[U-Boot] [PATCH] mvsata_ide: adjust port init sequence

[Sergei Shtylyov]

Hello.

On 04-09-2010 14:34, Albert Aribaud wrote:

> mvsata_ide_initialize_port(): adjust init sequence (SStatus
> should be checked only after all writes to SControl) and
> return success/failure to ide_preinit().

> Also, as some tests showed init durations in the hundreds
> of us, raise the time-out to 01 ms to be on the safe side.
> ---
>   drivers/block/mvsata_ide.c |   22 ++++++++++++++--------
>   1 files changed, 14 insertions(+), 8 deletions(-)

> diff --git a/drivers/block/mvsata_ide.c b/drivers/block/mvsata_ide.c
> index 077b278..2b6b706 100644
> --- a/drivers/block/mvsata_ide.c
> +++ b/drivers/block/mvsata_ide.c
> @@ -97,23 +97,27 @@ struct mvsata_port_registers {
>    * DET back to "no action".
>    */
>
> -static void mvsata_ide_initialize_port(struct mvsata_port_registers *port)
> +static int mvsata_ide_initialize_port(struct mvsata_port_registers *port)
>   {
>   	u32 control;
>   	u32 status;
> -	u32 tout = 50; /* wait at most 50 us for SATA reset to complete */
> +	u32 tout = 10000; /* wait at most 10 ms for SATA reset to complete */
>
> +	/* Set control IPM to 3 (no low power) and DET to 1 (initialize) */
>   	control = readl(&port->scontrol);
>   	control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_INIT;
> +	/* Toggle control DET back to 0 (normal operation) */

    But you haven't set it to 1 yet. Maybe the comment is misplaced?

>   	writel(control, &port->scontrol);
> +	control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_USE;
> +	writel(control, &port->scontrol);
> +	/* wait for status DET to become 3 (device and communication OK) */
>   	while (--tout) {
>   		status = readl(&port->sstatus)&  MVSATA_SSTATUS_DET_MASK;
>   		if (status == MVSATA_SSTATUS_DET_DEVCOMM)
>   			break;
>   		udelay(1);
>   	}
> -	control = (control&  ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_USE;
> -	writel(control,&port->scontrol);
> +	return (tout? 0: 1);

    Why not !tout? (And you forgot a space before colon. :-)

WBR, Sergei