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| author | Sebastian Reichel <sre@kernel.org> | 2025-11-19 03:41:41 +0300 |
|---|---|---|
| committer | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2025-11-21 20:05:27 +0300 |
| commit | 752630cb8c62abca0407f96cc7baa2e13335cd15 (patch) | |
| tree | afa0ce373652e7a13e6a33f91562c7e76bef26ec | |
| parent | 29be646f75c4406bdd8322572a6054ebd22bf63b (diff) | |
| download | linux-752630cb8c62abca0407f96cc7baa2e13335cd15.tar.xz | |
platform: arm64: thinkpad-t14s-ec: sleep after EC access
The ACPI ECRD and ECWR functions have a 10ms sleep at the end. It turns
out, that this is sometimes needed to avoid I2C transmission failures,
especially for functions doing regmap_update_bits (and thus read + write
shortly after each other). This fixes problems like the following
appearing in the kernel log:
leds platform::micmute: Setting an LED's brightness failed (-6)
leds platform::kbd_backlight: Setting an LED's brightness failed (-6)
The ACPI QEVT function used to read the interrupt status register also
has a 10ms sleep at the end. Without that there are problems with
reading multiple events following directly after each other resulting
in the following error message being logged:
thinkpad-t14s-ec 4-0028: Failed to read event
Fixes: 60b7ab6ce030 ("platform: arm64: thinkpad-t14s-ec: new driver")
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Link: https://patch.msgid.link/20251119-thinkpad-t14s-ec-improvements-v2-2-441219857c02@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
| -rw-r--r-- | drivers/platform/arm64/lenovo-thinkpad-t14s.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/platform/arm64/lenovo-thinkpad-t14s.c b/drivers/platform/arm64/lenovo-thinkpad-t14s.c index c1c01b977f2b..cf6a1d3b2617 100644 --- a/drivers/platform/arm64/lenovo-thinkpad-t14s.c +++ b/drivers/platform/arm64/lenovo-thinkpad-t14s.c @@ -120,6 +120,7 @@ static int t14s_ec_write(void *context, unsigned int reg, if (ret < 0) return ret; + fsleep(10000); return 0; } @@ -157,6 +158,7 @@ static int t14s_ec_read(void *context, unsigned int reg, out: i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT); + fsleep(10000); return ret; } @@ -191,6 +193,8 @@ static int t14s_ec_read_evt(struct t14s_ec *ec, u8 *val) if (ret < 0) goto out; + fsleep(10000); + ret = 0; out: |