diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2020-11-06 10:25:48 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2020-11-10 15:58:01 +0300 |
| commit | 24ce2d7b8beaede6a467640bfa7636e73d9b491e (patch) | |
| tree | a9c5844fc22ca58896c7798566e8c055630eaacb /drivers/mmc/host | |
| parent | 1023e290ba567af0640f9a5bd878207a5dff6ed2 (diff) | |
| download | linux-24ce2d7b8beaede6a467640bfa7636e73d9b491e.tar.xz | |
mmc: tmio: bring tuning HW to a sane state with MMC_POWER_OFF
When powering off a card, we need to disable the tuning HW (like SCC for
the Renesas SDHI) to get to a sane state and allow for re-tuning new
cards. This was hidden before because we wrongly did that in hw_reset()
before which was an unintended use of hw_reset(). Now that we corrected
the use of hw_reset() meanwhile, we revealed this shortcoming and need
to fix it properly by explicitly calling the downgrade callback.
Fixes: 6e7d4de10890 ("mmc: renesas_sdhi: move wrong 'hw_reset' to 'reset'")
Suggested-by: Takeshi Saito <takeshi.saito.xv@renesas.com>
Reviewed-by: Takeshi Saito <takeshi.saito.xv@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20201106072549.1495-3-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c index cfb53d7c63d7..cb4149fd12e0 100644 --- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -927,6 +927,9 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) switch (ios->power_mode) { case MMC_POWER_OFF: tmio_mmc_power_off(host); + /* Downgrade ensures a sane state for tuning HW (e.g. SCC) */ + if (host->mmc->ops->hs400_downgrade) + host->mmc->ops->hs400_downgrade(host->mmc); host->set_clock(host, 0); break; case MMC_POWER_UP: |