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intel/common/smbus: increase spd read performance

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This change increases the spd read performance by using smbus word
access.

BUG=b:67021853
TEST=boot to os and find 80~100 ms boot time improvement on one dimm

Change-Id: I98fe67642d8ccd428bccbca7f6390331d6055d14
Signed-off-by: Kane Chen <kane.chen@intel.com>
Reviewed-on: https://review.coreboot.org/22072
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Kane Chen
2017-10-16 19:40:18 +08:00
committed by Aaron Durbin
parent dfd2a8b7e7
commit 66f1f382cd
6 changed files with 73 additions and 7 deletions
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src/include/device/early_smbus.h
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@@ -63,6 +63,7 @@ void smbus_reset(u32 smbus_dev);
int smbus_print_error(u32 smbus_dev, u8 host_status, int loops);
int smbus_is_busy(u32 smbus_dev);
int smbus_wait_until_ready(u32 smbus_dev);
u16 smbus_read_word(u32 smbus_dev, u8 addr, u8 offset);
u8 smbus_read_byte(u32 smbus_dev, u8 addr, u8 offset);
u8 smbus_write_byte(u32 smbus_dev, u8 addr, u8 offset, u8 value);
void smbus_delay(void);