tpm: tis_i2c: Limit read bursts to I2C_SMBUS_BLOCK_MAX (32) bytes
authorAlexander Sverdlin <alexander.sverdlin@siemens.com>
Wed, 24 May 2023 15:40:39 +0000 (17:40 +0200)
committerJarkko Sakkinen <jarkko@kernel.org>
Mon, 17 Jul 2023 19:32:30 +0000 (19:32 +0000)
commitf3b70b6e3390bfdf18fdd7d278a72a12784fdcce
treecec62f897cf2f32d8928759d2dbb442a71f9fd61
parentf0afba4042bd902d290405c0638bc1295872d8a7
tpm: tis_i2c: Limit read bursts to I2C_SMBUS_BLOCK_MAX (32) bytes

Underlying I2C bus drivers not always support longer transfers and
imx-lpi2c for instance doesn't. SLB 9673 offers 427-bytes packets.

Visible symptoms are:

tpm tpm0: Error left over data
tpm tpm0: tpm_transmit: tpm_recv: error -5
tpm_tis_i2c: probe of 1-002e failed with error -5

Cc: stable@vger.kernel.org # v5.20+
Fixes: bbc23a07b072 ("tpm: Add tpm_tis_i2c backend for tpm_tis_core")
Tested-by: Michael Haener <michael.haener@siemens.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
drivers/char/tpm/tpm_tis_i2c.c