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

> >> +} __packed;
> >
> > How come these guys have kerneldoc headers?

Consider using kerneldoc headers (not required for this patch).

> Can you explicit what should be changed here ?

-^

> >> 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
> >
>

--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

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