linux-kernel - Re: [PATCH v10 2/4] CMDQ: Mediatek CMDQ driver

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Date:	Fri, 15 Jul 2016 09:39:55 +0800
From:	Horng-Shyang Liao <hs.liao@...iatek.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	"Sascha Hauer" <s.hauer@...gutronix.de>,
	<devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	"Philipp Zabel" <p.zabel@...gutronix.de>,
	Nicolas Boichat <drinkcat@...omium.org>,
	"CK HU" <ck.hu@...iatek.com>, cawa cheng <cawa.cheng@...iatek.com>,
	Bibby Hsieh <bibby.hsieh@...iatek.com>,
	YT Shen <yt.shen@...iatek.com>,
	Daoyuan Huang <daoyuan.huang@...iatek.com>,
	Damon Chu <damon.chu@...iatek.com>,
	"Josh-YC Liu" <josh-yc.liu@...iatek.com>,
	Glory Hung <glory.hung@...iatek.com>,
	Jiaguang Zhang <jiaguang.zhang@...iatek.com>,
	Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
	Monica Wang <monica.wang@...iatek.com>, <hs.liao@...iatek.com>
Subject: Re: [PATCH v10 2/4] CMDQ: Mediatek CMDQ driver

Hi Paul,

On Thu, 2016-07-14 at 19:38 -0400, Paul Gortmaker wrote:
> On Thu, Jul 14, 2016 at 7:28 AM, HS Liao <hs.liao@...iatek.com> wrote:
> > This patch is first version of Mediatek Command Queue(CMDQ) driver. The
> > CMDQ is used to help write registers with critical time limitation,
> > such as updating display configuration during the vblank. It controls
> > Global Command Engine (GCE) hardware to achieve this requirement.
> > Currently, CMDQ only supports display related hardwares, but we expect
> > it can be extended to other hardwares for future requirements.
> >
> > Signed-off-by: HS Liao <hs.liao@...iatek.com>
> > Signed-off-by: CK Hu <ck.hu@...iatek.com>
> > ---
> >  drivers/soc/mediatek/Kconfig    |  11 +
> >  drivers/soc/mediatek/Makefile   |   1 +
> >  drivers/soc/mediatek/mtk-cmdq.c | 948 ++++++++++++++++++++++++++++++++++++++++
> >  include/soc/mediatek/cmdq.h     | 179 ++++++++
> >  4 files changed, 1139 insertions(+)
> >  create mode 100644 drivers/soc/mediatek/mtk-cmdq.c
> >  create mode 100644 include/soc/mediatek/cmdq.h
> >
> > diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> > index 0a4ea80..50869e4 100644
> > --- a/drivers/soc/mediatek/Kconfig
> > +++ b/drivers/soc/mediatek/Kconfig
> > @@ -1,6 +1,17 @@
> >  #
> >  # MediaTek SoC drivers
> >  #
> > +config MTK_CMDQ
> > +       bool "MediaTek CMDQ Support"
> > +       depends on ARM64 && ( ARCH_MEDIATEK || COMPILE_TEST )
> > +       select MAILBOX
> > +       select MTK_INFRACFG
> > +       help
> > +         Say yes here to add support for the MediaTek Command Queue (CMDQ)
> > +         driver. The CMDQ is used to help read/write registers with critical
> > +         time limitation, such as updating display configuration during the
> > +         vblank.
> > +
> >  config MTK_INFRACFG
> >         bool "MediaTek INFRACFG Support"
> >         depends on ARCH_MEDIATEK || COMPILE_TEST
> > diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
> > index 12998b0..f7397ef 100644
> > --- a/drivers/soc/mediatek/Makefile
> > +++ b/drivers/soc/mediatek/Makefile
> > @@ -1,3 +1,4 @@
> > +obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq.o
> >  obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
> >  obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
> >  obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
> > diff --git a/drivers/soc/mediatek/mtk-cmdq.c b/drivers/soc/mediatek/mtk-cmdq.c
> > new file mode 100644
> > index 0000000..d032603
> > --- /dev/null
> > +++ b/drivers/soc/mediatek/mtk-cmdq.c
> > @@ -0,0 +1,948 @@
> > +/*
> > + * Copyright (c) 2015 MediaTek Inc.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/bitops.h>
> > +#include <linux/clk.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/completion.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/errno.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/kernel.h>
> > +#include <linux/kthread.h>
> > +#include <linux/mailbox_client.h>
> > +#include <linux/mailbox_controller.h>
> > +#include <linux/module.h>
> 
> Please don't use module.h and MODULE_* stuff in a driver that has
> a bool Kconfig.  Either make it tristate if that has a sensible use case
> or get rid of the modular stuff.

Will remove it.

> Thanks,
> Paul.
> --

Thanks,
HS