Re: [PATCH v3 7/7] clk: mediatek: mt8195: Add support for frequency hopping through FHCTL

[Chen-Yu Tsai <wenst@chromium.org>]

On Mon, Feb 6, 2023 at 6:01 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> wrote:
>
> Add FHCTL parameters and register PLLs through FHCTL to add support
> for frequency hopping and SSC. FHCTL will be enabled only on PLLs
> specified in devicetree.
>
> This commit brings functional changes only upon addition of
> devicetree configuration.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  drivers/clk/mediatek/clk-mt8195-apmixedsys.c | 69 +++++++++++++++++++-
>  1 file changed, 66 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mt8195-apmixedsys.c b/drivers/clk/mediatek/clk-mt8195-apmixedsys.c
> index 1bc917f2667e..c0db31ce0741 100644
> --- a/drivers/clk/mediatek/clk-mt8195-apmixedsys.c
> +++ b/drivers/clk/mediatek/clk-mt8195-apmixedsys.c
> @@ -3,9 +3,11 @@
>  // Copyright (c) 2021 MediaTek Inc.
>  // Author: Chun-Jie Chen <chun-jie.chen@mediatek.com>
>
> +#include "clk-fhctl.h"
>  #include "clk-gate.h"
>  #include "clk-mtk.h"
>  #include "clk-pll.h"
> +#include "clk-pllfh.h"
>
>  #include <dt-bindings/clock/mt8195-clk.h>
>  #include <linux/of_device.h>
> @@ -105,6 +107,61 @@ static const struct mtk_pll_data plls[] = {
>             0, 0, 22, 0x0158, 24, 0, 0, 0, 0x0158, 0, 0x0158, 0, 9),
>  };
>
> +enum fh_pll_id {
> +       FH_ARMPLL_LL,
> +       FH_ARMPLL_BL,
> +       FH_MEMPLL,
> +       FH_ADSPPLL,
> +       FH_NNAPLL,
> +       FH_CCIPLL,
> +       FH_MFGPLL,
> +       FH_TVDPLL2,
> +       FH_MPLL,
> +       FH_MMPLL,
> +       FH_MAINPLL,
> +       FH_MSDCPLL,
> +       FH_IMGPLL,
> +       FH_VDECPLL,
> +       FH_TVDPLL1,
> +       FH_NR_FH,
> +};
> +
> +#define FH(_pllid, _fhid, _offset) {                                   \
> +               .data = {                                               \
> +                       .pll_id = _pllid,                               \
> +                       .fh_id = _fhid,                                 \
> +                       .fh_ver = FHCTL_PLLFH_V2,                       \
> +                       .fhx_offset = _offset,                          \
> +                       .dds_mask = GENMASK(21, 0),                     \

> +                       .slope0_value = 0x6003c97,                      \
> +                       .slope1_value = 0x6003c97,                      \

Are these

> +                       .sfstrx_en = BIT(2),                            \
> +                       .frddsx_en = BIT(1),                            \
> +                       .fhctlx_en = BIT(0),                            \
> +                       .tgl_org = BIT(31),                             \
> +                       .dvfs_tri = BIT(31),                            \
> +                       .pcwchg = BIT(31),                              \

> +                       .dt_val = 0x0,                                  \
> +                       .df_val = 0x9,                                  \

and these just copied from MT8186?

> +                       .updnlmt_shft = 16,                             \
> +                       .msk_frddsx_dys = GENMASK(23, 20),              \
> +                       .msk_frddsx_dts = GENMASK(19, 16),              \
> +               },                                                      \
> +       }
> +
> +static struct mtk_pllfh_data pllfhs[] = {
> +       FH(CLK_APMIXED_ADSPPLL, FH_ADSPPLL, 0x78),
> +       FH(CLK_APMIXED_NNAPLL, FH_NNAPLL, 0x8c),
> +       FH(CLK_APMIXED_MFGPLL, FH_MFGPLL, 0xb4),
> +       FH(CLK_APMIXED_TVDPLL2, FH_TVDPLL2, 0xc8),
> +       FH(CLK_APMIXED_MMPLL, FH_MMPLL, 0xf0),
> +       FH(CLK_APMIXED_MAINPLL, FH_MAINPLL, 0x104),
> +       FH(CLK_APMIXED_MSDCPLL, FH_MSDCPLL, 0x118),
> +       FH(CLK_APMIXED_IMGPLL, FH_IMGPLL, 0x12c),
> +       FH(CLK_APMIXED_VDECPLL, FH_VDECPLL, 0x140),
> +       FH(CLK_APMIXED_TVDPLL2, FH_TVDPLL1, 0x154),
> +};
> +
>  static const struct of_device_id of_match_clk_mt8195_apmixed[] = {
>         { .compatible = "mediatek,mt8195-apmixedsys", },
>         {}
> @@ -114,13 +171,17 @@ static int clk_mt8195_apmixed_probe(struct platform_device *pdev)
>  {
>         struct clk_hw_onecell_data *clk_data;
>         struct device_node *node = pdev->dev.of_node;
> +       const u8 *fhctl_node = "mediatek,mt8195-fhctl";
>         int r;
>
>         clk_data = mtk_alloc_clk_data(CLK_APMIXED_NR_CLK);
>         if (!clk_data)
>                 return -ENOMEM;
>
> -       r = mtk_clk_register_plls(node, plls, ARRAY_SIZE(plls), clk_data);
> +       fhctl_parse_dt(fhctl_node, pllfhs, ARRAY_SIZE(pllfhs));
> +
> +       r = mtk_clk_register_pllfhs(node, plls, ARRAY_SIZE(plls),
> +                                   pllfhs, ARRAY_SIZE(pllfhs), clk_data);
>         if (r)
>                 goto free_apmixed_data;
>
> @@ -140,7 +201,8 @@ static int clk_mt8195_apmixed_probe(struct platform_device *pdev)
>  unregister_gates:
>         mtk_clk_unregister_gates(apmixed_clks, ARRAY_SIZE(apmixed_clks), clk_data);
>  unregister_plls:
> -       mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
> +       mtk_clk_unregister_pllfhs(plls, ARRAY_SIZE(plls), pllfhs,
> +                                 ARRAY_SIZE(pllfhs), clk_data);

Nit: I think this could be squeezed into one line.

>  free_apmixed_data:
>         mtk_free_clk_data(clk_data);
>         return r;
> @@ -153,7 +215,8 @@ static int clk_mt8195_apmixed_remove(struct platform_device *pdev)
>
>         of_clk_del_provider(node);
>         mtk_clk_unregister_gates(apmixed_clks, ARRAY_SIZE(apmixed_clks), clk_data);
> -       mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
> +       mtk_clk_unregister_pllfhs(plls, ARRAY_SIZE(plls), pllfhs,
> +                                 ARRAY_SIZE(pllfhs), clk_data);

Same here.

ChenYu

>         mtk_free_clk_data(clk_data);
>
>         return 0;
> --
> 2.39.1
>