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mmc: renesas_sdhi: enforce manual correction for Gen3

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HW engineers say that automatic tap correction cannot be used for HS400
in all R-Car Gen3 SoCs. So, check for that SDHI variant and disable it
when HS400 is about to be enabled.

Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20191217114034.13290-5-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2019-12-17 12:40:33 +01:00 committed by Ulf Hansson
parent 71cfc92751
commit 9b0d6855e7
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/host/renesas_sdhi_core.c
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@ -348,6 +348,12 @@ static void renesas_sdhi_hs400_complete(struct tmio_mmc_host *host)
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF,
priv->scc_tappos_hs400);
/* Gen3 can't do automatic tap correction with HS400, so disable it */
if (sd_ctrl_read16(host, CTL_VERSION) == SDHI_VER_GEN3_SDMMC)
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) |