This is a note to let you know that I've just added the patch titled iio: cros_ec: Use default frequencies when EC returns invalid information to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iio-cros_ec-use-default-frequencies-when-ec-returns-invalid-information.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 56e4f2dda23c6d39d327944faa89efaa4eb290d1 Mon Sep 17 00:00:00 2001 From: Gwendal Grignou <gwendal@xxxxxxxxxxxx> Date: Tue, 30 Jun 2020 08:37:30 -0700 Subject: iio: cros_ec: Use default frequencies when EC returns invalid information From: Gwendal Grignou <gwendal@xxxxxxxxxxxx> commit 56e4f2dda23c6d39d327944faa89efaa4eb290d1 upstream. Minimal and maximal frequencies supported by a sensor is queried. On some older machines, these frequencies are not returned properly and the EC returns 0 instead. When returned maximal frequency is 0, ignore the information and use default frequencies instead. Fixes: ae7b02ad2f32 ("iio: common: cros_ec_sensors: Expose cros_ec_sensors frequency range via iio sysfs") Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200630153730.3302889-1-gwendal@xxxxxxxxxxxx CC: <Stable@xxxxxxxxxxxxxxx> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c | 16 +++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c @@ -255,7 +255,7 @@ int cros_ec_sensors_core_init(struct pla struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent); struct cros_ec_dev *ec = sensor_hub->ec; struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev); - u32 ver_mask; + u32 ver_mask, temp; int frequencies[ARRAY_SIZE(state->frequencies) / 2] = { 0 }; int ret, i; @@ -310,10 +310,16 @@ int cros_ec_sensors_core_init(struct pla &frequencies[2], &state->fifo_max_event_count); } else { - frequencies[1] = state->resp->info_3.min_frequency; - frequencies[2] = state->resp->info_3.max_frequency; - state->fifo_max_event_count = - state->resp->info_3.fifo_max_event_count; + if (state->resp->info_3.max_frequency == 0) { + get_default_min_max_freq(state->resp->info.type, + &frequencies[1], + &frequencies[2], + &temp); + } else { + frequencies[1] = state->resp->info_3.min_frequency; + frequencies[2] = state->resp->info_3.max_frequency; + } + state->fifo_max_event_count = state->resp->info_3.fifo_max_event_count; } for (i = 0; i < ARRAY_SIZE(frequencies); i++) { state->frequencies[2 * i] = frequencies[i] / 1000; Patches currently in stable-queue which might be from gwendal@xxxxxxxxxxxx are queue-5.9/iio-cros_ec-use-default-frequencies-when-ec-returns-invalid-information.patch