i2c: i801: Fix block process call transactions

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[ Upstream commit c1c9d0f6f7 ]

According to the Intel datasheets, software must reset the block
buffer index twice for block process call transactions: once before
writing the outgoing data to the buffer, and once again before
reading the incoming data from the buffer.

The driver is currently missing the second reset, causing the wrong
portion of the block buffer to be read.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reported-by: Piotr Zakowski <piotr.zakowski@intel.com>
Closes: https://lore.kernel.org/linux-i2c/20240213120553.7b0ab120@endymion.delvare/
Fixes: 315cd67c94 ("i2c: i801: Add Block Write-Block Read Process Call support")
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Jean Delvare 2024-02-14 15:59:39 +01:00 • committed by Greg Kroah-Hartman

parent 0e01ccadfd

commit 491528935c

1 changed files with 2 additions and 2 deletions

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drivers/i2c/busses/i2c-i801.c

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