linux-kernel - Re: [PATCH v2 10/19] clk: mediatek: Add MT8188 mfgcfg clock support

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Message-ID: <5e71c0b1-d645-1900-282d-df7d13cc60f8@collabora.com>
Date:   Thu, 27 Oct 2022 10:23:35 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     "Garmin.Chang" <Garmin.Chang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Richard Cochran <richardcochran@...il.com>
Cc:     Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 10/19] clk: mediatek: Add MT8188 mfgcfg clock support

Il 24/10/22 11:42, Garmin.Chang ha scritto:
> Add MT8188 mfg clock controller which provides clock gate
> control for GPU.
> 
> Signed-off-by: Garmin.Chang <Garmin.Chang@...iatek.com>
> ---
>   drivers/clk/mediatek/Makefile         |  2 +-
>   drivers/clk/mediatek/clk-mt8188-mfg.c | 50 +++++++++++++++++++++++++++
>   2 files changed, 51 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/clk/mediatek/clk-mt8188-mfg.c
> 
> diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
> index 21b05e880a3a..cd8870c28146 100644
> --- a/drivers/clk/mediatek/Makefile
> +++ b/drivers/clk/mediatek/Makefile
> @@ -85,7 +85,7 @@ obj-$(CONFIG_COMMON_CLK_MT8186) += clk-mt8186-mcu.o clk-mt8186-topckgen.o clk-mt
>   obj-$(CONFIG_COMMON_CLK_MT8188) += clk-mt8188-apmixedsys.o clk-mt8188-topckgen.o \
>   				   clk-mt8188-peri_ao.o clk-mt8188-infra_ao.o \
>   				   clk-mt8188-cam.o clk-mt8188-ccu.o clk-mt8188-img.o \
> -				   clk-mt8188-ipe.o
> +				   clk-mt8188-ipe.o clk-mt8188-mfg.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-mfg.c b/drivers/clk/mediatek/clk-mt8188-mfg.c
> new file mode 100644
> index 000000000000..3a75cd7443fd
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-mt8188-mfg.c
> @@ -0,0 +1,50 @@
> +// 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 mfgcfg_cg_regs = {
> +	.set_ofs = 0x4,
> +	.clr_ofs = 0x8,
> +	.sta_ofs = 0x0,
> +};
> +
> +#define GATE_MFGCFG(_id, _name, _parent, _shift)			\
> +	GATE_MTK(_id, _name, _parent, &mfgcfg_cg_regs, _shift, &mtk_clk_gate_ops_setclr)
> +
> +static const struct mtk_gate mfgcfg_clks[] = {
> +	GATE_MFGCFG(CLK_MFGCFG_BG3D, "mfgcfg_bg3d", "top_mfg_core_tmp", 0),
> +};

This will make it impossible to properly perform GPU DVFS.

Hint:

#define GATE_MFG(_id, _name, _parent, _shift)			\
	GATE_MTK_FLAGS(_id, _name, _parent, &mfg_cg_regs,	\
		       _shift, &mtk_clk_gate_ops_setclr,	\
		       CLK_SET_RATE_PARENT)

Regards,
Angelo