samsung_sm8750/android_kernel_samsung_sm8750
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i2c: npcm: Add clock toggle recovery

Browse Source 
[ Upstream commit 38010591a0fc3203f1cee45b01ab358b72dd9ab2 ]

During init of the bus, the module checks that the bus is idle.
If one of the lines are stuck try to recover them first before failing.
Sometimes SDA and SCL are low if improper reset occurs (e.g., reboot).

Signed-off-by: Tali Perry <tali.perry1@gmail.com>
Signed-off-by: Mohammed Elbadry <mohammed.0.elbadry@gmail.com>
Reviewed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>
Link: https://lore.kernel.org/r/20250328193252.1570811-1-mohammed.0.elbadry@gmail.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tali Perry
2025-03-28 19:32:50 +00:00
committed by Greg Kroah-Hartman
parent be5f6a6550
commit 04fa1bef29
1 changed files with 8 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/i2c/busses/i2c-npcm7xx.c
View File

@@ -1971,10 +1971,14 @@ static int npcm_i2c_init_module(struct npcm_i2c *bus, enum i2c_mode mode,
/* Check HW is OK: SDA and SCL should be high at this point. */
if ((npcm_i2c_get_SDA(&bus->adap) == 0) || (npcm_i2c_get_SCL(&bus->adap) == 0)) {
dev_err(bus->dev, "I2C%d init fail: lines are low\n", bus->num);
dev_err(bus->dev, "SDA=%d SCL=%d\n", npcm_i2c_get_SDA(&bus->adap),
npcm_i2c_get_SCL(&bus->adap));
return -ENXIO;
dev_warn(bus->dev, " I2C%d SDA=%d SCL=%d, attempting to recover\n", bus->num,
npcm_i2c_get_SDA(&bus->adap), npcm_i2c_get_SCL(&bus->adap));
if (npcm_i2c_recovery_tgclk(&bus->adap)) {
dev_err(bus->dev, "I2C%d init fail: SDA=%d SCL=%d\n",
bus->num, npcm_i2c_get_SDA(&bus->adap),
npcm_i2c_get_SCL(&bus->adap));
return -ENXIO;
}
}
npcm_i2c_int_enable(bus, true);