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From: Ludovic Desroches <ludovic.desroches@atmel.com>
To: linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: ulf.hansson@linaro.org, nicolas.ferre@atmel.com, arnd@arndb.de,
	Ludovic Desroches <ludovic.desroches@atmel.com>
Subject: [PATCH v4 4/4] mmc: atmel-mci: use probe deferring if dma controller is not ready yet
Date: Mon, 1 Dec 2014 15:35:09 +0100	[thread overview]
Message-ID: <1417444509-15501-5-git-send-email-ludovic.desroches@atmel.com> (raw)
In-Reply-To: <1417444509-15501-1-git-send-email-ludovic.desroches@atmel.com>

Return probe defer if requesting a dma channel without a dma controller
probed.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
---
 drivers/mmc/host/atmel-mci.c | 47 ++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 24 deletions(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 00f6088..1a8e30c 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -2272,29 +2272,24 @@ static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
 	mmc_free_host(slot->mmc);
 }
 
-static bool atmci_configure_dma(struct atmel_mci *host)
+static int atmci_configure_dma(struct atmel_mci *host)
 {
-	if (host == NULL)
-		return false;
+	host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev, "rxtx");
+	if (IS_ERR(host->dma.chan))
+		return PTR_ERR(host->dma.chan);
 
-	host->dma.chan = dma_request_slave_channel(&host->pdev->dev, "rxtx");
-	if (!host->dma.chan) {
-		dev_warn(&host->pdev->dev, "no DMA channel available\n");
-		return false;
-	} else {
-		dev_info(&host->pdev->dev,
-					"using %s for DMA transfers\n",
-					dma_chan_name(host->dma.chan));
-
-		host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
-		host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-		host->dma_conf.src_maxburst = 1;
-		host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
-		host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-		host->dma_conf.dst_maxburst = 1;
-		host->dma_conf.device_fc = false;
-		return true;
-	}
+	dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
+		 dma_chan_name(host->dma.chan));
+
+	host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
+	host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	host->dma_conf.src_maxburst = 1;
+	host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
+	host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	host->dma_conf.dst_maxburst = 1;
+	host->dma_conf.device_fc = false;
+
+	return 0;
 }
 
 /*
@@ -2411,7 +2406,10 @@ static int atmci_probe(struct platform_device *pdev)
 
 	/* Get MCI capabilities and set operations according to it */
 	atmci_get_cap(host);
-	if (atmci_configure_dma(host)) {
+	ret = atmci_configure_dma(host);
+	if (ret == -EPROBE_DEFER)
+		goto err_dma_probe_defer;
+	if (ret == 0) {
 		host->prepare_data = &atmci_prepare_data_dma;
 		host->submit_data = &atmci_submit_data_dma;
 		host->stop_transfer = &atmci_stop_transfer_dma;
@@ -2496,8 +2494,9 @@ err_init_slot:
 	pm_runtime_put_noidle(&pdev->dev);
 
 	del_timer_sync(&host->timer);
-	if (host->dma.chan)
+	if (!IS_ERR(host->dma.chan))
 		dma_release_channel(host->dma.chan);
+err_dma_probe_defer:
 	free_irq(irq, host);
 	return ret;
 }
@@ -2523,7 +2522,7 @@ static int atmci_remove(struct platform_device *pdev)
 	atmci_readl(host, ATMCI_SR);
 
 	del_timer_sync(&host->timer);
-	if (host->dma.chan)
+	if (!IS_ERR(host->dma.chan))
 		dma_release_channel(host->dma.chan);
 
 	free_irq(platform_get_irq(pdev, 0), host);
-- 
2.0.3


WARNING: multiple messages have this Message-ID (diff)
From: ludovic.desroches@atmel.com (Ludovic Desroches)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 4/4] mmc: atmel-mci: use probe deferring if dma controller is not ready yet
Date: Mon, 1 Dec 2014 15:35:09 +0100	[thread overview]
Message-ID: <1417444509-15501-5-git-send-email-ludovic.desroches@atmel.com> (raw)
In-Reply-To: <1417444509-15501-1-git-send-email-ludovic.desroches@atmel.com>

