linux-kernel - [PATCH mmc-next v2 1/3] mmc: sdhci: add adma_table_num member to struct sdhci

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Message-ID: <20180726151207.6d8898f4@xhacker.debian>
Date:   Thu, 26 Jul 2018 15:12:07 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH mmc-next v2 1/3] mmc: sdhci: add adma_table_num member to
 struct sdhci_host

This patch adds adma_table_num member to struct sdhci_host to give more
flexibility to drivers to control the ADMA table number.

Default value of adma_table_num is set to (SDHCI_MAX_SEGS * 2 + 1).

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 drivers/mmc/host/sdhci.c | 17 +++++++++--------
 drivers/mmc/host/sdhci.h |  2 ++
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a7b5602ef6f7..14dd4a49e03b 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3316,6 +3316,13 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
 
 	host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
 
+	/*
+	 * The DMA descriptor table number is calculated as the maximum
+	 * number of segments times 2, to allow for an alignment
+	 * descriptor for each segment, plus 1 for a nop end descriptor.
+	 */
+	host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1;
+
 	return host;
 }
 
@@ -3561,18 +3568,12 @@ int sdhci_setup_host(struct sdhci_host *host)
 		dma_addr_t dma;
 		void *buf;
 
-		/*
-		 * The DMA descriptor table size is calculated as the maximum
-		 * number of segments times 2, to allow for an alignment
-		 * descriptor for each segment, plus 1 for a nop end descriptor,
-		 * all multipled by the descriptor size.
-		 */
 		if (host->flags & SDHCI_USE_64_BIT_DMA) {
-			host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
+			host->adma_table_sz = host->adma_table_num *
 					      SDHCI_ADMA2_64_DESC_SZ;
 			host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
 		} else {
-			host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
+			host->adma_table_sz = host->adma_table_num *
 					      SDHCI_ADMA2_32_DESC_SZ;
 			host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
 		}
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 23966f887da6..d55fd7033e93 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -563,6 +563,8 @@ struct sdhci_host {
 	/* Host SDMA buffer boundary. */
 	u32			sdma_boundary;
 
+	u32			adma_table_num;
+
 	u64			data_timeout;
 
 	unsigned long private[0] ____cacheline_aligned;
-- 
2.18.0