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Subject[PATCH v6 4/7] platform/chrome: cros_typec_switch: Add event check
Date
The ChromeOS EC updates Type-C status events when mux set requests from
the Application Processor (AP) are completed. Add a check to the
flow of configuring muxes to look for this status done bit, so that
the driver is aware that the mux set completed successfully or not.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---

Changes since v5:
- Change "Chrome OS" -> "ChromeOS".
- Make cros_ec_cmd() invocation fit on 1 line.

Changes since v4:
- Update cros_ec_command() to cros_ec_cmd().
- Dropped unnecessary Reported-by tag (since this patch is not a
bug fix).

Changes since v3:
- No changes.

Changes since v2:
- Fixed missing "static" identifier.

Changes since v1:
- No changes.

drivers/platform/chrome/cros_typec_switch.c | 71 ++++++++++++++++++++-
1 file changed, 69 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c
index eae7d26416aa..dc84cdec8f7f 100644
--- a/drivers/platform/chrome/cros_typec_switch.c
+++ b/drivers/platform/chrome/cros_typec_switch.c
@@ -7,6 +7,8 @@
*/

#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
@@ -60,6 +62,39 @@ static int cros_typec_get_mux_state(unsigned long mode, struct typec_altmode *al
return ret;
}

+static int cros_typec_send_clear_event(struct cros_typec_switch_data *sdata, int port_num,
+ u32 events_mask)
+{
+ struct ec_params_typec_control req = {
+ .port = port_num,
+ .command = TYPEC_CONTROL_COMMAND_CLEAR_EVENTS,
+ .clear_events_mask = events_mask,
+ };
+
+ return cros_ec_cmd(sdata->ec, 0, EC_CMD_TYPEC_CONTROL, &req, sizeof(req), NULL, 0);
+}
+
+static bool cros_typec_check_event(struct cros_typec_switch_data *sdata, int port_num, u32 mask)
+{
+ struct ec_response_typec_status resp;
+ struct ec_params_typec_status req = {
+ .port = port_num,
+ };
+ int ret;
+
+ ret = cros_ec_cmd(sdata->ec, 0, EC_CMD_TYPEC_STATUS, &req, sizeof(req),
+ &resp, sizeof(resp));
+ if (ret < 0) {
+ dev_warn(sdata->dev, "EC_CMD_TYPEC_STATUS failed for port: %d\n", port_num);
+ return false;
+ }
+
+ if (resp.events & mask)
+ return true;
+
+ return false;
+}
+
/*
* The ChromeOS EC treats both mode-switches and retimers as "muxes" for the purposes of the
* host command API. This common function configures and verifies the retimer/mode-switch
@@ -68,12 +103,44 @@ static int cros_typec_get_mux_state(unsigned long mode, struct typec_altmode *al
static int cros_typec_configure_mux(struct cros_typec_switch_data *sdata, int port_num, int index,
unsigned long mode, struct typec_altmode *alt)
{
- int ret = cros_typec_get_mux_state(mode, alt);
+ unsigned long end;
+ u32 event_mask;
+ u8 mux_state;
+ int ret;
+
+ ret = cros_typec_get_mux_state(mode, alt);
+ if (ret < 0)
+ return ret;
+ mux_state = (u8)ret;
+
+ /* Clear any old mux set done event. */
+ if (index == 0)
+ event_mask = PD_STATUS_EVENT_MUX_0_SET_DONE;
+ else
+ event_mask = PD_STATUS_EVENT_MUX_1_SET_DONE;

+ ret = cros_typec_send_clear_event(sdata, port_num, event_mask);
if (ret < 0)
return ret;

- return cros_typec_cmd_mux_set(sdata, port_num, index, (u8)ret);
+ /* Send the set command. */
+ ret = cros_typec_cmd_mux_set(sdata, port_num, index, mux_state);
+ if (ret < 0)
+ return ret;
+
+ /* Check for the mux set done event. */
+ end = jiffies + msecs_to_jiffies(1000);
+ do {
+ if (cros_typec_check_event(sdata, port_num, event_mask))
+ return 0;
+
+ usleep_range(500, 1000);
+ } while (time_before(jiffies, end));
+
+ dev_err(sdata->dev, "Timed out waiting for mux set done on index: %d, state: %d\n",
+ index, mux_state);
+
+ return -ETIMEDOUT;
}

static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
--
2.37.1.595.g718a3a8f04-goog
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