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pinctrl: sh-pfc: r8a7790: Initialize TDSEL register for ES1.0

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Documentation for ES1.0 says that some bits in TDSEL must be set (ch
5.3.39 in R-Car H2 v0.91). However, the reset value of the register is
0, so software has to do it. Add this to the kernel driver to ensure
this is really done independent of firmware versions and use
whitelisting for ES versions known to need this.

This is needed for some SD cards supporting SDR104 transfer mode. For
me, TDSEL was not initialized by the firmware and I had problems with
the card when re-inserting it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Wolfram Sang 2019-01-07 23:13:19 +01:00 committed by Geert Uytterhoeven
parent d2ccdc11fd
commit 95c2d0efa0
1 changed files with 17 additions and 0 deletions
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17
drivers/pinctrl/sh-pfc/pfc-r8a7790.c
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@ -10,7 +10,9 @@
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/sys_soc.h>
#include "core.h"
#include "sh_pfc.h"
/*
@ -5691,7 +5693,22 @@ static int r8a7790_pin_to_pocctrl(struct sh_pfc *pfc, unsigned int pin, u32 *poc
return 31 - (pin & 0x1f);
}
static const struct soc_device_attribute r8a7790_tdsel[] = {
{ .soc_id = "r8a7790", .revision = "ES1.0" },
{ /* sentinel */ }
};
static int r8a7790_pinmux_soc_init(struct sh_pfc *pfc)
{
/* Initialize TDSEL on old revisions */
if (soc_device_match(r8a7790_tdsel))
sh_pfc_write(pfc, 0xe6060088, 0x00155554);
return 0;
}
static const struct sh_pfc_soc_operations r8a7790_pinmux_ops = {
.init = r8a7790_pinmux_soc_init,
.pin_to_pocctrl = r8a7790_pin_to_pocctrl,
};