linux-kernel - [PATCH V2 01/27] mmc: mmci: internalize dma map/unmap into mmci dma functions

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Message-ID: <1537523181-14578-2-git-send-email-ludovic.Barre@st.com>
Date:   Fri, 21 Sep 2018 11:45:55 +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 01/27] mmc: mmci: internalize dma map/unmap into mmci dma functions

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

This patch internalizes the management of dma map/unmap into
mmci dma interfaces. This allows to simplify and prepare the next dma
callbacks for mmci host ops.
mmci_dma_unmap was called in mmci_data_irq & mmci_cmd_irq functions
and can be integrated in mmci_dma_data_error.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 drivers/mmc/host/mmci.c | 40 +++++++++++++++++-----------------------
 1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 1841d250..bf0bb07 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -482,16 +482,6 @@ static inline void mmci_dma_release(struct mmci_host *host)
 	host->dma_rx_channel = host->dma_tx_channel = NULL;
 }
 
-static void mmci_dma_data_error(struct mmci_host *host)
-{
-	dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
-	dmaengine_terminate_all(host->dma_current);
-	host->dma_in_progress = false;
-	host->dma_current = NULL;
-	host->dma_desc_current = NULL;
-	host->data->host_cookie = 0;
-}
-
 static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
 {
 	struct dma_chan *chan;
@@ -505,6 +495,18 @@ static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
 		     mmc_get_dma_dir(data));
 }
 
+static void mmci_dma_data_error(struct mmci_host *host)
+{
+	dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
+	dmaengine_terminate_all(host->dma_current);
+	host->dma_in_progress = false;
+	host->dma_current = NULL;
+	host->dma_desc_current = NULL;
+	host->data->host_cookie = 0;
+
+	mmci_dma_unmap(host, host->data);
+}
+
 static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
 {
 	u32 status;
@@ -528,10 +530,9 @@ static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
 		mmci_dma_data_error(host);
 		if (!data->error)
 			data->error = -EIO;
-	}
-
-	if (!data->host_cookie)
+	} else if (!data->host_cookie) {
 		mmci_dma_unmap(host, data);
+	}
 
 	/*
 	 * Use of DMA with scatter-gather is impossible.
@@ -742,10 +743,6 @@ static inline void mmci_dma_release(struct mmci_host *host)
 {
 }
 
-static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
-{
-}
-
 static inline void mmci_dma_finalize(struct mmci_host *host,
 				     struct mmc_data *data)
 {
@@ -906,10 +903,8 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 		u32 remain, success;
 
 		/* Terminate the DMA transfer */
-		if (dma_inprogress(host)) {
+		if (dma_inprogress(host))
 			mmci_dma_data_error(host);
-			mmci_dma_unmap(host, data);
-		}
 
 		/*
 		 * Calculate how far we are into the transfer.  Note that
@@ -1055,10 +1050,9 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
 	if ((!sbc && !cmd->data) || cmd->error) {
 		if (host->data) {
 			/* Terminate the DMA transfer */
-			if (dma_inprogress(host)) {
+			if (dma_inprogress(host))
 				mmci_dma_data_error(host);
-				mmci_dma_unmap(host, host->data);
-			}
+
 			mmci_stop_data(host);
 		}
 		mmci_request_end(host, host->mrq);
-- 
2.7.4