diff options
| author | Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com> | 2011-11-21 16:42:20 +0100 |
|---|---|---|
| committer | Philippe Langlais <philippe.langlais@stericsson.com> | 2012-05-22 11:02:59 +0200 |
| commit | 339efff8f0dd0bb236b26c80963de7a1f64c8a1e (patch) | |
| tree | 42dee66e2c1bb953b2ae3e6d099440bcba3608c7 | |
| parent | 7831c0b624cf6dcb4d860dd2452faed6c32e42d2 (diff) | |
mmc: mmci: Use HWFC when possible
HW flow control should not be used for write transfers less then
8 bytes. All other transfers should use HW flow control.
ST-Ericsson Linux next: NA
ST-Ericsson ID: 398871
ST-Ericsson FOSS-OUT ID: Trivial
Change-Id: I51044d26cfc7df033852becbbc6e796396dfb45f
Signed-off-by: Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com>
Signed-off-by: Fredrik Soderstedt <fredrik.soderstedt@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/40191
Reviewed-by: QATOOLS
Reviewed-by: QABUILD
Reviewed-by: Ulf HANSSON <ulf.hansson@stericsson.com>
| -rw-r--r-- | drivers/mmc/host/mmci.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 6e03104b7a2..eaeae3232db 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -696,14 +696,11 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data) datactrl |= MCI_ST_DPSM_SDIOEN; /* - * The ST Micro variant for SDIO transfer sizes - * less then or equal to 8 bytes needs to have clock - * H/W flow control disabled. Since flow control is - * not really needed for anything that fits in the - * FIFO, we can disable it for any write smaller - * than the FIFO size. + * The ST Micro variant for SDIO write transfer sizes + * less then 8 bytes needs to have clock H/W flow + * control disabled. */ - if ((host->size <= variant->fifosize) && + if ((host->size < 8) && (data->flags & MMC_DATA_WRITE)) clk = host->clk_reg & ~variant->clkreg_enable; else |