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mmc: renesas_sdhi: clarify handling of selecting TAPs 

The comment and the define about how TAPs are selected were confusing to
me because the good TAP was only valid if it was bigger than a *_MAX_*
value. Rename the define and adapt the comment to what really happens.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20200408094638.10375-3-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2020-04-08 11:46:37 +02:00 committed by Ulf Hansson
parent 92fa2a567d
commit ec4fc1acf3
1 changed files with 5 additions and 5 deletions
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10
drivers/mmc/host/renesas_sdhi_core.c
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@ -422,7 +422,7 @@ static int renesas_sdhi_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_io
return 0;
}
#define SH_MOBILE_SDHI_MAX_TAP 3
#define SH_MOBILE_SDHI_MIN_TAP_ROW 3
static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
{
@ -446,9 +446,9 @@ static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
}
/*
* Find the longest consecutive run of successful probes. If that
* is more than SH_MOBILE_SDHI_MAX_TAP probes long then use the
* center index as the tap.
* Find the longest consecutive run of successful probes. If that
* is at least SH_MOBILE_SDHI_MIN_TAP_ROW probes long then use the
* center index as the tap, otherwise bail out.
*/
bitmap_for_each_set_region(priv->taps, rs, re, 0, taps_size) {
if (re - rs > tap_cnt) {
@ -458,7 +458,7 @@ static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
}
}
if (tap_cnt >= SH_MOBILE_SDHI_MAX_TAP)
if (tap_cnt >= SH_MOBILE_SDHI_MIN_TAP_ROW)
priv->tap_set = (tap_start + tap_end) / 2 % priv->tap_num;
else
return -EIO;