linux-kernel - [PATCH 3/3] mmc: mxs-mmc: call dmaengine API to set mmc->max

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Date:	Thu, 26 May 2011 14:31:33 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-arm-kernel@...ts.infradead.org>, <vinod.koul@...el.com>,
	<dan.j.williams@...el.com>, <patches@...aro.org>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH 3/3] mmc: mxs-mmc: call dmaengine API to set mmc->max_segs

With dmaengine API dma_get_max_seg_number added, we now can call
the API to get and number and then set mmc->max_segs instead of
hard-coding it.

Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
---
 drivers/mmc/host/mxs-mmc.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 99d39a6..d783af3 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -745,11 +745,15 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	mmc->f_max = 288000000;
 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 
-	mmc->max_segs = 52;
 	mmc->max_blk_size = 1 << 0xf;
 	mmc->max_blk_count = (ssp_is_old()) ? 0xff : 0xffffff;
 	mmc->max_req_size = (ssp_is_old()) ? 0xffff : 0xffffffff;
 	mmc->max_seg_size = dma_get_max_seg_size(host->dmach->device->dev);
+	/*
+	 * Reserve one segment for carrying on pio words to get dma engine
+	 * program mmc controller registers
+	 */
+	mmc->max_segs = dma_get_max_seg_number(host->dmach->device->dev) - 1;
 
 	platform_set_drvdata(pdev, mmc);
 
-- 
1.7.4.1


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