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mmc: dw_mmc: use the cookie's enum values for post/pre_req()

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This patch removed the meaningless value. Instead, use the cookie's enum
values for executing correctly.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jaehoon Chung 2016-11-17 16:40:38 +09:00 committed by Ulf Hansson
parent e13c3c0818
commit a4cc7eb441
2 changed files with 25 additions and 20 deletions
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39
drivers/mmc/host/dw_mmc.c
View file

@ -414,12 +414,13 @@ static void dw_mci_dma_cleanup(struct dw_mci *host)
{
struct mmc_data *data = host->data;
if (data)
if (!data->host_cookie)
dma_unmap_sg(host->dev,
data->sg,
data->sg_len,
dw_mci_get_dma_dir(data));
if (data && data->host_cookie == COOKIE_MAPPED) {
dma_unmap_sg(host->dev,
data->sg,
data->sg_len,
dw_mci_get_dma_dir(data));
data->host_cookie = COOKIE_UNMAPPED;
}
}
static void dw_mci_idmac_reset(struct dw_mci *host)
@ -850,13 +851,13 @@ static const struct dw_mci_dma_ops dw_mci_edmac_ops = {
static int dw_mci_pre_dma_transfer(struct dw_mci *host,
struct mmc_data *data,
bool next)
int cookie)
{
struct scatterlist *sg;
unsigned int i, sg_len;
if (!next && data->host_cookie)
return data->host_cookie;
if (data->host_cookie == COOKIE_PRE_MAPPED)
return data->sg_len;
/*
* We don't do DMA on "complex" transfers, i.e. with
@ -881,8 +882,7 @@ static int dw_mci_pre_dma_transfer(struct dw_mci *host,
if (sg_len == 0)
return -EINVAL;
if (next)
data->host_cookie = sg_len;
data->host_cookie = cookie;
return sg_len;
}
@ -897,13 +897,12 @@ static void dw_mci_pre_req(struct mmc_host *mmc,
if (!slot->host->use_dma || !data)
return;
if (data->host_cookie) {
data->host_cookie = 0;
return;
}
/* This data might be unmapped at this time */
data->host_cookie = COOKIE_UNMAPPED;
if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
data->host_cookie = 0;
if (dw_mci_pre_dma_transfer(slot->host, mrq->data,
COOKIE_PRE_MAPPED) < 0)
data->host_cookie = COOKIE_UNMAPPED;
}
static void dw_mci_post_req(struct mmc_host *mmc,
@ -916,12 +915,12 @@ static void dw_mci_post_req(struct mmc_host *mmc,
if (!slot->host->use_dma || !data)
return;
if (data->host_cookie)
if (data->host_cookie != COOKIE_UNMAPPED)
dma_unmap_sg(slot->host->dev,
data->sg,
data->sg_len,
dw_mci_get_dma_dir(data));
data->host_cookie = 0;
data->host_cookie = COOKIE_UNMAPPED;
}
static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
@ -1027,7 +1026,7 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
if (!host->use_dma)
return -ENODEV;
sg_len = dw_mci_pre_dma_transfer(host, data, 0);
sg_len = dw_mci_pre_dma_transfer(host, data, COOKIE_MAPPED);
if (sg_len < 0) {
host->dma_ops->stop(host);
return sg_len;

6
include/linux/mmc/dw_mmc.h
View file

@ -39,6 +39,12 @@ enum {
EVENT_DATA_ERROR,
};
enum dw_mci_cookie {
COOKIE_UNMAPPED,
COOKIE_PRE_MAPPED, /* mapped by pre_req() of dwmmc */
COOKIE_MAPPED, /* mapped by prepare_data() of dwmmc */
};
struct mmc_data;
enum {