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device/dram: Add method for converting MHz to MT/s

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Add method for converting DDR4 speed in MHz to MT/s. Checks that MHz is
within a speed grade range.

BUG=b:167155849
TEST=ddr4-test unit test
BRANCH=Zork

Change-Id: I1433f028afb794fe3e397b03f5bd0565494c8130
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45343
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Rob Barnes 2020-09-14 07:46:19 -06:00 • committed by Aaron Durbin
commit a01ee36288
5 changed files with 131 additions and 0 deletions
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5
src/include/device/dram/ddr4.h
View file

@ -69,4 +69,9 @@ enum cb_err spd_add_smbios17_ddr4(const u8 channel, const u8 slot,
const u16 selected_freq,
const dimm_attr *info);
/**
* Converts DDR4 clock speed in MHz to the standard reported speed in MT/s
*/
uint16_t ddr4_speed_mhz_to_reported_mts(uint16_t speed_mhz);
#endif /* DEVICE_DRAM_DDR4L_H */