Re: [PATCH 03/31] swim: Enable the drive when probing

Le 16/07/2026 =C3=A0 12:02, Finn Thain a =C3=A9crit=C2=A0:
> According to the ISM spec, the MOTON bit "causes the Enable 1 and Enable=
 2
> signals to be turned on to the drive." It doesn't actually turn on the
> motor. When selecting a drive, enable MOTON. Disable it upon eject or
> release. This fixes detection of the Sony FDHD drive.
>=20
> Fixes: 8852ecd97488 ("m68k: mac - Add SWIM floppy support")
> Signed-off-by: Finn Thain <[email protected]>
> ---
>   drivers/block/swim.c | 18 +++++++++++++++---
>   1 file changed, 15 insertions(+), 3 deletions(-)
>=20

Reviewed-by: Laurent Vivier <[email protected]>

> diff --git a/drivers/block/swim.c b/drivers/block/swim.c
> index 2c52a210f4a6..2a400e544959 100644
> --- a/drivers/block/swim.c
> +++ b/drivers/block/swim.c
> @@ -154,8 +154,9 @@ struct iwm {
>   /*--------------------------------------------------------------------=
=2D-------*/
>  =20
>   enum drive_location {
> -	INTERNAL_DRIVE =3D 0x02,
> -	EXTERNAL_DRIVE =3D 0x04,
> +	NO_DRIVE =3D 0,
> +	INTERNAL_DRIVE =3D BIT(1),
> +	EXTERNAL_DRIVE =3D BIT(2),
>   };
>  =20
>   enum media_type {
> @@ -311,9 +312,15 @@ static inline void swim_drive(struct swim __iomem *=
base,
>   	if (location =3D=3D INTERNAL_DRIVE) {
>   		swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
>   		swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
> +		swim_write(base, mode1, MOTON);
>   	} else if (location =3D=3D EXTERNAL_DRIVE) {
>   		swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
>   		swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
> +		swim_write(base, mode1, MOTON);
> +	} else {
> +		swim_write(base, mode0, INTERNAL_DRIVE);
> +		swim_write(base, mode0, EXTERNAL_DRIVE);
> +		swim_write(base, mode0, MOTON);
>   	}
>   }
>  =20
> @@ -447,6 +454,7 @@ static int floppy_eject(struct floppy_state *fs)
>   	swim_drive(base, fs->location);
>   	swim_motor(base, OFF);
>   	swim_eject(base);
> +	swim_drive(base, NO_DRIVE);
>  =20
>   	fs->disk_in =3D 0;
>   	fs->ejected =3D 1;
> @@ -652,8 +660,10 @@ static int floppy_open(struct gendisk *disk, blk_mo=
de_t mode)
>   	else if (fs->ref_count > 0)
>   		--fs->ref_count;
>  =20
> -	if (fs->ref_count =3D=3D 0)
> +	if (fs->ref_count =3D=3D 0) {
>   		swim_motor(base, OFF);
> +		swim_drive(base, NO_DRIVE);
> +	}
>   	return err;
>   }
>  =20
> @@ -682,6 +692,7 @@ static void floppy_release(struct gendisk *disk)
>   	if (fs->ref_count =3D=3D 0) {
>   		swim_drive(base, fs->location);
>   		swim_motor(base, OFF);
> +		swim_drive(base, NO_DRIVE);
>   	}
>   	mutex_unlock(&swim_mutex);
>   }
> @@ -804,6 +815,7 @@ static int swim_floppy_init(struct swim_priv *swd)
>   	if (swim_readbit(base, DRIVE_PRESENT) &&
>   	    !swim_readbit(base, ONEMEG_DRIVE))
>   		swim_add_floppy(swd, EXTERNAL_DRIVE);
> +	swim_drive(base, NO_DRIVE);
>  =20
>   	/* register floppy drives */
>  =20