Re: [PATCH 1/4] Bluetooth: btusb: mediatek: use readx_poll_timeout instead of open coding

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 13/09/22 00:18, sean.wang@mediatek.com ha scritto:
> From: Sean Wang <sean.wang@mediatek.com>
> 
> Use readx_poll_timeout instead of open coding to poll the hardware reset
> status until it is done.
> 
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>

Hello Sean, thanks for the patch!
However, there's something to improve...

> ---
>   drivers/bluetooth/btusb.c | 32 ++++++++++++++++++--------------
>   1 file changed, 18 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index c3daba17de7f..4dc9cae3e937 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c

..snip..

> @@ -2910,18 +2918,14 @@ static void btusb_mtk_cmd_timeout(struct hci_dev *hdev)
>   	btusb_mtk_uhw_reg_write(data, MTK_BT_SUBSYS_RST, 0);
>   	btusb_mtk_uhw_reg_read(data, MTK_BT_SUBSYS_RST, &val);
>   
> -	/* Poll the register until reset is completed */
> -	do {
> -		btusb_mtk_uhw_reg_read(data, MTK_BT_MISC, &val);
> -		if (val & MTK_BT_RST_DONE) {
> -			bt_dev_dbg(hdev, "Bluetooth Reset Successfully");
> -			break;
> -		}
> +	err = readx_poll_timeout(btusb_mtk_reset_done, hdev, val,
> +				 val & MTK_BT_RST_DONE,
> +				 100000, 1000000);

I agree with using readx_poll_timeout() instead of open coding the same, but
there's a catch: this macro uses usleep_range(), which is meant to be used
for sleeping less than ~20ms.

Even the kerneldoc at include/linux/iopoll.h advertises that:

  * @sleep_us: Maximum time to sleep between reads in us (0
  *            tight-loops).  Should be less than ~20ms since usleep_range
  *            is used (see Documentation/timers/timers-howto.rst).

So, if there's any reason for which you can't sleep for less than 100ms
per iteration, I'm afraid that you can't use readx_poll_timeout()...
...otherwise, please change sleep_us to 20000 and keep the timeout at 1 sec.

Regards,
Angelo

> +	if (err < 0)
> +		bt_dev_err(hdev, "Reset timeout");
>   
> -		bt_dev_dbg(hdev, "Polling Bluetooth Reset CR");
> -		retry++;
> -		msleep(MTK_BT_RESET_WAIT_MS);
> -	} while (retry < MTK_BT_RESET_NUM_TRIES);
> +	if (val & MTK_BT_RST_DONE)
> +		bt_dev_dbg(hdev, "Bluetooth Reset Successfully");
>   
>   	btusb_mtk_id_get(data, 0x70010200, &val);
>   	if (!val)