mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-14 12:37:32 +00:00
mmc: renesas_sdhi: Fix sampling clock position selecting
When tuning each tap is issued CMD19 twice and the result of both runs recorded in host->taps. If the result is different between the two runs the wrong sampling clock position was selected. Fix this by merging the two runs and only keep the result for each tap if it was good in both sets. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
parent
a8f399f624
commit
5c99826b27
1 changed files with 12 additions and 0 deletions
|
@ -384,6 +384,18 @@ static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
|
|||
/* Clear SCC_RVSREQ */
|
||||
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
|
||||
|
||||
/*
|
||||
* When tuning CMD19 is issued twice for each tap, merge the
|
||||
* result requiring the tap to be good in both runs before
|
||||
* considering it for tuning selection.
|
||||
*/
|
||||
for (i = 0; i < host->tap_num * 2; i++) {
|
||||
int offset = host->tap_num * (i < host->tap_num ? 1 : -1);
|
||||
|
||||
if (!test_bit(i, host->taps))
|
||||
clear_bit(i + offset, host->taps);
|
||||
}
|
||||
|
||||
/*
|
||||
* Find the longest consecutive run of successful probes. If that
|
||||
* is more than SH_MOBILE_SDHI_MAX_TAP probes long then use the
|
||||
|
|
Loading…
Reference in a new issue