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Date: Fri, 21 Dec 2018 07:24:44 +0000
From: Lee Jones <lee.jones@...aro.org>
To: egranata@...gle.com
Cc: Benson Leung <bleung@...omium.org>,
Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
Gwendal Grignou <gwendal@...gle.com>,
Brian Norris <briannorris@...gle.com>,
Enrico Granata <egranata@...omium.org>
Subject: Re: [PATCH] mfd: cros_ec: Add support for MKBP more event flags
On Thu, 20 Dec 2018, egranata@...gle.com wrote:
> From: Enrico Granata <egranata@...omium.org>
>
> The ChromeOS EC has support for signaling to the host that
> a single IRQ can serve multiple MKBP events.
>
> Doing this serves an optimization purpose, as it minimizes the
> number of round-trips into the interrupt handling machinery, and
> it proves beneficial to sensor timestamping as it keeps the desired
> synchronization of event times between the two processors.
>
> This patch adds kernel support for this EC feature, allowing the
> ec_irq to loop until all events have been served.
>
> Signed-off-by: Enrico Granata <egranata@...omium.org>
> ---
What is this?
A [RESEND]? If so, you should s/[PATCH]/[RESEND/ in the subject line.
An updated patch? If so, you need a Changelog here and a [PATCH v2].
Also, submitting in-reply-to isn't scalable.
Please resubmit this patch.
> drivers/mfd/cros_ec.c | 20 +++++++++++++--
> drivers/platform/chrome/cros_ec_proto.c | 33 +++++++++++--------------
> include/linux/mfd/cros_ec.h | 7 ++++--
> include/linux/mfd/cros_ec_commands.h | 15 +++++++++++
> 4 files changed, 53 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index fe6f83766144f..17903a378aa1a 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -51,13 +51,16 @@ static const struct mfd_cell ec_pd_cell = {
> .pdata_size = sizeof(pd_p),
> };
>
> -static irqreturn_t ec_irq_thread(int irq, void *data)
> +static bool ec_handle_event(struct cros_ec_device *ec_dev)
> {
> - struct cros_ec_device *ec_dev = data;
> bool wake_event = true;
> int ret;
> + bool ec_has_more_events = false;
>
> ret = cros_ec_get_next_event(ec_dev, &wake_event);
> + if (ret > 0)
> + ec_has_more_events =
> + ec_dev->event_data.event_type & EC_MKBP_HAS_MORE_EVENTS;
>
> /*
> * Signal only if wake host events or any interrupt if
> @@ -70,6 +73,19 @@ static irqreturn_t ec_irq_thread(int irq, void *data)
> if (ret > 0)
> blocking_notifier_call_chain(&ec_dev->event_notifier,
> 0, ec_dev);
> +
> + return ec_has_more_events;
> +}
> +
> +static irqreturn_t ec_irq_thread(int irq, void *data)
> +{
> + struct cros_ec_device *ec_dev = data;
> + bool ec_has_more_events;
> +
> + do {
> + ec_has_more_events = ec_handle_event(ec_dev);
> + } while (ec_has_more_events);
> +
> return IRQ_HANDLED;
> }
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index b6fd4838f60f3..bb126d95b2fd4 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -420,10 +420,14 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
> ret = cros_ec_get_host_command_version_mask(ec_dev,
> EC_CMD_GET_NEXT_EVENT,
> &ver_mask);
> - if (ret < 0 || ver_mask == 0)
> + if (ret < 0 || ver_mask == 0) {
> ec_dev->mkbp_event_supported = 0;
> - else
> - ec_dev->mkbp_event_supported = 1;
> + dev_info(ec_dev->dev, "MKBP not supported\n");
> + } else {
> + ec_dev->mkbp_event_supported = fls(ver_mask);
> + dev_info(ec_dev->dev, "MKBP support version %u\n",
> + ec_dev->mkbp_event_supported - 1);
> + }
>
> /*
> * Get host event wake mask, assume all events are wake events
