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mmc: renesas_sdhi: clarify handling of selecting TAPs

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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;