diff options
| author | Vasily Khoruzhick <anarsoul@gmail.com> | 2023-03-10 04:03:49 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-03-23 13:30:20 +0300 |
| commit | 49502408007b77ff290ce62e6218cefaeedcb31a (patch) | |
| tree | db4078dcd7247be2aa0a15748a23923fa07502f2 /drivers/mmc | |
| parent | 07248afa83b0b31d7906201cf0348800d0552d99 (diff) | |
| download | linux-49502408007b77ff290ce62e6218cefaeedcb31a.tar.xz | |
mmc: sdhci-of-dwcmshc: properly determine max clock on Rockchip
Currently .get_max_clock returns the current clock rate for cclk_emmc
on rk35xx, thus max clock gets set to whatever bootloader set it to.
In case of u-boot, it is intentionally reset to 50 MHz if it boots
from eMMC, see mmc_deinit() in u-boot sources. As a result, HS200 and
HS400 modes are never selected by Linux, because dwcmshc_rk35xx_postinit
clears appropriate caps if host->mmc->f_max is < 52MHz
cclk_emmc is not a fixed clock on rk35xx, so using
sdhci_pltfm_clk_get_max_clock is not appropriate here.
Implement rk35xx_get_max_clock that returns actual max clock for cclk_emmc.
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230310010349.509132-1-anarsoul@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-of-dwcmshc.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index d1490469184b..e68cd87998c8 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -126,6 +126,13 @@ static unsigned int dwcmshc_get_max_clock(struct sdhci_host *host) return pltfm_host->clock; } +static unsigned int rk35xx_get_max_clock(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return clk_round_rate(pltfm_host->clk, ULONG_MAX); +} + static void dwcmshc_check_auto_cmd23(struct mmc_host *mmc, struct mmc_request *mrq) { @@ -343,7 +350,7 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = { .set_clock = dwcmshc_rk3568_set_clock, .set_bus_width = sdhci_set_bus_width, .set_uhs_signaling = dwcmshc_set_uhs_signaling, - .get_max_clock = sdhci_pltfm_clk_get_max_clock, + .get_max_clock = rk35xx_get_max_clock, .reset = rk35xx_sdhci_reset, .adma_write_desc = dwcmshc_adma_write_desc, }; |