From 1332bdc2df7f71727e3cb9ca3f45b27b9e7b5531 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marek.vasut+renesas@mailbox.org>
Date: Sun, 22 Oct 2023 23:40:43 +0200
Subject: [PATCH] mmc: tmio: Disable 1/1024 clock divider on Renesas R-Car
platforms
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+renesas@mailbox.org>
Acked-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Thuan Nguyen Hong <thuan.nguyen-hong@banvien.com.vn>
---
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 83eaf361f0..890c496b53 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",
--
2.39.5