linux-kernel - Re: [PATCH] Bluetooth: btmtksdio: Add in-band wakeup support

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Date:   Fri, 10 Jun 2022 09:16:20 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Sean Wang <sean.wang@...iatek.com>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        Soul.Huang@...iatek.com, YN.Chen@...iatek.com,
        Leon.Yen@...iatek.com, Eric-SY.Chang@...iatek.com,
        Deren.Wu@...iatek.com, km.lin@...iatek.com,
        robin.chiu@...iatek.com, Eddie.Chen@...iatek.com,
        ch.yeh@...iatek.com, posh.sun@...iatek.com, ted.huang@...iatek.com,
        Eric.Liang@...iatek.com, Stella.Chang@...iatek.com,
        Tom.Chou@...iatek.com, steve.lee@...iatek.com, jsiuda@...gle.com,
        frankgor@...gle.com, abhishekpandit@...gle.com,
        michaelfsun@...gle.com, mcchou@...omium.org, shawnku@...gle.com,
        linux-bluetooth@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Yake Yang <yake.yang@...iatek.com>
Subject: Re: [PATCH] Bluetooth: btmtksdio: Add in-band wakeup support

Dear Sean,


Thank you for the patch.

Am 10.06.22 um 02:17 schrieb sean.wang@...iatek.com:
> From: Sean Wang <sean.wang@...iatek.com>
> 
> 'ce64b3e94919 ("Bluetooth: mt7921s: Support wake on bluetooth")'
> have added the waken-on-bluetooth via dedicated GPIO.

Maybe:

Commit ce64b3e94919 ("Bluetooth: mt7921s: Support wake on bluetooth") 
adds the wake on bluethooth via a dedicated GPIO.

> The patch extends the function to the waken-on-bluetooth via SDIO DAT1 pin
> (inband wakeup) when the SDIO host driver is able to support.

Maybe:

Extend the wake-on-bluetooth to use the SDIO DAT1 pin (in-band wakeup), 
when supported by the SDIO host driver.

How did you test this? In what datasheet is it documented?

> Co-developed-by: Yake Yang <yake.yang@...iatek.com>
> Signed-off-by: Yake Yang <yake.yang@...iatek.com>
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> ---
>   drivers/bluetooth/btmtksdio.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
> index d6700efcfe8c..9ed3af4ba51a 100644
> --- a/drivers/bluetooth/btmtksdio.c
> +++ b/drivers/bluetooth/btmtksdio.c
> @@ -118,6 +118,7 @@ MODULE_DEVICE_TABLE(sdio, btmtksdio_table);
>   #define BTMTKSDIO_FUNC_ENABLED		3
>   #define BTMTKSDIO_PATCH_ENABLED		4
>   #define BTMTKSDIO_HW_RESET_ACTIVE	5
> +#define BTMTKSDIO_INBAND_WAKEUP		6
>   
>   struct mtkbtsdio_hdr {
>   	__le16	len;
> @@ -1294,6 +1295,9 @@ static bool btmtksdio_sdio_wakeup(struct hci_dev *hdev)
>   		.wakeup_delay = cpu_to_le16(0x20),
>   	};
>   
> +	if (test_bit(BTMTKSDIO_INBAND_WAKEUP, &bdev->tx_state))
> +		return may_wakeup;
> +
>   	if (may_wakeup && bdev->data->chipid == 0x7921) {
>   		struct sk_buff *skb;
>   
> @@ -1384,6 +1388,10 @@ static int btmtksdio_probe(struct sdio_func *func,
>   	 */
>   	pm_runtime_put_noidle(bdev->dev);
>   
> +	/* Mark if the mmc host can support waken by SDIO */

Maybe:

Mark if MMC host supports wake on bluetooth by SDIO

> +	if (device_can_wakeup(func->card->host->parent))
> +		set_bit(BTMTKSDIO_INBAND_WAKEUP, &bdev->tx_state);
> +
>   	err = device_init_wakeup(bdev->dev, true);
>   	if (err)
>   		bt_dev_err(hdev, "failed to initialize device wakeup");


Kind regards,

Paul