Commit 9b0d6855 authored by Wolfram Sang's avatar Wolfram Sang Committed by Ulf Hansson
Browse files

mmc: renesas_sdhi: enforce manual correction for Gen3 



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: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20191217114034.13290-5-wsa+renesas@sang-engineering.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 71cfc927

drivers/mmc/host/renesas_sdhi_core.c

+6 −0
Original line number Diff line number Diff line
@@ -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) |

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