Hi Prashant and Gwendal,
On 19/9/20 1:38, Gwendal Grignou wrote:
> On Mon, Sep 14, 2020 at 4:29 PM Prashant Malani <[email protected]> wrote:
>>
>> Thanks Enric,
>>
>> On Mon, Sep 7, 2020 at 3:48 AM Enric Balletbo i Serra
>> <[email protected]> wrote:
>>>
>>> Hi Prashant,
>>>
>>> Thank you for your patch.
>>>
>>> On 3/9/20 11:54, Prashant Malani wrote:
>>>> Since all the other call-sites of cros_ec_cmd_xfer() have been converted
>>>> to use cros_ec_cmd_xfer_status() instead, update the remaining
>>>> call-sites to prepare for the merge of cros_ec_cmd_xfer() into
>>>> cros_ec_cmd_xfer_status().
>>>>
>>>> As part of this update, change the error handling inside
>>>> cros_ec_get_sensor_count() such that the legacy LPC interface is tried
>>>> on all error values, not just when msg->result != EC_RESULT_SUCCESS.
>>>>
>>>> Signed-off-by: Prashant Malani <[email protected]>
> Reviewed-by: Gwendal Grignou <[email protected]>
> Tested-by: Gwendal Grignou <[email protected]>
>
> There is a slight change in API in cros_ec_get_sensor_count(): it will
> return a negative number of sensors when there
> are no sensors on arm platform when MOTIONSENSE_CMD_DUMP is not
> supported (typical for sensorless chromebook) instead of 0.
> However, this is not a problem when probing the EC as we ignore errors
> only looking for cros_ec_get_sensor_count() returning a positive
> number of sensors.
>
I added this comment to the commit log and applied the patch for 5.10.
Thanks,
Enric
>>>
>>> Gwendal, I'd like to hear from you regarding this patch as you're the one
>>> that
>>> know most about the corner cases for the sensors in different hardware.
>>> Could
>>> you take a look and give us your Reviewed tag if all is good?
>>>
>> Gwendal, could you kindly take a look? Thanks!
>>
>>> Thanks,
>>>
>>> Enric
>>>
>>>> ---
>>>> drivers/platform/chrome/cros_ec_proto.c | 15 ++++-----------
>>>> 1 file changed, 4 insertions(+), 11 deletions(-)
>>>>
>>>> diff --git a/drivers/platform/chrome/cros_ec_proto.c
>>>> b/drivers/platform/chrome/cros_ec_proto.c
>>>> index dda182132a6a..2cb1defcdd13 100644
>>>> --- a/drivers/platform/chrome/cros_ec_proto.c
>>>> +++ b/drivers/platform/chrome/cros_ec_proto.c
>>>> @@ -650,7 +650,7 @@ static int get_next_event_xfer(struct cros_ec_device
>>>> *ec_dev,
>>>> msg->insize = size;
>>>> msg->outsize = 0;
>>>>
>>>> - ret = cros_ec_cmd_xfer(ec_dev, msg);
>>>> + ret = cros_ec_cmd_xfer_status(ec_dev, msg);
>>>> if (ret > 0) {
>>>> ec_dev->event_size = ret - 1;
>>>> ec_dev->event_data = *event;
>>>> @@ -694,7 +694,7 @@ static int get_keyboard_state_event(struct
>>>> cros_ec_device *ec_dev)
>>>> msg->insize = sizeof(ec_dev->event_data.data);
>>>> msg->outsize = 0;
>>>>
>>>> - ec_dev->event_size = cros_ec_cmd_xfer(ec_dev, msg);
>>>> + ec_dev->event_size = cros_ec_cmd_xfer_status(ec_dev, msg);
>>>> ec_dev->event_data.event_type = EC_MKBP_EVENT_KEY_MATRIX;
>>>> memcpy(&ec_dev->event_data.data, msg->data,
>>>> sizeof(ec_dev->event_data.data));
>>>> @@ -883,11 +883,9 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
>>>> params = (struct ec_params_motion_sense *)msg->data;
>>>> params->cmd = MOTIONSENSE_CMD_DUMP;
>>>>
>>>> - ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
>>>> + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
>>>> if (ret < 0) {
>>>> sensor_count = ret;
>>>> - } else if (msg->result != EC_RES_SUCCESS) {
>>>> - sensor_count = -EPROTO;
>>>> } else {
>>>> resp = (struct ec_response_motion_sense *)msg->data;
>>>> sensor_count = resp->dump.sensor_count;
>>>> @@ -898,9 +896,7 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
>>>> * Check legacy mode: Let's find out if sensors are accessible
>>>> * via LPC interface.
>>>> */
>>>> - if (sensor_count == -EPROTO &&
>>>> - ec->cmd_offset == 0 &&
>>>> - ec_dev->cmd_readmem) {
>>>> + if (sensor_count < 0 && ec->cmd_offset == 0 && ec_dev->cmd_readmem) {
>>>> ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS,
>>>> 1, &status);
>>>> if (ret >= 0 &&
>>>> @@ -915,9 +911,6 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
>>>> */
>>>> sensor_count = 0;
>>>> }
>>>> - } else if (sensor_count == -EPROTO) {
>>>> - /* EC responded, but does not understand DUMP command. */
>>>> - sensor_count = 0;
>>>> }
>>>> return sensor_count;
>>>> }
>>>>
