evie/android_kernel_oneplus_msm8998
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mmc: sdhci: add support for configurable request size

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Some platform drivers support more than 128 adma descriptors
and allows more than 512KB maximum request size per transfer.
Add a callback to get maximum supported adma descriptors from
platform driver instead of limiting host capabilities to
128 descriptors.

Change-Id: I0ac0ffbd0e792a76931e21b321b39c35195ac8d6
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
[subhashj@codeaurora.org: fixed minor merge conflict]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
This commit is contained in:
Asutosh Das 2013-01-10 21:05:49 +05:30 • committed by Subhash Jadavani
parent 6d26067be7
commit a45d072d68
2 changed files with 6 additions and 1 deletions
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2
drivers/mmc/host/sdhci.c
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@ -819,7 +819,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
return;
/* Sanity checks */
BUG_ON(data->blksz * data->blocks > 524288);
BUG_ON(data->blksz * data->blocks > host->mmc->max_req_size);
BUG_ON(data->blksz > host->mmc->max_blk_size);
BUG_ON(data->blocks > 65535);

5
drivers/mmc/host/sdhci.h
View file

@ -550,6 +550,10 @@ struct sdhci_host {
size_t adma_table_sz; /* ADMA descriptor table size */
size_t align_buffer_sz; /* Bounce buffer size */
unsigned int adma_desc_sz; /* ADMA descriptor table size */
unsigned int align_buf_sz; /* Bounce buffer size */
unsigned int adma_max_desc; /* Max ADMA descriptos (max sg segments) */
dma_addr_t adma_addr; /* Mapped ADMA descr. table */
dma_addr_t align_addr; /* Mapped bounce buffer */
@ -624,6 +628,7 @@ struct sdhci_ops {
void (*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);
void (*hw_reset)(struct sdhci_host *host);
void (*adma_workaround)(struct sdhci_host *host, u32 intmask);
unsigned int (*get_max_segments)(void);
void (*platform_init)(struct sdhci_host *host);
#define REQ_BUS_OFF (1 << 0)
#define REQ_BUS_ON (1 << 1)