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Date: Thu, 30 Sep 2021 13:09:50 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Sven Peter <sven@...npeter.dev>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Guido Günther <agx@...xcpu.org>,
Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
Hector Martin <marcan@...can.st>,
Mohamed Mediouni <mohamed.mediouni@...amail.com>,
Stan Skowronek <stan@...ellium.com>,
Mark Kettenis <mark.kettenis@...all.nl>,
Alexander Graf <graf@...zon.com>,
Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: Re: [PATCH v3 4/6] usb: typec: tipd: Add support for Apple CD321X
On Tue, Sep 28, 2021 at 05:55:00PM +0200, Sven Peter wrote:
> Apple CD321x chips are a variant of the TI TPS 6598x chips.
> The major differences are the changed interrupt numbers and
> the concurrent connection to the SMC which we must not disturb.
>
> Signed-off-by: Sven Peter <sven@...npeter.dev>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> changes since v2:
> - switched from of_device_get_match_data to of_device_is_compatible
> as suggested by Heikki
> - replace "int ret = 0" with "int ret" in cd321x_interrupt since ret
> doesn't need to be initialized
>
> changes since v1:
> - new commit since Heikki suggested to just add a separate irq handler
>
> drivers/usb/typec/tipd/core.c | 63 ++++++++++++++++++++++++++++++-
> drivers/usb/typec/tipd/tps6598x.h | 6 +++
> drivers/usb/typec/tipd/trace.h | 23 +++++++++++
> 3 files changed, 91 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index e785e4aa2d4b..cc4a154eabcb 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -9,6 +9,7 @@
> #include <linux/i2c.h>
> #include <linux/acpi.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> #include <linux/power_supply.h>
> #include <linux/regmap.h>
> #include <linux/interrupt.h>
> @@ -461,6 +462,51 @@ static void tps6598x_handle_plug_event(struct tps6598x *tps, u32 status)
> }
> }
>
> +static irqreturn_t cd321x_interrupt(int irq, void *data)
> +{
> + struct tps6598x *tps = data;
> + u64 event;
> + u32 status;
> + int ret;
> +
> + mutex_lock(&tps->lock);
> +
> + ret = tps6598x_read64(tps, TPS_REG_INT_EVENT1, &event);
> + if (ret) {
> + dev_err(tps->dev, "%s: failed to read events\n", __func__);
> + goto err_unlock;
> + }
> + trace_cd321x_irq(event);
> +
> + if (!event)
> + goto err_unlock;
> +
> + if (!tps6598x_read_status(tps, &status))
> + goto err_clear_ints;
> +
> + if (event & APPLE_CD_REG_INT_POWER_STATUS_UPDATE)
> + if (!tps6598x_read_power_status(tps))
> + goto err_clear_ints;
> +
> + if (event & APPLE_CD_REG_INT_DATA_STATUS_UPDATE)
> + if (!tps6598x_read_data_status(tps))
> + goto err_clear_ints;
> +
> + /* Handle plug insert or removal */
> + if (event & APPLE_CD_REG_INT_PLUG_EVENT)
> + tps6598x_handle_plug_event(tps, status);
> +
> +err_clear_ints:
> + tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event);
> +
> +err_unlock:
> + mutex_unlock(&tps->lock);
> +
> + if (event)
> + return IRQ_HANDLED;
> + return IRQ_NONE;
> +}
> +
> static irqreturn_t tps6598x_interrupt(int irq, void *data)
> {
> struct tps6598x *tps = data;
> @@ -620,6 +666,8 @@ static int devm_tps6598_psy_register(struct tps6598x *tps)
>
> static int tps6598x_probe(struct i2c_client *client)
> {
> + irq_handler_t irq_handler = tps6598x_interrupt;
