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SubjectRe: [PATCH v7 3/6] mfd: cros-ec: Increase maximum mkbp event size
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Hi Lee,

On 03/07/2018 11:43, Lee Jones wrote:
> On Mon, 18 Jun 2018, Neil Armstrong wrote:
>
>> Hi Lee,
>>
>> On 18/06/2018 09:44, Lee Jones wrote:
>>> On Fri, 01 Jun 2018, Neil Armstrong wrote:
>>>
>>>> Having a 16 byte mkbp event size makes it possible to send CEC
>>>> messages from the EC to the AP directly inside the mkbp event
>>>> instead of first doing a notification and then a read.
>>>>
>>>> Signed-off-by: Stefan Adolfsson <sadolfsson@chromium.org>
>>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>>>> Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
>>>> ---
>>>> drivers/platform/chrome/cros_ec_proto.c | 40 +++++++++++++++++++++++++--------
>>>> include/linux/mfd/cros_ec.h | 2 +-
>>>> include/linux/mfd/cros_ec_commands.h | 19 ++++++++++++++++
>>>> 3 files changed, 51 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
>>>> index e7bbdf9..c4f6c44 100644
>>>> --- a/drivers/platform/chrome/cros_ec_proto.c
>>>> +++ b/drivers/platform/chrome/cros_ec_proto.c
>>>> @@ -504,10 +504,31 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
>>>> }
>>>> EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
>>>>
>>>> +static int get_next_event_xfer(struct cros_ec_device *ec_dev,
>>>> + struct cros_ec_command *msg,
>>>> + int version, uint32_t size)
>>>> +{
>>>> + int ret;
>>>> +
>>>> + msg->version = version;
>>>> + msg->command = EC_CMD_GET_NEXT_EVENT;
>>>> + msg->insize = size;
>>>> + msg->outsize = 0;
>>>> +
>>>> + ret = cros_ec_cmd_xfer(ec_dev, msg);
>>>> + if (ret > 0) {
>>>> + ec_dev->event_size = ret - 1;
>>>> + memcpy(&ec_dev->event_data, msg->data, ec_dev->event_size);
>>>> + }
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> static int get_next_event(struct cros_ec_device *ec_dev)
>>>> {
>>>> u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)];
>>>> struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
>>>> + static int cmd_version = 1;
>>>> int ret;
>>>>
>>>> if (ec_dev->suspended) {
>>>> @@ -515,18 +536,19 @@ static int get_next_event(struct cros_ec_device *ec_dev)
>>>> return -EHOSTDOWN;
>>>> }
>>>>
>>>> - msg->version = 0;
>>>> - msg->command = EC_CMD_GET_NEXT_EVENT;
>>>> - msg->insize = sizeof(ec_dev->event_data);
>>>> - msg->outsize = 0;
>>>> + if (cmd_version == 1) {
>>>> + ret = get_next_event_xfer(ec_dev, msg, cmd_version,
>>>> + sizeof(struct ec_response_get_next_event_v1));
>>>> + if (ret < 0 || msg->result != EC_RES_INVALID_VERSION)
>>>> + return ret;
>>>>
>>>> - ret = cros_ec_cmd_xfer(ec_dev, msg);
>>>> - if (ret > 0) {
>>>> - ec_dev->event_size = ret - 1;
>>>> - memcpy(&ec_dev->event_data, msg->data,
>>>> - sizeof(ec_dev->event_data));
>>>> + /* Fallback to version 0 for future send attempts */
>>>> + cmd_version = 0;
>>>> }
>>>>
>>>> + ret = get_next_event_xfer(ec_dev, msg, cmd_version,
>>>> + sizeof(struct ec_response_get_next_event));
>>>> +
>>>> return ret;
>>>> }
>>>>
>>>> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
>>>> index f36125e..32caef3 100644
>>>> --- a/include/linux/mfd/cros_ec.h
>>>> +++ b/include/linux/mfd/cros_ec.h
>>>> @@ -147,7 +147,7 @@ struct cros_ec_device {
>>>> bool mkbp_event_supported;
>>>> struct blocking_notifier_head event_notifier;
>>>>
>>>> - struct ec_response_get_next_event event_data;
>>>> + struct ec_response_get_next_event_v1 event_data;
>>>> int event_size;
>>>> u32 host_event_wake_mask;
>>>> };
>>>> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
>>>> index f2edd99..cc0768e 100644
>>>> --- a/include/linux/mfd/cros_ec_commands.h
>>>> +++ b/include/linux/mfd/cros_ec_commands.h
>>>> @@ -2093,12 +2093,31 @@ union ec_response_get_next_data {
>>>> uint32_t sysrq;
>>>> } __packed;
>>>>
>>>> +union ec_response_get_next_data_v1 {
>>>> + uint8_t key_matrix[16];
>>>> +
>>>> + /* Unaligned */
>>>
>>> That's funny!
>>>
>>>> + uint32_t host_event;
>>>> +
>>>> + uint32_t buttons;
>>>> + uint32_t switches;
>>>> + uint32_t sysrq;
>>>> + uint32_t cec_events;
>>>> + uint8_t cec_message[16];
>>>
>>> Since there are some whitespace alignment issues in here.
>
> Fix the white space issues.

Ok

>
>>>> +} __packed;
>>>
>>> How come these guys have kerneldoc headers?
>
> Consider using kerneldoc headers (not required for this patch).

I already used kerneldoc for the other patch as requested by Enric.

>
>> Can you explicit what should be changed here ?
>
> -^

Ok

Thanks,
Neil

>
>>>> struct ec_response_get_next_event {
>>>> uint8_t event_type;
>>>> /* Followed by event data if any */
>>>> union ec_response_get_next_data data;
>>>> } __packed;
>>>>
>>>> +struct ec_response_get_next_event_v1 {
>>>> + uint8_t event_type;
>>>> + /* Followed by event data if any */
>>>> + union ec_response_get_next_data_v1 data;
>>>> +} __packed;
>>>> +
>>>> /* Bit indices for buttons and switches.*/
>>>> /* Buttons */
>>>> #define EC_MKBP_POWER_BUTTON 0
>>>
>>
>

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