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mmc: sdhci: add adma_table_cnt member to struct sdhci_host

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This patch adds adma_table_cnt member to struct sdhci_host to give more
flexibility to drivers to control the ADMA table count.

Default value of adma_table_cnt is set to (SDHCI_MAX_SEGS * 2 + 1).

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jisheng Zhang 2018-08-28 17:46:35 +08:00 committed by Ulf Hansson
parent 1ff537bd5d
commit e93be38af1
2 changed files with 12 additions and 8 deletions
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17
drivers/mmc/host/sdhci.c
View File

@ -3324,6 +3324,13 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
/*
* The DMA table descriptor count is calculated as the maximum
* number of segments times 2, to allow for an alignment
* descriptor for each segment, plus 1 for a nop end descriptor.
*/
host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
return host;
}
@ -3569,18 +3576,12 @@ int sdhci_setup_host(struct sdhci_host *host)
dma_addr_t dma;
void *buf;
/*
* The DMA descriptor table size is calculated as the maximum
* number of segments times 2, to allow for an alignment
* descriptor for each segment, plus 1 for a nop end descriptor,
* all multipled by the descriptor size.
*/
if (host->flags & SDHCI_USE_64_BIT_DMA) {
host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
host->adma_table_sz = host->adma_table_cnt *
SDHCI_ADMA2_64_DESC_SZ;
host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
} else {
host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
host->adma_table_sz = host->adma_table_cnt *
SDHCI_ADMA2_32_DESC_SZ;
host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
}

3
drivers/mmc/host/sdhci.h
View File

@ -564,6 +564,9 @@ struct sdhci_host {
/* Host SDMA buffer boundary. */
u32 sdma_boundary;
/* Host ADMA table count */
u32 adma_table_cnt;
u64 data_timeout;
unsigned long private[0] ____cacheline_aligned;