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omap: emif: deal with rams that return duplicate mr data on all byte lanes

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Some rams (Micron for example) return duplicate mr data on all byte lanes.

Users of the get_mr function currently don't deal with this duplicated
data gracefully.  This patch detects the duplicated data and returns only
the expected 8 bit mr data.

Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Steve Sakoman 2012-05-30 07:38:07 +00:00 committed by Albert ARIBAUD
parent 38f25b125e
commit 55c1284942
1 changed files with 6 additions and 1 deletions
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7
arch/arm/cpu/armv7/omap-common/emif-common.c
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@ -77,7 +77,12 @@ static inline u32 get_mr(u32 base, u32 cs, u32 mr_addr)
mr = readl(&emif->emif_lpddr2_mode_reg_data);
debug("get_mr: EMIF%d cs %d mr %08x val 0x%x\n", emif_num(base),
cs, mr_addr, mr);
return mr;
if (((mr & 0x0000ff00) >> 8) == (mr & 0xff) &&
((mr & 0x00ff0000) >> 16) == (mr & 0xff) &&
((mr & 0xff000000) >> 24) == (mr & 0xff))
return mr & 0xff;
else
return mr;
}
static inline void set_mr(u32 base, u32 cs, u32 mr_addr, u32 mr_val)