linux-kernel - Re: [PATCH v20 1/9] soc: cadence: Create helper functions for Cadence MHDP

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Message-ID: <rew4x4qxemig7rq4kossrn7cybihrgsizh43wnllgv2daf75gm@ziqsakm7gm56>
Date: Tue, 17 Dec 2024 13:07:02 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sandor Yu <Sandor.yu@....com>
Cc: andrzej.hajda@...el.com, neil.armstrong@...aro.org, 
	Laurent.pinchart@...asonboard.com, jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com, 
	daniel@...ll.ch, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, 
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com, vkoul@...nel.org, 
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, mripard@...nel.org, 
	kernel@...gutronix.de, linux-imx@....com, oliver.brown@....com, 
	alexander.stein@...tq-group.com, sam@...nborg.org
Subject: Re: [PATCH v20 1/9] soc: cadence: Create helper functions for
 Cadence MHDP

On Tue, Dec 17, 2024 at 02:51:43PM +0800, Sandor Yu wrote:
> Cadence MHDP IP includes a firmware. Driver and firmware communicate
> through a mailbox. The basic mailbox access functions in this patch
> are derived from the DRM bridge MHDP8546 driver.
> New mailbox access functions have been created based on different mailbox
> return values and security types, making them reusable across different
> MHDP driver versions and SOCs.
> 
> These helper fucntions will be reused in both the DRM bridge driver MDHP8501
> and the i.MX8MQ HDPTX PHY driver.
> 
> Six mailbox access helper functions are introduced.
> Three for non-secure mailbox access:
>  - cdns_mhdp_mailbox_send()
>  - cdns_mhdp_mailbox_send_recv()
>  - cdns_mhdp_mailbox_send_recv_multi()
> The other three for secure mailbox access:
>  - cdns_mhdp_secure_mailbox_send()
>  - cdns_mhdp_secure_mailbox_send_recv()
>  - cdns_mhdp_secure_mailbox_send_recv_multi()
> 
> All MHDP commands that need to be passed through the mailbox
> should be rewritten using these new helper functions.
> 
> The register read/write and DP DPCD read/write command functions
> are also included in this new helper driver.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> ---
> v19->v20:
> - new patch in v20.
>   The patch split from Patch #1 in v19 and move to a new folder drivers/soc/cadence

It makes it harder to review, but granted that we have already past
that, I think it's fine.

> 
> diff --git a/drivers/soc/cadence/Kconfig b/drivers/soc/cadence/Kconfig
> new file mode 100644
> index 0000000000000..b668790660fa5
> --- /dev/null
> +++ b/drivers/soc/cadence/Kconfig
> @@ -0,0 +1,9 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config CDNS_MHDP_HELPER
> +	tristate "Cadence MHDP Helper driver"

This symbol isn't supposed to be selected by the user. Please leave just
tristate without the menu entry text (the help text is fine, please keep
it).

LGTM otherwise.

> +	help
> +	  Enable Cadence MHDP helpers for mailbox, HDMI and DP.
> +	  This driver provides a foundational layer of mailbox communication for
> +	  various Cadence MHDP IP implementations, such as HDMI and DisplayPort.
> +

-- 
With best wishes
Dmitry