Return probe defer if requesting a dma channel without a dma controller
probed.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
---
 drivers/mmc/host/atmel-mci.c | 47 ++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 24 deletions(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 00f6088..1a8e30c 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -2272,29 +2272,24 @@ static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
 	mmc_free_host(slot->mmc);
 }
 
-static bool atmci_configure_dma(struct atmel_mci *host)
+static int atmci_configure_dma(struct atmel_mci *host)
 {
-	if (host == NULL)
-		return false;
+	host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev, "rxtx");
+	if (IS_ERR(host->dma.chan))
+		return PTR_ERR(host->dma.chan);
 
-	host->dma.chan = dma_request_slave_channel(&host->pdev->dev, "rxtx");
-	if (!host->dma.chan) {
-		dev_warn(&host->pdev->dev, "no DMA channel available\n");
-		return false;
-	} else {
-		dev_info(&host->pdev->dev,
-					"using %s for DMA transfers\n",
-					dma_chan_name(host->dma.chan));
-
-		host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
-		host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-		host->dma_conf.src_maxburst = 1;
-		host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
-		host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-		host->dma_conf.dst_maxburst = 1;
-		host->dma_conf.device_fc = false;
-		return true;
-	}
+	dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
+		 dma_chan_name(host->dma.chan));
+
+	host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
+	host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	host->dma_conf.src_maxburst = 1;
+	host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
+	host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	host->dma_conf.dst_maxburst = 1;
+	host->dma_conf.device_fc = false;
+
+	return 0;
 }
 
 /*
@@ -2411,7 +2406,10 @@ static int atmci_probe(struct platform_device *pdev)
 
 	/* Get MCI capabilities and set operations according to it */
 	atmci_get_cap(host);
-	if (atmci_configure_dma(host)) {
+	ret = atmci_configure_dma(host);
+	if (ret == -EPROBE_DEFER)
+		goto err_dma_probe_defer;
+	if (ret == 0) {
 		host->prepare_data = &atmci_prepare_data_dma;
 		host->submit_data = &atmci_submit_data_dma;
 		host->stop_transfer = &atmci_stop_transfer_dma;
@@ -2496,8 +2494,9 @@ err_init_slot:
 	pm_runtime_put_noidle(&pdev->dev);
 
 	del_timer_sync(&host->timer);
-	if (host->dma.chan)
+	if (!IS_ERR(host->dma.chan))
 		dma_release_channel(host->dma.chan);
+err_dma_probe_defer:
 	free_irq(irq, host);
 	return ret;
 }
@@ -2523,7 +2522,7 @@ static int atmci_remove(struct platform_device *pdev)
 	atmci_readl(host, ATMCI_SR);
 
 	del_timer_sync(&host->timer);
-	if (host->dma.chan)
+	if (!IS_ERR(host->dma.chan))
 		dma_release_channel(host->dma.chan);
 
 	free_irq(platform_get_irq(pdev, 0), host);
-- 
2.0.3

  parent reply	other threads:[~2014-12-01 14:36 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-01 14:35 [PATCH v4 0/4] mmc: atmel-mci: cleanup and probe deferring Ludovic Desroches
2014-12-01 14:35 ` Ludovic Desroches
2014-12-01 14:35 ` [PATCH v4 1/4] mmc: atmel-mci: remove useless DMA stuff for non-dt devices Ludovic Desroches
2014-12-01 14:35   ` Ludovic Desroches
2014-12-01 14:35 ` [PATCH v4 2/4] mmc: atmel-mci: remove __init/__exit attributes Ludovic Desroches
2014-12-01 14:35   ` Ludovic Desroches
2014-12-01 14:35 ` [PATCH v4 3/4] mmc: atmel-mci: stop using specific initcall Ludovic Desroches
2014-12-01 14:35   ` Ludovic Desroches
2014-12-01 14:35 ` Ludovic Desroches [this message]
2014-12-01 14:35   ` [PATCH v4 4/4] mmc: atmel-mci: use probe deferring if dma controller is not ready yet Ludovic Desroches
2014-12-02 10:10 ` [PATCH v4 0/4] mmc: atmel-mci: cleanup and probe deferring Ulf Hansson
2014-12-02 10:10   ` Ulf Hansson
2014-12-03  8:22   ` Ludovic Desroches
2014-12-03  8:22     ` Ludovic Desroches

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