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mmc: matsushita-common: Special case only select registers in 16bit

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There are only a few registerse used in the 16bit mode which are
32bit internally. Special-case only those in the IO accessors and
always write both halves. Any other register access is protected
from accidentally overwriting neighboring register.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Marek Vasut 2018-04-09 20:47:31 +02:00
parent 8af6737d45
commit 01c0151a36
1 changed files with 3 additions and 1 deletions
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4
drivers/mmc/matsushita-common.c
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@ -68,7 +68,9 @@ void matsu_sd_writel(struct matsu_sd_priv *priv,
writel(val, priv->regbase + (reg << 1));
if (priv->caps & MATSU_SD_CAP_16BIT) {
writew(val & 0xffff, priv->regbase + (reg >> 1));
if (val >> 16)
if (reg == MATSU_SD_INFO1 || reg == MATSU_SD_INFO1_MASK ||
reg == MATSU_SD_INFO2 || reg == MATSU_SD_INFO2_MASK ||
reg == MATSU_SD_ARG)
writew(val >> 16, priv->regbase + (reg >> 1) + 2);
} else
writel(val, priv->regbase + reg);