diff options
| author | Jocelyn Bohr <bohr@google.com> | 2017-04-02 01:24:33 -0700 |
|---|---|---|
| committer | Jaehoon Chung <jh80.chung@samsung.com> | 2017-04-14 15:23:03 +0900 |
| commit | 4db2b61fcf206cb45753cd1f988a9b0aad92b561 (patch) | |
| tree | c2133ee2a5c41d2bbc9ed9aa4305e4d0c8368473 | |
| parent | c86c0155dcfbb02ce92c4d7245ffdf6fa904fbee (diff) | |
mmc: bcm2835_sdhci: Speed up mmc writes.
The linux kernel driver for this module does not use a delay when
writing to the SDHCI_BUFFER register. This patch mimics that behavior
in order to speed up the mmc writes on the Raspberry Pi.
Signed-off-by: Alex Deymo <deymo@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | drivers/mmc/bcm2835_sdhci.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mmc/bcm2835_sdhci.c b/drivers/mmc/bcm2835_sdhci.c index 29c2a85812..20079bce48 100644 --- a/drivers/mmc/bcm2835_sdhci.c +++ b/drivers/mmc/bcm2835_sdhci.c @@ -44,6 +44,7 @@ /* 400KHz is max freq for card ID etc. Use that as min */ #define MIN_FREQ 400000 +#define SDHCI_BUFFER 0x20 struct bcm2835_sdhci_host { struct sdhci_host host; @@ -69,8 +70,11 @@ static inline void bcm2835_sdhci_raw_writel(struct sdhci_host *host, u32 val, * (Which is just as well - otherwise we'd have to nobble the DMA engine * too) */ - while (timer_get_us() - bcm_host->last_write < bcm_host->twoticks_delay) - ; + if (reg != SDHCI_BUFFER) { + while (timer_get_us() - bcm_host->last_write < + bcm_host->twoticks_delay) + ; + } writel(val, host->ioaddr + reg); bcm_host->last_write = timer_get_us(); |