Commit 3d50b95b authored Nov 14, 2022 by Corentin Labbe Committed by Wolfram Sang Dec 01, 2022

i2c: smbus: add DDR support for SPD



On my x05 laptop I got:
Memory type 0x12 not supported yet, not instantiating SPD

Adding the 0x12 case lead to a successful instantiated SPD AT24 EEPROM.
i801_smbus 0000:00:1f.3: SMBus using polling
i2c i2c-6: 2/2 memory slots populated (from DMI)
at24 6-0050: 256 byte spd EEPROM, read-only
i2c i2c-6: Successfully instantiated SPD at 0x50
at24 6-0051: 256 byte spd EEPROM, read-only

And then, I decoded it successfully via decode-dimms.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

parent e0c7800a

drivers/i2c/i2c-smbus.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -361,9 +361,15 @@ void i2c_register_spd(struct i2c_adapter *adap)
		return;
		}

		/*
		* Memory types could be found at section 7.18.2 (Memory Device — Type), table 78
		* https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
		*/
		switch (common_mem_type) {
		case 0x12: /* DDR */
		case 0x13: /* DDR2 */
		case 0x18: /* DDR3 */
		case 0x1B: /* LPDDR */
		case 0x1C: /* LPDDR2 */
		case 0x1D: /* LPDDR3 */
		name = "spd";