linux-kernel - Re: [PATCH v2] firmware: ti_sci: Always request response from firmware

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Date:   Tue, 11 Jun 2019 20:31:15 +0300
From:   Tero Kristo <t-kristo@...com>
To:     "Andrew F. Davis" <afd@...com>, Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] firmware: ti_sci: Always request response from
 firmware

On 28/05/2019 18:55, Andrew F. Davis wrote:
> TI-SCI firmware will only respond to messages when the
> TI_SCI_FLAG_REQ_ACK_ON_PROCESSED flag is set. Most messages already do
> this, set this for the ones that do not.
> 
> This will be enforced in future firmware that better match the TI-SCI
> specifications, this patch will not break users of existing firmware.
> 
> Fixes: aa276781a64a ("firmware: Add basic support for TI System Control Interface (TI-SCI) protocol")
> Signed-off-by: Andrew F. Davis <afd@...com>
> Acked-by: Nishanth Menon <nm@...com>
> Tested-by: Alejandro Hernandez <ajhernandez@...com>
> ---
> 
> Changes from v1:
>   - Rebased on v5.2-rc2

Thanks, queuing up for 5.3.

-Tero

> 
>   drivers/firmware/ti_sci.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
> index ef93406ace1b..36ce11a67235 100644
> --- a/drivers/firmware/ti_sci.c
> +++ b/drivers/firmware/ti_sci.c
> @@ -466,9 +466,9 @@ static int ti_sci_cmd_get_revision(struct ti_sci_info *info)
>   	struct ti_sci_xfer *xfer;
>   	int ret;
>   
> -	/* No need to setup flags since it is expected to respond */
>   	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_VERSION,
> -				   0x0, sizeof(struct ti_sci_msg_hdr),
> +				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
> +				   sizeof(struct ti_sci_msg_hdr),
>   				   sizeof(*rev_info));
>   	if (IS_ERR(xfer)) {
>   		ret = PTR_ERR(xfer);
> @@ -596,9 +596,9 @@ static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
>   	info = handle_to_ti_sci_info(handle);
>   	dev = info->dev;
>   
> -	/* Response is expected, so need of any flags */
>   	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_DEVICE_STATE,
> -				   0, sizeof(*req), sizeof(*resp));
> +				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
> +				   sizeof(*req), sizeof(*resp));
>   	if (IS_ERR(xfer)) {
>   		ret = PTR_ERR(xfer);
>   		dev_err(dev, "Message alloc failed(%d)\n", ret);
> 

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