From: Etienne Carriere <etienne.carriere@linaro.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-kernel@vger.kernel.org,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
Cristian Marussi <cristian.marussi@arm.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Souvik Chakravarty <Souvik.Chakravarty@arm.com>
Subject: Re: [PATCH 2/5] firmware: arm_scmi: fix transfer missing re-initialization
Date: Fri, 9 Oct 2020 14:38:16 +0200 [thread overview]
Message-ID: <CAN5uoS9EGrzoaJ7tA__A=dPx2Y1Cp=v2THMm9YJTrOLUpkaggg@mail.gmail.com> (raw)
In-Reply-To: <20201008211804.soegjqsvmsgfmcne@bogus>
On Thu, 8 Oct 2020 at 23:18, Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> On Thu, Oct 08, 2020 at 04:37:19PM +0200, Etienne Carriere wrote:
> > Implement helper function scmi_do_xfer_again() to process consecutive
> > transfers that are initialized only once with scmi_xfer_get_init()
> > and hence get the pool completion and responses message length not
> > reloaded regarding last completed transfer.
> >
> > Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> > ---
> > drivers/firmware/arm_scmi/base.c | 2 +-
> > drivers/firmware/arm_scmi/clock.c | 2 +-
> > drivers/firmware/arm_scmi/common.h | 2 ++
> > drivers/firmware/arm_scmi/driver.c | 10 ++++++++++
> > drivers/firmware/arm_scmi/perf.c | 2 +-
> > drivers/firmware/arm_scmi/sensors.c | 2 +-
> > 6 files changed, 16 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c
> > index 9853bd3c4d45..508f214baa1b 100644
> > --- a/drivers/firmware/arm_scmi/base.c
> > +++ b/drivers/firmware/arm_scmi/base.c
> > @@ -183,7 +183,7 @@ static int scmi_base_implementation_list_get(const struct scmi_handle *handle,
> > /* Set the number of protocols to be skipped/already read */
> > *num_skip = cpu_to_le32(tot_num_ret);
> >
> > - ret = scmi_do_xfer(handle, t);
> > + ret = scmi_do_xfer_again(handle, t);
> > if (ret)
> > break;
> >
> > diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
> > index c1cfe3ee3d55..9bb54c1a8d55 100644
> > --- a/drivers/firmware/arm_scmi/clock.c
> > +++ b/drivers/firmware/arm_scmi/clock.c
> > @@ -161,7 +161,7 @@ scmi_clock_describe_rates_get(const struct scmi_handle *handle, u32 clk_id,
> > /* Set the number of rates to be skipped/already read */
> > clk_desc->rate_index = cpu_to_le32(tot_rate_cnt);
> >
> > - ret = scmi_do_xfer(handle, t);
> > + ret = scmi_do_xfer_again(handle, t);
> > if (ret)
> > goto err;
> >
> > diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
> > index 37fb583f1bf5..6d4eea7b0f3e 100644
> > --- a/drivers/firmware/arm_scmi/common.h
> > +++ b/drivers/firmware/arm_scmi/common.h
> > @@ -143,6 +143,8 @@ struct scmi_xfer {
> >
> > void scmi_xfer_put(const struct scmi_handle *h, struct scmi_xfer *xfer);
> > int scmi_do_xfer(const struct scmi_handle *h, struct scmi_xfer *xfer);
> > +int scmi_do_xfer_again(const struct scmi_handle *handle,
> > + struct scmi_xfer *xfer);
> > int scmi_do_xfer_with_response(const struct scmi_handle *h,
> > struct scmi_xfer *xfer);
> > int scmi_xfer_get_init(const struct scmi_handle *h, u8 msg_id, u8 prot_id,
> > diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> > index c5dea87edf8f..887cb8249db0 100644
> > --- a/drivers/firmware/arm_scmi/driver.c
> > +++ b/drivers/firmware/arm_scmi/driver.c
> > @@ -402,6 +402,16 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer)
> > return ret;
> > }
> >
> > +int scmi_do_xfer_again(const struct scmi_handle *handle, struct scmi_xfer *xfer)
> > +{
> > + struct scmi_info *info = handle_to_scmi_info(handle);
> > +
> > + xfer->rx.len = info->desc->max_msg_size;
>
> I am tempted to just have helper for above and use it where needed.
> Or may be I just don't like the name of the function, how about
> scmi_do_xfer_rxlen_reinit or anything else. Suggestions ?
I think a smoother way would be that scmi_do_xfer() initializes
both
xfer->rx.len = info->desc->max_msg_size
and
xfer->hdr.poll_completion = false
instead of doing that from scmi_xfer_get_init().
>
> > + xfer->hdr.poll_completion = false;
>
> Do we really need the above ?
I think so. Once a transfer is completed, poll_completion is true. But
the next transfer we expect should start assuming completion is not
yet done, hence this reset to false.
Regards,
Etienne
>
> --
> Regards,
> Sudeep
next prev parent reply other threads:[~2020-10-09 12:38 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-08 14:37 [PATCH 1/5] firmware: arm_scmi: always initialize protocols Etienne Carriere
2020-10-08 14:37 ` [PATCH 2/5] firmware: arm_scmi: fix transfer missing re-initialization Etienne Carriere
2020-10-08 21:18 ` Sudeep Holla
2020-10-09 12:38 ` Etienne Carriere [this message]
2020-10-09 15:20 ` Sudeep Holla
2020-10-12 14:17 ` [PATCH] firmware: arm_scmi: Add missing Rx size re-initialisation Sudeep Holla
2020-10-13 9:58 ` Etienne Carriere
2020-10-13 10:16 ` Sudeep Holla
2020-10-13 10:50 ` Sudeep Holla
2020-10-08 14:37 ` [PATCH 3/5] firmware: arm_scmi: add config dependency for smc transport Etienne Carriere
2020-10-08 21:08 ` Sudeep Holla
2020-10-09 12:33 ` Etienne Carriere
2020-10-09 15:58 ` Sudeep Holla
2020-10-12 10:11 ` Etienne Carriere
2020-10-08 14:37 ` [PATCH 4/5] firmware: arm_scmi: smc transport supports multi-message pool Etienne Carriere
2020-10-08 21:11 ` Sudeep Holla
2020-10-09 12:43 ` Etienne Carriere
2020-10-09 15:17 ` Sudeep Holla
2020-10-12 8:57 ` Sudeep Holla
2020-10-12 9:12 ` Etienne Carriere
2020-10-08 14:37 ` [PATCH 5/5] firmware: arm_scmi: fix ARCH_COLD_RESET Etienne Carriere
2020-10-08 21:16 ` Sudeep Holla
2020-10-08 19:17 ` [PATCH 1/5] firmware: arm_scmi: always initialize protocols Sudeep Holla
2020-10-09 12:31 ` Etienne Carriere
2020-10-09 16:31 ` Cristian Marussi
2020-10-12 9:32 ` Sudeep Holla
2020-10-13 10:45 ` Sudeep Holla
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