diff options
| author | Codrin Ciubotariu <codrin.ciubotariu@microchip.com> | 2020-02-25 17:50:09 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2020-05-05 16:37:21 +0200 |
| commit | 73371d5f313aa056a451f84b652623da6054f89b (patch) | |
| tree | 1052e339cc6101cf65a6ecc55823a160ad35cb3a /drivers/i2c/busses/i2c-at91-core.c | |
| parent | e896be5ad1017aa710f8b979036a43d3e5b2f38d (diff) | |
i2c: at91: Send bus clear command if SDA is down
After a transfer timeout, some faulty I2C slave devices might hold down
the SDA pin. We can generate a bus clear command, hoping that the slave
might release the pins.
If the CLEAR command is not supported, we will use gpio recovery, if
available, to reset the bus.
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-at91-core.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-at91-core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-at91-core.c b/drivers/i2c/busses/i2c-at91-core.c index 3da1a8acecb5..e14edd236108 100644 --- a/drivers/i2c/busses/i2c-at91-core.c +++ b/drivers/i2c/busses/i2c-at91-core.c @@ -131,6 +131,7 @@ static struct at91_twi_pdata sama5d2_config = { .has_dig_filtr = true, .has_adv_dig_filtr = true, .has_ana_filtr = true, + .has_clear_cmd = false, /* due to errata, CLEAR cmd is not working */ }; static struct at91_twi_pdata sam9x60_config = { @@ -142,6 +143,7 @@ static struct at91_twi_pdata sam9x60_config = { .has_dig_filtr = true, .has_adv_dig_filtr = true, .has_ana_filtr = true, + .has_clear_cmd = true, }; static const struct of_device_id atmel_twi_dt_ids[] = { |