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63d4c081 |
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06-Apr-2021 |
Luben Tuikov <luben.tuikov@amd.com> |
drm/amdgpu: Optimize EEPROM RAS table I/O
Split functionality between read and write, which
simplifies the code and exposes areas of
optimization and more or less complexity, and take
advantage of that.
Read and write the table in one go; use a separate
stage to decode or encode the data, as opposed to
on the fly, which keeps the I2C bus busy. Use a
single read/write to read/write the table or at
most two if the number of records we're
reading/writing wraps around.
Check the check-sum of a table in EEPROM on init.
Update the checksum at the same time as when
updating the table header signature, when the
threshold was increased on boot.
Take advantage of arithmetic modulo 256, that is,
use a byte!, to greatly simplify checksum
arithmetic.
Cc: Alexander Deucher <Alexander.Deucher@amd.com>
Cc: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Acked-by: Alexander Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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| #
025a64a5 |
|
01-Feb-2021 |
Luben Tuikov <luben.tuikov@amd.com> |
drm/amdgpu: I2C EEPROM full memory addressing
* "eeprom_addr" is now 32-bit wide.
* Remove "slave_addr" from the I2C EEPROM driver
interface. The I2C EEPROM Device Type Identifier
is fixed at 1010b, and the rest of the bits
of the Device Address Byte/Device Select Code,
are memory address bits, where the first three
of those bits are the hardware selection bits.
All this is now a 19-bit address and passed
as "eeprom_addr". This abstracts the I2C bus
for EEPROM devices for this I2C EEPROM driver.
Now clients only pass the 19-bit EEPROM memory
address, to the I2C EEPROM driver, as the 32-bit
"eeprom_addr", from which they want to read from
or write to.
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Alexander Deucher <Alexander.Deucher@amd.com>
Cc: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Cc: Lijo Lazar <Lijo.Lazar@amd.com>
Cc: Stanley Yang <Stanley.Yang@amd.com>
Cc: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Acked-by: Alexander Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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