org>, Gerald Baeza <gerald.baeza@...com>,
        Loic Pallardy <loic.pallardy@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH V2 03/27] mmc: mmci: convert dma_setup callback to return an int

From: Ludovic Barre <ludovic.barre@...com>

This patch converts dma_setup callback to return an integer
This patch is needed to prepare sdmmc variant with internal dma

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 drivers/mmc/host/mmci.c          | 14 ++++++++++----
 drivers/mmc/host/mmci.h          |  2 +-
 drivers/mmc/host/mmci_qcom_dml.c |  6 ++++--
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index cbd67bc..2f845f3 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -415,7 +415,7 @@ static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
  * no custom DMA interfaces are supported.
  */
 #ifdef CONFIG_DMA_ENGINE
-static void mmci_dma_setup(struct mmci_host *host)
+static int mmci_dma_setup(struct mmci_host *host)
 {
 	const char *rxname, *txname;
 
@@ -466,7 +466,9 @@ static void mmci_dma_setup(struct mmci_host *host)
 	}
 
 	if (host->ops && host->ops->dma_setup)
-		host->ops->dma_setup(host);
+		return host->ops->dma_setup(host);
+
+	return 0;
 }
 
 /*
@@ -741,8 +743,10 @@ static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
 static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
 {
 }
-static inline void mmci_dma_setup(struct mmci_host *host)
+
+static inline int mmci_dma_setup(struct mmci_host *host)
 {
+	return 0;
 }
 
 static inline void mmci_dma_release(struct mmci_host *host)
@@ -1796,7 +1800,9 @@ static int mmci_probe(struct amba_device *dev,
 		 amba_rev(dev), (unsigned long long)dev->res.start,
 		 dev->irq[0], dev->irq[1]);
 
-	mmci_dma_setup(host);
+	ret = mmci_dma_setup(host);
+	if (ret)
+		goto clk_disable;
 
 	pm_runtime_set_autosuspend_delay(&dev->dev, 50);
 	pm_runtime_use_autosuspend(&dev->dev);
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 21aaf9a..06299ac 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -273,7 +273,7 @@ struct variant_data {
 
 /* mmci variant callbacks */
 struct mmci_host_ops {
-	void (*dma_setup)(struct mmci_host *host);
+	int (*dma_setup)(struct mmci_host *host);
 };
 
 struct mmci_host_next {
diff --git a/drivers/mmc/host/mmci_qcom_dml.c b/drivers/mmc/host/mmci_qcom_dml.c
index be3fab5..1bb59cf 100644
--- a/drivers/mmc/host/mmci_qcom_dml.c
+++ b/drivers/mmc/host/mmci_qcom_dml.c
@@ -119,7 +119,7 @@ static int of_get_dml_pipe_index(struct device_node *np, const char *name)
 }
 
 /* Initialize the dml hardware connected to SD Card controller */
-static void qcom_dma_setup(struct mmci_host *host)
+static int qcom_dma_setup(struct mmci_host *host)
 {
 	u32 config;
 	void __iomem *base;
@@ -131,7 +131,7 @@ static void qcom_dma_setup(struct mmci_host *host)
 
 	if (producer_id < 0 || consumer_id < 0) {
 		host->variant->qcom_dml = false;
-		return;
+		return -EINVAL;
 	}
 
 	base = host->base + DML_OFFSET;
@@ -175,6 +175,8 @@ static void qcom_dma_setup(struct mmci_host *host)
 
 	/* Make sure dml initialization is finished */
 	mb();
+
+	return 0;
 }
 
 static struct mmci_host_ops qcom_variant_ops = {
-- 
2.7.4