> @@ -530,28 +534,19 @@ 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;
> + const int cmd_version = ec_dev->mkbp_event_supported - 1;
>
> if (ec_dev->suspended) {
> dev_dbg(ec_dev->dev, "Device suspended.\n");
> return -EHOSTDOWN;
> }
>
> - 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;
> -
> - /* Fallback to version 0 for future send attempts */
> - cmd_version = 0;
> - }
> -
> - ret = get_next_event_xfer(ec_dev, msg, cmd_version,
> + if (cmd_version == 0)
> + return get_next_event_xfer(ec_dev, msg, 0,
> sizeof(struct ec_response_get_next_event));
>
> - return ret;
> + return get_next_event_xfer(ec_dev, msg, cmd_version,
> + sizeof(struct ec_response_get_next_event_v1));
> }
>
> static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
> @@ -607,11 +602,13 @@ EXPORT_SYMBOL(cros_ec_get_next_event);
>
> u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev)
> {
> + u32 event_type =
> + ec_dev->event_data.event_type & EC_MKBP_EVENT_TYPE_MASK;
> u32 host_event;
>
> BUG_ON(!ec_dev->mkbp_event_supported);
>
> - if (ec_dev->event_data.event_type != EC_MKBP_EVENT_HOST_EVENT)
> + if (event_type != EC_MKBP_EVENT_HOST_EVENT)
> return 0;
>
> if (ec_dev->event_size != sizeof(host_event)) {
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index e44e3ec8a9c7d..cb07ee95a6eb8 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -119,7 +119,9 @@ struct cros_ec_command {
> * code.
> * @pkt_xfer: Send packet to EC and get response.
> * @lock: One transaction at a time.
> - * @mkbp_event_supported: True if this EC supports the MKBP event protocol.
> + * @mkbp_event_supported: 0 if MKBP not supported. Otherwise its value is
> + * the maximum supported version of the MKBP host event
> + * command + 1.
> * @event_notifier: Interrupt event notifier for transport devices.
> * @event_data: Raw payload transferred with the MKBP event.
> * @event_size: Size in bytes of the event data.
> @@ -152,7 +154,8 @@ struct cros_ec_device {
> int (*pkt_xfer)(struct cros_ec_device *ec,
> struct cros_ec_command *msg);
> struct mutex lock;
> - bool mkbp_event_supported;
> + /* 0 == not supported, otherwise it supports version x - 1 */
> + u8 mkbp_event_supported;
> struct blocking_notifier_head event_notifier;
>
> struct ec_response_get_next_event_v1 event_data;
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index 9a9631f0559e2..3f013593d0107 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -2146,6 +2146,14 @@ struct ec_result_keyscan_seq_ctrl {
> */
> #define EC_CMD_GET_NEXT_EVENT 0x67
>
> +#define EC_MKBP_HAS_MORE_EVENTS_SHIFT 7
> +
> +/* EC can provide more MKBP events to host */
> +#define EC_MKBP_HAS_MORE_EVENTS (1 << EC_MKBP_HAS_MORE_EVENTS_SHIFT)
> +
> +/* The mask to apply to get the raw event type */
> +#define EC_MKBP_EVENT_TYPE_MASK ((1 << EC_MKBP_HAS_MORE_EVENTS_SHIFT) - 1)
> +
> enum ec_mkbp_event {
> /* Keyboard matrix changed. The event data is the new matrix state. */
> EC_MKBP_EVENT_KEY_MATRIX = 0,
> @@ -2173,6 +2181,13 @@ enum ec_mkbp_event {
>
> /* Number of MKBP events */
> EC_MKBP_EVENT_COUNT,
> +
> + /*
> + * Maximum possible event type
> + * The most significant bit of event type is used to indicate that
> + * the EC has multiple events for the AP to serve
> + */
> + EC_MKBP_EVENT_MAX_TYPE = EC_MKBP_EVENT_TYPE_MASK,
> };
>
> union ec_response_get_next_data {
--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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