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Date: Fri, 15 May 2020 11:35:24 +0800
From: Weiyi Lu <weiyi.lu@...iatek.com>
To: Enric Balletbo i Serra <enric.balletbo@...labora.com>
CC: Enric Balletbo Serra <eballetbo@...il.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Nicolas Boichat <drinkcat@...omium.org>,
"Rob Herring" <robh@...nel.org>,
Sascha Hauer <kernel@...gutronix.de>,
James Liao <jamesjj.liao@...iatek.com>,
<srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
Fan Chen <fan.chen@...iatek.com>,
<linux-mediatek@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v14 03/11] soc: mediatek: Add basic_clk_name to
scp_power_data
On Mon, 2020-05-11 at 14:02 +0800, Weiyi Lu wrote:
> On Wed, 2020-05-06 at 23:01 +0200, Enric Balletbo i Serra wrote:
> > Hi Weiyi,
> >
> > Thank you for your patch.
> >
> > On 6/5/20 10:15, Weiyi Lu wrote:
> > > Try to stop extending the clk_id or clk_names if there are
> > > more and more new BASIC clocks. To get its own clocks by the
> > > basic_clk_name of each power domain.
> > > And then use basic_clk_name strings for all compatibles, instead of
> > > mixing clk_id and clk_name.
> > >
> > > Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
> > > Reviewed-by: Nicolas Boichat <drinkcat@...omium.org>
> > > ---
> > > drivers/soc/mediatek/mtk-scpsys.c | 134 ++++++++++++--------------------------
> > > 1 file changed, 41 insertions(+), 93 deletions(-)
> > >
> > > diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> > > index f669d37..c9c3cf7 100644
> > > --- a/drivers/soc/mediatek/mtk-scpsys.c
> > > +++ b/drivers/soc/mediatek/mtk-scpsys.c
> > > @@ -78,34 +78,6 @@
> > > #define PWR_STATUS_HIF1 BIT(26) /* MT7622 */
> > > #define PWR_STATUS_WB BIT(27) /* MT7622 */
> > >
> > > -enum clk_id {
> > > - CLK_NONE,
> > > - CLK_MM,
> > > - CLK_MFG,
> > > - CLK_VENC,
> > > - CLK_VENC_LT,
> > > - CLK_ETHIF,
> > > - CLK_VDEC,
> > > - CLK_HIFSEL,
> > > - CLK_JPGDEC,
> > > - CLK_AUDIO,
> > > - CLK_MAX,
> > > -};
> > > -
> > > -static const char * const clk_names[] = {
> > > - NULL,
> > > - "mm",
> > > - "mfg",
> > > - "venc",
> > > - "venc_lt",
> > > - "ethif",
> > > - "vdec",
> > > - "hif_sel",
> > > - "jpgdec",
> > > - "audio",
> > > - NULL,
> > > -};
> > > -
> > > #define MAX_CLKS 3
> > >
> > > /**
> > > @@ -116,7 +88,7 @@ enum clk_id {
> > > * @sram_pdn_bits: The mask for sram power control bits.
> > > * @sram_pdn_ack_bits: The mask for sram power control acked bits.
> > > * @bus_prot_mask: The mask for single step bus protection.
> > > - * @clk_id: The basic clocks required by this power domain.
> > > + * @basic_clk_name: The basic clocks required by this power domain.
> > > * @caps: The flag for active wake-up action.
> > > */
> > > struct scp_domain_data {
> > > @@ -126,7 +98,7 @@ struct scp_domain_data {
> > > u32 sram_pdn_bits;
> > > u32 sram_pdn_ack_bits;
> > > u32 bus_prot_mask;
> > > - enum clk_id clk_id[MAX_CLKS];
> > > + const char *basic_clk_name[MAX_CLKS];
> >
> > I only reviewed v13, so sorry if this was already discussed. I am wondering if
> > would be better take advantage of the devm_clk_bulk_get() function instead of
> > kind of reimplementing the same, something like this
> >
> > const struct clk_bulk_data *basic_clocks;
> >
>
> I thought it should be const struct clk_bulk_data
> basic_clocks[MAX_CLKS]; instead of const struct clk_bulk_data
> *basic_clocks; in struct scp_domain_data data type
>
> > > u8 caps;
> > > };
> > >
> > > @@ -411,12 +383,19 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> > > return ret;
> > > }
> > >
> > > -static void init_clks(struct platform_device *pdev, struct clk **clk)
> > > +static int init_basic_clks(struct platform_device *pdev, struct clk **clk,
> > > + const char * const *name)
> > > {
> > > int i;
> > >
> > > - for (i = CLK_NONE + 1; i < CLK_MAX; i++)
> > > - clk[i] = devm_clk_get(&pdev->dev, clk_names[i]);
> > > + for (i = 0; i < MAX_CLKS && name[i]; i++) {
> > > + clk[i] = devm_clk_get(&pdev->dev, name[i]);
> > > +
> > > + if (IS_ERR(clk[i]))
> > > + return PTR_ERR(clk[i]);
> > > + }
> >
> > You will be able to remove this function, see below ...
