The R-Car Gen3 SD_CLK_CTRL register does not use BIT(16) to implement divider 1/1024, instead BIT(16) is reserved bit and divider 1/1024 is not supported. The divider 1/1024 is specific to Socionext variant of the IP, as is indicated by Linux commit:
0196c8db8363 ("mmc: tmio: move tmio_mmc_set_clock() to platform hook") " Socionext (and Panasonic) uses bit 10 (CLKSEL) for 1/1. Also, newer versions of UniPhier SoC variants use bit 16 for 1/1024. " Do not set the TMIO_SD_CAP_DIV1024 on Renesas R-Car platforms even if the IP VERSION register does exist, and indicates IP version is newer or equal to version 1.0 . The IP version 1.0 or newer does not imply presence of the 1/1024 divider. Since the TMIO driver is used exactly by two supported platforms, that is Renesas R-Car and Socionext UniPhier, it is OK to check whether the TMIO_SD_CAP_RCAR capability is not set to identify the UniPhier platform and add the capability only on that platform. Fixes: 58c35b17aa8f ("mmc: matsushita-common: Always check controller version") Signed-off-by: Marek Vasut <marek.vasut+rene...@mailbox.org> --- Cc: Jaehoon Chung <jh80.ch...@samsung.com> Cc: Nobuhiro Iwamatsu <iwama...@nigauri.org> Cc: Paul Barker <paul.barker...@bp.renesas.com> Cc: Peng Fan <peng....@nxp.com> --- drivers/mmc/tmio-common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c index 83eaf361f0c..890c496b535 100644 --- a/drivers/mmc/tmio-common.c +++ b/drivers/mmc/tmio-common.c @@ -759,7 +759,8 @@ int tmio_sd_probe(struct udevice *dev, u32 quirks) dev_dbg(dev, "version %x\n", priv->version); if (priv->version >= 0x10) { priv->caps |= TMIO_SD_CAP_DMA_INTERNAL; - priv->caps |= TMIO_SD_CAP_DIV1024; + if (!(priv->caps & TMIO_SD_CAP_RCAR)) + priv->caps |= TMIO_SD_CAP_DIV1024; } if (fdt_get_property(gd->fdt_blob, dev_of_offset(dev), "non-removable", -- 2.42.0