Re: [PATCH 3/9] memory: mtk-smi: Use clk_bulk instead of the clk ops

From: Krzysztof Kozlowski
Date: Thu Jul 08 2021 - 05:32:26 EST

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On 16/06/2021 13:43, Yong Wu wrote:
> smi have many clocks: apb/smi/gals.
> This patch use clk_bulk interface instead of the orginal one to simply
> the code.
>
> gals is optional clk(some larbs may don't have gals). use clk_bulk_optional
> instead. and then remove the has_gals flag.
>
> Also remove clk fail logs since bulk interface already output fail log.
>
> Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
> ---
> drivers/memory/mtk-smi.c | 124 +++++++++++----------------------------
> 1 file changed, 34 insertions(+), 90 deletions(-)
>
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index c5fb51f73b34..bcd2bf130655 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -60,9 +60,18 @@ enum mtk_smi_gen {
> MTK_SMI_GEN2
> };
>
> +#define MTK_SMI_CLK_NR_MAX 4
> +
> +static const char * const mtk_smi_common_clocks[] = {
> + "apb", "smi", "gals0", "gals1", /* glas is optional */

Typo here - glas.

> +};
> +
> +static const char * const mtk_smi_larb_clocks[] = {
> + "apb", "smi", "gals"
> +};
> +
> struct mtk_smi_common_plat {
> enum mtk_smi_gen gen;
> - bool has_gals;
> u32 bus_sel; /* Balance some larbs to enter mmu0 or mmu1 */
> };
>
> @@ -70,13 +79,12 @@ struct mtk_smi_larb_gen {
> int port_in_larb[MTK_LARB_NR_MAX + 1];
> void (*config_port)(struct device *dev);
> unsigned int larb_direct_to_common_mask;
> - bool has_gals;
> };
>
> struct mtk_smi {
> struct device *dev;
> - struct clk *clk_apb, *clk_smi;
> - struct clk *clk_gals0, *clk_gals1;
> + unsigned int clk_num;
> + struct clk_bulk_data clks[MTK_SMI_CLK_NR_MAX];
> struct clk *clk_async; /*only needed by mt2701*/
> union {
> void __iomem *smi_ao_base; /* only for gen1 */
> @@ -95,45 +103,6 @@ struct mtk_smi_larb { /* larb: local arbiter */
> unsigned char *bank;
> };
>
> -static int mtk_smi_clk_enable(const struct mtk_smi *smi)
> -{
> - int ret;
> -
> - ret = clk_prepare_enable(smi->clk_apb);
> - if (ret)
> - return ret;
> -
> - ret = clk_prepare_enable(smi->clk_smi);
> - if (ret)
> - goto err_disable_apb;
> -
> - ret = clk_prepare_enable(smi->clk_gals0);
> - if (ret)
> - goto err_disable_smi;
> -
> - ret = clk_prepare_enable(smi->clk_gals1);
> - if (ret)
> - goto err_disable_gals0;
> -
> - return 0;
> -
> -err_disable_gals0:
> - clk_disable_unprepare(smi->clk_gals0);
> -err_disable_smi:
> - clk_disable_unprepare(smi->clk_smi);
> -err_disable_apb:
> - clk_disable_unprepare(smi->clk_apb);
> - return ret;
> -}
> -
> -static void mtk_smi_clk_disable(const struct mtk_smi *smi)
> -{
> - clk_disable_unprepare(smi->clk_gals1);
> - clk_disable_unprepare(smi->clk_gals0);
> - clk_disable_unprepare(smi->clk_smi);
> - clk_disable_unprepare(smi->clk_apb);
> -}
> -
> int mtk_smi_larb_get(struct device *larbdev)
> {
> int ret = pm_runtime_resume_and_get(larbdev);
> @@ -270,7 +239,6 @@ static const struct mtk_smi_larb_gen mtk_smi_larb_mt6779 = {
> };
>
> static const struct mtk_smi_larb_gen mtk_smi_larb_mt8183 = {
> - .has_gals = true,
> .config_port = mtk_smi_larb_config_port_gen2_general,
> .larb_direct_to_common_mask = BIT(2) | BIT(3) | BIT(7),
> /* IPU0 | IPU1 | CCU */
> @@ -320,6 +288,7 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
> struct device_node *smi_node;
> struct platform_device *smi_pdev;
> struct device_link *link;
> + int i, ret;
>
> larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
> if (!larb)
> @@ -331,22 +300,14 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
> if (IS_ERR(larb->base))
> return PTR_ERR(larb->base);
>
> - larb->smi.clk_apb = devm_clk_get(dev, "apb");
> - if (IS_ERR(larb->smi.clk_apb))
> - return PTR_ERR(larb->smi.clk_apb);
> -
> - larb->smi.clk_smi = devm_clk_get(dev, "smi");
> - if (IS_ERR(larb->smi.clk_smi))
> - return PTR_ERR(larb->smi.clk_smi);
> -