> >
> > > +
> > > + return 0;
> > > }
> > >
> > > static struct scp *init_scp(struct platform_device *pdev,
> > > @@ -426,9 +405,8 @@ static struct scp *init_scp(struct platform_device *pdev,
> > > {
> > > struct genpd_onecell_data *pd_data;
> > > struct resource *res;
> > > - int i, j;
> > > + int i, ret;
> > > struct scp *scp;
> > > - struct clk *clk[CLK_MAX];
> > >
> > > scp = devm_kzalloc(&pdev->dev, sizeof(*scp), GFP_KERNEL);
> > > if (!scp)
> > > @@ -481,8 +459,6 @@ static struct scp *init_scp(struct platform_device *pdev,
> > >
> > > pd_data->num_domains = num;
> > >
> > > - init_clks(pdev, clk);
> > > -
> > > for (i = 0; i < num; i++) {
> > > struct scp_domain *scpd = &scp->domains[i];
> > > struct generic_pm_domain *genpd = &scpd->genpd;
> > > @@ -493,17 +469,9 @@ static struct scp *init_scp(struct platform_device *pdev,
> > >
> > > scpd->data = data;
> > >
> > > - for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) {
> > > - struct clk *c = clk[data->clk_id[j]];
> > > -
> > > - if (IS_ERR(c)) {
> > > - dev_err(&pdev->dev, "%s: clk unavailable\n",
> > > - data->name);
> > > - return ERR_CAST(c);
> > > - }
> > > -
> > > - scpd->clk[j] = c;
> > > - }
> > > + ret = init_basic_clks(pdev, scpd->clk, data->basic_clk_name);
> > > + if (ret)
> > > + return ERR_PTR(ret);
> >
> > Just call:
> >
> > ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(basic_clocks),
> > data->basic_clocks);
> > if (ret)
> > return ERR_PTR(ret);
> >
> > >
> > > genpd->name = data->name;
> > > genpd->power_off = scpsys_power_off;
> > > @@ -560,7 +528,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> > > .ctl_offs = SPM_CONN_PWR_CON,
> > > .bus_prot_mask = MT2701_TOP_AXI_PROT_EN_CONN_M |
> > > MT2701_TOP_AXI_PROT_EN_CONN_S,
> > > - .clk_id = {CLK_NONE},
> > > .caps = MTK_SCPD_ACTIVE_WAKEUP,
> > > },
> > > [MT2701_POWER_DOMAIN_DISP] = {
> > > @@ -568,7 +535,7 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> > > .sta_mask = PWR_STATUS_DISP,
> > > .ctl_offs = SPM_DIS_PWR_CON,
> > > .sram_pdn_bits = GENMASK(11, 8),
> > > - .clk_id = {CLK_MM},
> > > + .basic_clk_name = {"mm"},
> >
> > .basic_clocks[] = {
> > { .id = "mm" },
> > };
> >
>
> Those basic clocks without given a name (name: null) would get incorrect
> clock via clk_bulk_get(...) due to
>
> /**
> * of_parse_clkspec() - Parse a DT clock specifier for a given device
> node
> * @np: device node to parse clock specifier from
> * @index: index of phandle to parse clock out of. If index < 0, @name
> is used
> * @name: clock name to find and parse. If name is NULL, the index is
> used
>
> And the index is 0 here in this callstack
>
> I guess something need to be improved before we use the clk_bulk_ APIs.
>
Hi Enric,
According to the result above, is it necessary to change the APIs or
maybe I should send the next version v15 first to fix other problems you
mentioned? Many thanks.
>
> > > .bus_prot_mask = MT2701_TOP_AXI_PROT_EN_MM_M0,
> > > .caps = MTK_SCPD_ACTIVE_WAKEUP,
> > > },
> > > @@ -578,7 +545,7 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> > > .ctl_offs = SPM_MFG_PWR_CON,
> > > .sram_pdn_bits = GENMASK(11, 8),
> > > .sram_pdn_ack_bits = GENMASK(12, 12),
> > > - .clk_id = {CLK_MFG},
> > > + .basic_clk_name = {"mfg"},
> >
> > .basic_clocks[] = {
> > { .id = "mfg" },
> > };
> >
> > > .caps = MTK_SCPD_ACTIVE_WAKEUP,
> > > },
> > > [MT2701_POWER_DOMAIN_VDEC] = {
> > > @@ -587,7 +554,7 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> > > .ctl_offs = SPM_VDE_PWR_CON,
> > > .sram_pdn_bits = GENMASK(11, 8),
> > > .sram_pdn_ack_bits = GENMASK(12, 12),
> > > - .clk_id = {CLK_MM},
> > > + .basic_clk_name = {"mm"},
> >
> > ...
> >
> > [snip]
>
>
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