Commit 2485f8cf authored by Andrey Grodzovsky's avatar Andrey Grodzovsky Committed by Alex Deucher
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drm/amdgpu: Remember to wait 10ms for write buffer flush v2 



EEPROM spec requests this.

v2: Only to be done for write data transactions.

Signed-off-by: default avatarAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: default avatarLuben Tuikov <luben.tuikov@amd.com>
parent b36d8d6b

drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c

+15 −0
Original line number Diff line number Diff line
@@ -55,6 +55,21 @@ int amdgpu_eeprom_xfer(struct i2c_adapter *i2c_adap, 
		r = i2c_transfer(i2c_adap, msgs, ARRAY_SIZE(msgs));

		if (r <= 0)

			return r;



		/* Only for write data */

		if (!msgs[1].flags)

			/*

			 * According to EEPROM spec there is a MAX of 10 ms required for

			 * EEPROM to flush internal RX buffer after STOP was issued at the

			 * end of write transaction. During this time the EEPROM will not be

			 * responsive to any more commands - so wait a bit more.

			 *

			 * TODO Improve to wait for first ACK for slave address after

			 * internal write cycle done.

			 */

			msleep(10);





		bytes_transferred = r - EEPROM_OFFSET_LENGTH;

		eeprom_addr += bytes_transferred;

		msgs[0].buf[0] = ((eeprom_addr >> 8) & 0xff);