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mips: mt7620: fallback to SDRAM when syscfg0 does not have a valid value for the memory type

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Mediatek MT7620 SoC has syscfg0 bits where it sets the type of memory being used.
However, sometimes those bits are not set properly (reading "11"). In this case, the SoC assumes SDRAM.
The patch below reflects that.

Signed-off-by: Sashka Nochkin <linux-mips@durdom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13135/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Sashka Nochkin 2016-04-19 23:44:45 -04:00 • committed by Ralf Baechle
parent 6533af4d48
commit 86ce9a340e
2 changed files with 6 additions and 2 deletions
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1
arch/mips/include/asm/mach-ralink/mt7620.h
View file

@ -72,6 +72,7 @@
#define SYSCFG0_DRAM_TYPE_SDRAM 0
#define SYSCFG0_DRAM_TYPE_DDR1 1
#define SYSCFG0_DRAM_TYPE_DDR2 2
#define SYSCFG0_DRAM_TYPE_UNKNOWN 3
#define SYSCFG0_DRAM_TYPE_DDR2_MT7628 0
#define SYSCFG0_DRAM_TYPE_DDR1_MT7628 1

7
arch/mips/ralink/mt7620.c
View file

@ -581,11 +581,14 @@ void prom_soc_init(struct ralink_soc_info *soc_info)
(rev & CHIP_REV_ECO_MASK));
cfg0 = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG0);
if (is_mt76x8())
if (is_mt76x8()) {
dram_type = cfg0 & DRAM_TYPE_MT7628_MASK;
else
} else {
dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) &
SYSCFG0_DRAM_TYPE_MASK;
if (dram_type == SYSCFG0_DRAM_TYPE_UNKNOWN)
dram_type = SYSCFG0_DRAM_TYPE_SDRAM;
}
soc_info->mem_base = MT7620_DRAM_BASE;
if (is_mt76x8())