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[108.228.232.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33ba4fbd424sm440196eec.31.2026.09.10.13.14.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Sep 2026 13:14:56 -0700 (PDT) Message-ID: <5063b29c-e686-472c-8b80-c6c68def0d0e@gmail.com> Date: Thu, 10 Sep 2026 13:14:54 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/15] HID: hid-oxp: handle controller reinitialization across suspend To: Andrei Aldea , Jiri Kosina , Benjamin Tissoires Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Lee Jones , Pavel Machek , linux-leds@vger.kernel.org References: <20260910032115.28669-1-andrei1998@gmail.com> <20260910032115.28669-11-andrei1998@gmail.com> Content-Language: en-US From: "Derek J. Clark" In-Reply-To: <20260910032115.28669-11-andrei1998@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/9/26 20:21, Andrei Aldea wrote: > A Gen2 monocolor reply uses the same command value as the asynchronous MCU > reset notification. Treating every such report as a reset can schedule a > spurious controller reinitialization. > > Track an outstanding monocolor write by command and zone under a per-HID > spinlock, and consume its matching acknowledgment before considering the > report a reset notification. Clear pending reply state during suspend and > teardown. A missing reply does not change legacy transport success > semantics. > > For system suspend, disable and drain initialized configuration work and > reject new output while the device is suspended. Re-enable work on resume > and queue a fallback reinitialization after the documented MCU reset > interval. A qualifying reset notification can still bring that work > forward. Leave runtime autosuspend unchanged. > > Fixes: 2f424f28fb39 ("HID: hid-oxp: Add Second Generation Gamepad Mode Switch") > Assisted-by: LLM > Reviewed-by: Derek J. Clark > Signed-off-by: Andrei Aldea > --- > drivers/hid/hid-oxp.c | 116 ++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 107 insertions(+), 9 deletions(-) > > diff --git a/drivers/hid/hid-oxp.c b/drivers/hid/hid-oxp.c > index 7b36687..e26e6a9 100644 > --- a/drivers/hid/hid-oxp.c > +++ b/drivers/hid/hid-oxp.c > @@ -16,6 +16,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -24,6 +25,7 @@ > > #define OXP_PACKET_SIZE 64 > #define OXP_STATUS_HEADER_SIZE 6 > +#define OXP_STATUS_ACK 0x20 > > #define GEN1_MESSAGE_ID 0xff > #define GEN2_MESSAGE_ID 0x3f > @@ -185,6 +187,10 @@ struct oxp_hid_cfg { > struct hid_device *hdev; > struct mutex cfg_mutex; /*ensure single synchronous output report*/ > struct mutex rgb_mutex; /*serialize complete RGB transactions*/ > + spinlock_t rgb_reply_lock; > + u8 rgb_reply_command; > + u8 rgb_reply_zone; > + bool rgb_reply_pending; > u8 rgb_brightness; > u8 gamepad_mode; > u8 rumble_intensity; > @@ -193,6 +199,7 @@ struct oxp_hid_cfg { > u8 rgb_en; > bool rgb_work_initialized; > bool gen2_work_initialized; > + bool suspended; > bool removing; > }; > > @@ -371,7 +378,7 @@ static void oxp_mcu_init_fn(struct work_struct *work) > u8 gp_mode_data[3] = { OXP_GP_MODE_DEBUG, 0x01, 0x02 }; > int ret; > > - if (READ_ONCE(cfg->removing)) > + if (READ_ONCE(cfg->suspended) || READ_ONCE(cfg->removing)) > return; > > /* Re-apply the button mapping */ > @@ -410,6 +417,7 @@ static int oxp_hid_raw_event_gen_2(struct hid_device *hdev, > struct oxp_hid_cfg *cfg = hid_get_drvdata(hdev); > struct led_classdev_mc *led_mc = cfg->led_mc; > struct oxp_gen_2_rgb_report *rgb_rep; > + bool solicited = false; > > if (size < OXP_STATUS_HEADER_SIZE) > return 0; > @@ -417,11 +425,26 @@ static int oxp_hid_raw_event_gen_2(struct hid_device *hdev, > if (data[0] != OXP_FID_GEN2_STATUS_EVENT) > return 0; > > + /* A monocolor acknowledgment is not an MCU reset notification. */ > + if (data[5] == OXP_STATUS_ACK) { > + scoped_guard(spinlock_irqsave, &cfg->rgb_reply_lock) { > + if (cfg->rgb_reply_pending && > + data[3] == cfg->rgb_reply_command && > + data[4] == cfg->rgb_reply_zone) { > + cfg->rgb_reply_pending = false; > + solicited = true; > + } > + } > + if (solicited) > + return 0; > + } > + > /* Sent ~6s after resume event, indicating the MCU has fully reset. > * Re-apply our settings after this has been received. > */ > if (data[3] == OXP_EFFECT_MONO_TRUE) { > if (READ_ONCE(cfg->gen2_work_initialized) && > + !READ_ONCE(cfg->suspended) && > !READ_ONCE(cfg->removing)) > mod_delayed_work(system_dfl_wq, &cfg->oxp_mcu_init, > msecs_to_jiffies(50)); > @@ -489,6 +512,7 @@ static int mcu_property_out(struct oxp_hid_cfg *cfg, u8 *header, size_t header_s > size_t data_size, u8 *footer, size_t footer_size) > { > unsigned char *dmabuf __free(kfree) = kzalloc(OXP_PACKET_SIZE, GFP_KERNEL); > + bool rgb_write; > int ret; > > if (!dmabuf) > @@ -500,6 +524,19 @@ static int mcu_property_out(struct oxp_hid_cfg *cfg, u8 *header, size_t header_s > guard(mutex)(&cfg->cfg_mutex); > if (READ_ONCE(cfg->removing)) > return -ENODEV; > + if (READ_ONCE(cfg->suspended)) > + return -EHOSTDOWN; > + > + rgb_write = header_size && data_size > 1 && > + header[0] == OXP_FID_GEN2_STATUS_EVENT && > + data[0] == OXP_EFFECT_MONO_TRUE; > + if (rgb_write) { > + scoped_guard(spinlock_irqsave, &cfg->rgb_reply_lock) { > + cfg->rgb_reply_command = data[0]; > + cfg->rgb_reply_zone = data[1]; > + cfg->rgb_reply_pending = true; > + } > + } > > memcpy(dmabuf, header, header_size); > memcpy(dmabuf + header_size, data, data_size); > @@ -509,12 +546,18 @@ static int mcu_property_out(struct oxp_hid_cfg *cfg, u8 *header, size_t header_s > dev_dbg(&cfg->hdev->dev, "raw data: [%*ph]\n", OXP_PACKET_SIZE, dmabuf); > > ret = hid_hw_output_report(cfg->hdev, dmabuf, OXP_PACKET_SIZE); > - if (ret < 0) > - return ret; > - > /* MCU takes 200ms to be ready for another command. */ > msleep(200); > - return ret == OXP_PACKET_SIZE ? 0 : -EIO; > + if (ret >= 0) > + ret = ret == OXP_PACKET_SIZE ? 0 : -EIO; > + > + if (rgb_write) { > + scoped_guard(spinlock_irqsave, &cfg->rgb_reply_lock) { > + cfg->rgb_reply_pending = false; > + } > + } > + > + return ret; > } > > static int oxp_gen_1_property_out(struct oxp_hid_cfg *cfg, enum oxp_function_index fid, u8 *data, > @@ -748,7 +791,7 @@ static void oxp_btn_queue_fn(struct work_struct *work) > struct oxp_hid_cfg, oxp_btn_queue); > int ret; > > - if (READ_ONCE(cfg->removing)) > + if (READ_ONCE(cfg->suspended) || READ_ONCE(cfg->removing)) > return; > > ret = oxp_set_buttons(cfg); > @@ -837,7 +880,7 @@ static ssize_t map_button_store(struct device *dev, > default: > return -EINVAL; > } > - if (!READ_ONCE(cfg->removing)) > + if (!READ_ONCE(cfg->suspended) && !READ_ONCE(cfg->removing)) > mod_delayed_work(system_dfl_wq, &cfg->oxp_btn_queue, > msecs_to_jiffies(50)); > return count; > @@ -1413,7 +1456,7 @@ static