netdev - Re: [PATCH v5 19/19] clk: mediatek: Add MT8188 adsp clock support

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Date:   Thu, 9 Mar 2023 03:17:40 +0000
From:   Garmin Chang (張家銘) 
        <Garmin.Chang@...iatek.com>
To:     "wenst@...omium.org" <wenst@...omium.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v5 19/19] clk: mediatek: Add MT8188 adsp clock support

On Fri, 2023-02-03 at 15:39 +0800, Chen-Yu Tsai wrote:
> On Thu, Jan 19, 2023 at 9:02 PM Garmin.Chang <
> Garmin.Chang@...iatek.com> wrote:
> > 
> > Add MT8188 adsp clock controller which provides clock gate
> > control for Audio DSP.
> > 
> > Signed-off-by: Garmin.Chang <Garmin.Chang@...iatek.com>
> > ---
> >  drivers/clk/mediatek/Makefile                 |  2 +-
> >  .../clk/mediatek/clk-mt8188-adsp_audio26m.c   | 45
> > +++++++++++++++++++
> >  2 files changed, 46 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/clk/mediatek/clk-mt8188-adsp_audio26m.c
> > 
> > diff --git a/drivers/clk/mediatek/Makefile
> > b/drivers/clk/mediatek/Makefile
> > index 8befaedfdd3d..b56ae9bee1d8 100644
> > --- a/drivers/clk/mediatek/Makefile
> > +++ b/drivers/clk/mediatek/Makefile
> > @@ -89,7 +89,7 @@ obj-$(CONFIG_COMMON_CLK_MT8188) += clk-mt8188-
> > apmixedsys.o clk-mt8188-topckgen.o
> >                                    clk-mt8188-ipe.o clk-mt8188-
> > mfg.o clk-mt8188-vdec.o \
> >                                    clk-mt8188-vdo0.o clk-mt8188-
> > vdo1.o clk-mt8188-venc.o \
> >                                    clk-mt8188-vpp0.o clk-mt8188-
> > vpp1.o clk-mt8188-wpe.o \
> > -                                  clk-mt8188-imp_iic_wrap.o
> > +                                  clk-mt8188-imp_iic_wrap.o clk-
> > mt8188-adsp_audio26m.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192) += clk-mt8192.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192_AUDSYS) += clk-mt8192-aud.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192_CAMSYS) += clk-mt8192-cam.o
> > diff --git a/drivers/clk/mediatek/clk-mt8188-adsp_audio26m.c
> > b/drivers/clk/mediatek/clk-mt8188-adsp_audio26m.c
> > new file mode 100644
> > index 000000000000..f91381a1316c
> > --- /dev/null
> > +++ b/drivers/clk/mediatek/clk-mt8188-adsp_audio26m.c
> > @@ -0,0 +1,45 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +//
> > +// Copyright (c) 2022 MediaTek Inc.
> > +// Author: Garmin Chang <garmin.chang@...iatek.com>
> > +
> > +#include <linux/clk-provider.h>
> > +#include <linux/platform_device.h>
> > +#include <dt-bindings/clock/mediatek,mt8188-clk.h>
> > +
> > +#include "clk-gate.h"
> > +#include "clk-mtk.h"
> > +
> > +static const struct mtk_gate_regs adsp_audio26m_cg_regs = {
> > +       .set_ofs = 0x80,
> > +       .clr_ofs = 0x80,
> > +       .sta_ofs = 0x80,
> > +};
> > +
> > +#define GATE_ADSP_FLAGS(_id, _name, _parent, _shift)           \
> > +       GATE_MTK_FLAGS(_id, _name, _parent, &adsp_audio26m_cg_regs,
> > _shift,             \
> > +               &mtk_clk_gate_ops_no_setclr, CLK_IGNORE_UNUSED)
> 
> Why CLK_IGNORE_UNUSED?

Thank you for your review.

Because ADSP_INFRA is always on, it is unnecessary to add
CLK_IGNORE_UNUSED now.  I wiil remove it in v6. Please see commit

https://patchwork.kernel.org/project/linux-mediatek/patch/20221223080553.9397-3-Garmin.Chang@mediatek.com/

Add ignore_unused before to avoid "ADSP_INFRA is turned off". If
ADSP_INFRA is turned off, accessing registers will cause the system to
hang.