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@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index c877dedf23d26f340477d2735d76fdfb50d95789..385816375614b5585e61e0dbdd85af79a3dbdd41 100644 (file)
--- 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,