void oxp_rgb_queue_fn(struct work_struct *work) > u8 val = 4 * brightness / max_brightness; > int ret; > > - if (READ_ONCE(cfg->removing)) > + if (READ_ONCE(cfg->suspended) || READ_ONCE(cfg->removing)) > return; > > guard(mutex)(&cfg->rgb_mutex); > @@ -1442,7 +1485,7 @@ static void oxp_rgb_brightness_set(struct led_classdev *led_cdev, > struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(led_cdev); > struct oxp_hid_cfg *cfg = container_of(mc_cdev, struct oxp_hid_cfg, cdev); > > - if (READ_ONCE(cfg->removing)) > + if (READ_ONCE(cfg->suspended) || READ_ONCE(cfg->removing)) > return; > > led_cdev->brightness = brightness; > @@ -1554,6 +1597,9 @@ static void oxp_drain_output(struct oxp_hid_cfg *cfg) > static void oxp_quiesce_work(struct oxp_hid_cfg *cfg) > { > WRITE_ONCE(cfg->removing, true); > + scoped_guard(spinlock_irqsave, &cfg->rgb_reply_lock) { > + cfg->rgb_reply_pending = false; > + } > if (cfg->rgb_work_initialized) > disable_delayed_work_sync(&cfg->oxp_rgb_queue); > if (cfg->gen2_work_initialized) { > @@ -1584,6 +1630,7 @@ static int oxp_cfg_probe(struct hid_device *hdev, u16 up) > cfg->hdev = hdev; > mutex_init(&cfg->cfg_mutex); > mutex_init(&cfg->rgb_mutex); > + spin_lock_init(&cfg->rgb_reply_lock); > > /* Clear drvdata after registered callback objects have been released. */ > hid_set_drvdata(hdev, cfg); > @@ -1714,6 +1761,54 @@ static void oxp_hid_remove(struct hid_device *hdev) > hid_hw_stop(hdev); > } > > +static int __maybe_unused oxp_hid_suspend(struct hid_device *hdev, > + pm_message_t message) > +{ > + struct oxp_hid_cfg *cfg = hid_get_drvdata(hdev); > + > + if (!cfg || PMSG_IS_AUTO(message)) > + return 0; > + > + WRITE_ONCE(cfg->suspended, true); > + scoped_guard(spinlock_irqsave, &cfg->rgb_reply_lock) { > + cfg->rgb_reply_pending = false; > + } > + if (cfg->rgb_work_initialized) > + disable_delayed_work_sync(&cfg->oxp_rgb_queue); > + if (cfg->gen2_work_initialized) { > + disable_delayed_work_sync(&cfg->oxp_btn_queue); > + disable_delayed_work_sync(&cfg->oxp_mcu_init); > + } > + oxp_drain_output(cfg); > + > + return 0; > +} > + > +static int __maybe_unused oxp_hid_resume(struct hid_device *hdev) > +{ > + struct oxp_hid_cfg *cfg = hid_get_drvdata(hdev); > + > + if (!cfg || !READ_ONCE(cfg->suspended) || > + READ_ONCE(cfg->removing)) > + return 0; > + > + if (cfg->rgb_work_initialized) > + enable_delayed_work(&cfg->oxp_rgb_queue); > + if (cfg->gen2_work_initialized) { > + enable_delayed_work(&cfg->oxp_btn_queue); > + enable_delayed_work(&cfg->oxp_mcu_init); > + } > + WRITE_ONCE(cfg->suspended, false); > + if (!cfg->gen2_work_initialized) > + return 0; > + > + /* Allow the controller MCU to finish rebooting before restoring state. */ > + queue_delayed_work(system_dfl_wq, &cfg->oxp_mcu_init, > + msecs_to_jiffies(6500)); > + > + return 0; > +} > + > static const struct hid_device_id oxp_devices[] = { > { HID_USB_DEVICE(USB_VENDOR_ID_CRSC, USB_DEVICE_ID_ONEXPLAYER_GEN1) }, > { HID_USB_DEVICE(USB_VENDOR_ID_WCH, USB_DEVICE_ID_ONEXPLAYER_GEN2) }, > @@ -1727,6 +1822,9 @@ static struct hid_driver hid_oxp = { > .probe = oxp_hid_probe, > .remove = oxp_hid_remove, > .raw_event = oxp_hid_raw_event, > + .suspend = pm_ptr(oxp_hid_suspend), > + .resume = pm_ptr(oxp_hid_resume), > + .reset_resume = pm_ptr(oxp_hid_resume), > }; > module_hid_driver(hid_oxp); > Tested-by: Derek J. Clark Reviewed-by: Derek J. Clark