linux-kernel - [PATCH v3 05/10] mmc: mediatek: fix got GPD checksum error interrupt when data transfer

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Date:	Tue, 27 Oct 2015 14:24:25 +0800
From:	Chaotian Jing <chaotian.jing@...iatek.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	<linux-mediatek@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Barry Song <baohua@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Howard Chen <ibanezchen@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kristina Martsenko <kristina.martsenko@...il.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Minda Chen <Minda.Chen@....com>,
	Dong Aisheng <b29396@...escale.com>,
	Johan Derycke <johan.derycke@...co.com>,
	Haibo Chen <haibo.chen@...escale.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Georgi Djakov <georgi.djakov@...aro.org>,
	<ivan.ivanov@...aro.org>, Weijun Yang <Weijun.Yang@....com>,
	Kevin Hao <haokexin@...il.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mmc@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<srv_heupstream@...iatek.com>
Subject: [PATCH v3 05/10] mmc: mediatek: fix got GPD checksum error interrupt when data transfer

Even if we only use one gpd, we need alloc 2 gpd and make
the gpd->next pointer to the second gpd, or may get gpd checksum
error, this was checked by hardware

Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
---
 drivers/mmc/host/mtk-sd.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index c877ded..3858163 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1145,11 +1145,14 @@ static void msdc_init_gpd_bd(struct msdc_host *host, struct msdc_dma *dma)
 	struct mt_bdma_desc *bd = dma->bd;
 	int i;
 
-	memset(gpd, 0, sizeof(struct mt_gpdma_desc));
+	memset(gpd, 0, sizeof(struct mt_gpdma_desc) * 2);
 
 	gpd->gpd_info = GPDMA_DESC_BDP; /* hwo, cs, bd pointer */
 	gpd->ptr = (u32)dma->bd_addr; /* physical address */
-
+	/* gpd->next is must set for desc DMA
+	 * That's why must alloc 2 gpd structure.
+	 */
+	gpd->next = (u32)dma->gpd_addr + sizeof(struct mt_gpdma_desc);
 	memset(bd, 0, sizeof(struct mt_bdma_desc) * MAX_BD_NUM);
 	for (i = 0; i < (MAX_BD_NUM - 1); i++)
 		bd[i].next = (u32)dma->bd_addr + sizeof(*bd) * (i + 1);
@@ -1306,7 +1309,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
 
 	host->timeout_clks = 3 * 1048576;
 	host->dma.gpd = dma_alloc_coherent(&pdev->dev,
-				sizeof(struct mt_gpdma_desc),
+				2 * sizeof(struct mt_gpdma_desc),
 				&host->dma.gpd_addr, GFP_KERNEL);
 	host->dma.bd = dma_alloc_coherent(&pdev->dev,
 				MAX_BD_NUM * sizeof(struct mt_bdma_desc),
@@ -1347,7 +1350,7 @@ release:
 release_mem:
 	if (host->dma.gpd)
 		dma_free_coherent(&pdev->dev,
-			sizeof(struct mt_gpdma_desc),
+			2 * sizeof(struct mt_gpdma_desc),
 			host->dma.gpd, host->dma.gpd_addr);
 	if (host->dma.bd)
 		dma_free_coherent(&pdev->dev,
-- 
1.8.1.1.dirty

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