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Date: Mon, 18 May 2020 19:52:29 +0200
From: Enric Balletbo i Serra <enric.balletbo@...labora.com>
To: Weiyi Lu <weiyi.lu@...iatek.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
Hi Weiyi,
On 15/5/20 5:35, Weiyi Lu wrote:
> 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.
>
It is fine to send a next version without changing the APIs, it depends on the
extra work if you are fine with the change. To be honest I didn't see the
problem above but I think can be fixed.
Cheers,
Enric
>>
>>>> .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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