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mmc: dw_mmc: use macro to define ring buffer size

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It's very prone to make mistake as we might forget
to replace all PAGE_SIZEs with new values if we try
to modify the ring buffer size for whatever reasons.
Let's use a macro to define it.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-09-02 12:14:39 +08:00 committed by Ulf Hansson
parent d12d0cb1d7
commit cc190d4c64
1 changed files with 10 additions and 5 deletions
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15
drivers/mmc/host/dw_mmc.c
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@ -61,6 +61,8 @@
SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
SDMMC_IDMAC_INT_TI)
#define DESC_RING_BUF_SZ PAGE_SIZE
struct idmac_desc_64addr {
u32 des0; /* Control Descriptor */
@ -474,7 +476,8 @@ static int dw_mci_idmac_init(struct dw_mci *host)
if (host->dma_64bit_address == 1) {
struct idmac_desc_64addr *p;
/* Number of descriptors in the ring buffer */
host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
host->ring_size =
DESC_RING_BUF_SZ / sizeof(struct idmac_desc_64addr);
/* Forward link the descriptor list */
for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
@ -500,7 +503,8 @@ static int dw_mci_idmac_init(struct dw_mci *host)
} else {
struct idmac_desc *p;
/* Number of descriptors in the ring buffer */
host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
host->ring_size =
DESC_RING_BUF_SZ / sizeof(struct idmac_desc);
/* Forward link the descriptor list */
for (i = 0, p = host->sg_cpu;
@ -609,7 +613,7 @@ static inline int dw_mci_prepare_desc64(struct dw_mci *host,
err_own_bit:
/* restore the descriptor chain as it's polluted */
dev_dbg(host->dev, "desciptor is still owned by IDMAC.\n");
memset(host->sg_cpu, 0, PAGE_SIZE);
memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
dw_mci_idmac_init(host);
return -EINVAL;
}
@ -685,7 +689,7 @@ static inline int dw_mci_prepare_desc32(struct dw_mci *host,
err_own_bit:
/* restore the descriptor chain as it's polluted */
dev_dbg(host->dev, "desciptor is still owned by IDMAC.\n");
memset(host->sg_cpu, 0, PAGE_SIZE);
memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
dw_mci_idmac_init(host);
return -EINVAL;
}
@ -2754,7 +2758,8 @@ static void dw_mci_init_dma(struct dw_mci *host)
}
/* Alloc memory for sg translation */
host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
host->sg_cpu = dmam_alloc_coherent(host->dev,
DESC_RING_BUF_SZ,
&host->sg_dma, GFP_KERNEL);
if (!host->sg_cpu) {
dev_err(host->dev,