> + struct device_node *np = client->dev.of_node;
> struct typec_capability typec_cap = { };
> struct tps6598x *tps;
> struct fwnode_handle *fwnode;
> @@ -658,6 +706,18 @@ static int tps6598x_probe(struct i2c_client *client)
> if (ret)
> return ret;
>
> + if (np && of_device_is_compatible(np, "apple,cd321x")) {
> + /* CD321X chips have all interrupts masked initially */
> + ret = tps6598x_write64(tps, TPS_REG_INT_MASK1,
> + APPLE_CD_REG_INT_POWER_STATUS_UPDATE |
> + APPLE_CD_REG_INT_DATA_STATUS_UPDATE |
> + APPLE_CD_REG_INT_PLUG_EVENT);
> + if (ret)
> + return ret;
> +
> + irq_handler = cd321x_interrupt;
> + }
> +
> ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
> if (ret < 0)
> return ret;
> @@ -739,7 +799,7 @@ static int tps6598x_probe(struct i2c_client *client)
> }
>
> ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
> - tps6598x_interrupt,
> + irq_handler,
> IRQF_SHARED | IRQF_ONESHOT,
> dev_name(&client->dev), tps);
> if (ret) {
> @@ -773,6 +833,7 @@ static int tps6598x_remove(struct i2c_client *client)
>
> static const struct of_device_id tps6598x_of_match[] = {
> { .compatible = "ti,tps6598x", },
> + { .compatible = "apple,cd321x", },
> {}
> };
> MODULE_DEVICE_TABLE(of, tps6598x_of_match);
> diff --git a/drivers/usb/typec/tipd/tps6598x.h b/drivers/usb/typec/tipd/tps6598x.h
> index 003a577be216..e13b16419843 100644
> --- a/drivers/usb/typec/tipd/tps6598x.h
> +++ b/drivers/usb/typec/tipd/tps6598x.h
> @@ -129,6 +129,12 @@
> #define TPS_REG_INT_HARD_RESET BIT(1)
> #define TPS_REG_INT_PD_SOFT_RESET BIT(0)
>
> +/* Apple-specific TPS_REG_INT_* bits */
> +#define APPLE_CD_REG_INT_DATA_STATUS_UPDATE BIT(10)
> +#define APPLE_CD_REG_INT_POWER_STATUS_UPDATE BIT(9)
> +#define APPLE_CD_REG_INT_STATUS_UPDATE BIT(8)
> +#define APPLE_CD_REG_INT_PLUG_EVENT BIT(1)
> +
> /* TPS_REG_POWER_STATUS bits */
> #define TPS_POWER_STATUS_CONNECTION(x) TPS_FIELD_GET(BIT(0), (x))
> #define TPS_POWER_STATUS_SOURCESINK(x) TPS_FIELD_GET(BIT(1), (x))
> diff --git a/drivers/usb/typec/tipd/trace.h b/drivers/usb/typec/tipd/trace.h
> index 5d09d6f78930..12cad1bde7cc 100644
> --- a/drivers/usb/typec/tipd/trace.h
> +++ b/drivers/usb/typec/tipd/trace.h
> @@ -67,6 +67,13 @@
> { TPS_REG_INT_USER_VID_ALT_MODE_ATTN_VDM, "USER_VID_ALT_MODE_ATTN_VDM" }, \
> { TPS_REG_INT_USER_VID_ALT_MODE_OTHER_VDM, "USER_VID_ALT_MODE_OTHER_VDM" })
>
> +#define show_cd321x_irq_flags(flags) \
> + __print_flags_u64(flags, "|", \
> + { APPLE_CD_REG_INT_PLUG_EVENT, "PLUG_EVENT" }, \
> + { APPLE_CD_REG_INT_POWER_STATUS_UPDATE, "POWER_STATUS_UPDATE" }, \
> + { APPLE_CD_REG_INT_DATA_STATUS_UPDATE, "DATA_STATUS_UPDATE" }, \
> + { APPLE_CD_REG_INT_STATUS_UPDATE, "STATUS_UPDATE" })
> +
> #define TPS6598X_STATUS_FLAGS_MASK (GENMASK(31, 0) ^ (TPS_STATUS_CONN_STATE_MASK | \
> TPS_STATUS_PP_5V0_SWITCH_MASK | \
> TPS_STATUS_PP_HV_SWITCH_MASK | \
> @@ -207,6 +214,22 @@ TRACE_EVENT(tps6598x_irq,
> show_irq_flags(__entry->event2))
> );
>
> +TRACE_EVENT(cd321x_irq,
> + TP_PROTO(u64 event),
> + TP_ARGS(event),
> +
> + TP_STRUCT__entry(
> + __field(u64, event)
> + ),
> +
> + TP_fast_assign(
> + __entry->event = event;
> + ),
> +
> + TP_printk("event=%s",
> + show_cd321x_irq_flags(__entry->event))
> +);
> +
> TRACE_EVENT(tps6598x_status,
> TP_PROTO(u32 status),
> TP_ARGS(status),
> --
> 2.25.1
--
heikki
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