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mmc: dw_mmc: amend use of idmac sw reset

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First, compiling warning along with previous change is removed.
[drivers/mmc/host/dw_mmc.c:1890:7: warning: unused variable 'ctrl']
And with the recommendation in manual, IDMAC software reset is followed
by dma-reset of the CTRL register in order to terminate the transfer.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Seungwon Jeon 2013-08-31 00:14:33 +09:00 committed by Chris Ball
parent 31bff450d2
commit 5ce9d96177
1 changed files with 11 additions and 6 deletions
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17
drivers/mmc/host/dw_mmc.c
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@ -372,6 +372,14 @@ static void dw_mci_dma_cleanup(struct dw_mci *host)
dw_mci_get_dma_dir(data));
}
static void dw_mci_idmac_reset(struct dw_mci *host)
{
u32 bmod = mci_readl(host, BMOD);
/* Software reset of DMA */
bmod |= SDMMC_IDMAC_SWRESET;
mci_writel(host, BMOD, bmod);
}
static void dw_mci_idmac_stop_dma(struct dw_mci *host)
{
u32 temp;
@ -385,6 +393,7 @@ static void dw_mci_idmac_stop_dma(struct dw_mci *host)
/* Stop the IDMAC running */
temp = mci_readl(host, BMOD);
temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
temp |= SDMMC_IDMAC_SWRESET;
mci_writel(host, BMOD, temp);
}
@ -476,7 +485,7 @@ static int dw_mci_idmac_init(struct dw_mci *host)
p->des3 = host->sg_dma;
p->des0 = IDMAC_DES0_ER;
mci_writel(host, BMOD, SDMMC_IDMAC_SWRESET);
dw_mci_idmac_reset(host);
/* Mask out interrupts - get Tx & Rx complete only */
mci_writel(host, IDSTS, IDMAC_INT_CLR);
@ -1906,7 +1915,6 @@ static void dw_mci_work_routine_card(struct work_struct *work)
struct mmc_host *mmc = slot->mmc;
struct mmc_request *mrq;
int present;
u32 ctrl;
present = dw_mci_get_cd(mmc);
while (present != slot->last_detect_state) {
@ -1974,10 +1982,7 @@ static void dw_mci_work_routine_card(struct work_struct *work)
/* Clear down the FIFO */
dw_mci_fifo_reset(host);
#ifdef CONFIG_MMC_DW_IDMAC
ctrl = mci_readl(host, BMOD);
/* Software reset of DMA */
ctrl |= SDMMC_IDMAC_SWRESET;
mci_writel(host, BMOD, ctrl);
dw_mci_idmac_reset(host);
#endif
}