> - if (larb->larb_gen->has_gals) {
> - /* The larbs may still haven't gals even if the SoC support.*/
> - larb->smi.clk_gals0 = devm_clk_get(dev, "gals");
> - if (PTR_ERR(larb->smi.clk_gals0) == -ENOENT)
> - larb->smi.clk_gals0 = NULL;
> - else if (IS_ERR(larb->smi.clk_gals0))
> - return PTR_ERR(larb->smi.clk_gals0);
> - }
> + larb->smi.clk_num = ARRAY_SIZE(mtk_smi_larb_clocks);
> + for (i = 0; i < larb->smi.clk_num; i++)
> + larb->smi.clks[i].id = mtk_smi_larb_clocks[i];
> +
> + ret = devm_clk_bulk_get_optional(dev, larb->smi.clk_num, larb->smi.clks);
> + if (ret)
> + return ret;
> +
> larb->smi.dev = dev;
>
> smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
> @@ -391,11 +352,9 @@ static int __maybe_unused mtk_smi_larb_resume(struct device *dev)
> const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
> int ret;
>
> - ret = mtk_smi_clk_enable(&larb->smi);
> - if (ret < 0) {
> - dev_err(dev, "Failed to enable clock(%d).\n", ret);
> + ret = clk_bulk_prepare_enable(larb->smi.clk_num, larb->smi.clks);
> + if (ret < 0)
> return ret;
> - }
>
> /* Configure the basic setting for this larb */
> larb_gen->config_port(dev);
> @@ -407,7 +366,7 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
> {
> struct mtk_smi_larb *larb = dev_get_drvdata(dev);
>
> - mtk_smi_clk_disable(&larb->smi);
> + clk_bulk_disable_unprepare(larb->smi.clk_num, larb->smi.clks);
> return 0;
> }
>
> @@ -437,21 +396,18 @@ static const struct mtk_smi_common_plat mtk_smi_common_gen2 = {
>
> static const struct mtk_smi_common_plat mtk_smi_common_mt6779 = {
> .gen = MTK_SMI_GEN2,
> - .has_gals = true,
> .bus_sel = F_MMU1_LARB(1) | F_MMU1_LARB(2) | F_MMU1_LARB(4) |
> F_MMU1_LARB(5) | F_MMU1_LARB(6) | F_MMU1_LARB(7),
> };
>
> static const struct mtk_smi_common_plat mtk_smi_common_mt8183 = {
> .gen = MTK_SMI_GEN2,
> - .has_gals = true,
> .bus_sel = F_MMU1_LARB(1) | F_MMU1_LARB(2) | F_MMU1_LARB(5) |
> F_MMU1_LARB(7),
> };
>
> static const struct mtk_smi_common_plat mtk_smi_common_mt8192 = {
> .gen = MTK_SMI_GEN2,
> - .has_gals = true,
> .bus_sel = F_MMU1_LARB(1) | F_MMU1_LARB(2) | F_MMU1_LARB(5) |
> F_MMU1_LARB(6),
> };
> @@ -493,7 +449,7 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct mtk_smi *common;
> struct resource *res;
> - int ret;
> + int i, ret;
>
> common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
> if (!common)
> @@ -501,23 +457,13 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
> common->dev = dev;
> common->plat = of_device_get_match_data(dev);
>
> - common->clk_apb = devm_clk_get(dev, "apb");
> - if (IS_ERR(common->clk_apb))
> - return PTR_ERR(common->clk_apb);
> -
> - common->clk_smi = devm_clk_get(dev, "smi");
> - if (IS_ERR(common->clk_smi))
> - return PTR_ERR(common->clk_smi);
> + common->clk_num = ARRAY_SIZE(mtk_smi_common_clocks);
> + for (i = 0; i < common->clk_num; i++)
> + common->clks[i].id = mtk_smi_common_clocks[i];
>
> - if (common->plat->has_gals) {
> - common->clk_gals0 = devm_clk_get(dev, "gals0");
> - if (IS_ERR(common->clk_gals0))
> - return PTR_ERR(common->clk_gals0);
> -
> - common->clk_gals1 = devm_clk_get(dev, "gals1");
> - if (IS_ERR(common->clk_gals1))
> - return PTR_ERR(common->clk_gals1);
> - }
> + ret = devm_clk_bulk_get_optional(dev, common->clk_num, common->clks);
> + if (ret)
> + return ret;

How do you handle now missing required clocks?

>
> /*
> * for mtk smi gen 1, we need to get the ao(always on) base to config
> @@ -561,11 +507,9 @@ static int __maybe_unused mtk_smi_common_resume(struct device *dev)
> u32 bus_sel = common->plat->bus_sel;
> int ret;
>
> - ret = mtk_smi_clk_enable(common);
> - if (ret) {
> - dev_err(common->dev, "Failed to enable clock(%d).\n", ret);
> + ret = clk_bulk_prepare_enable(common->clk_num, common->clks);
> + if (ret)
> return ret;
> - }
>
> if (common->plat->gen == MTK_SMI_GEN2 && bus_sel)
> writel(bus_sel, common->base + SMI_BUS_SEL);
> @@ -576,7 +520,7 @@ static int __maybe_unused mtk_smi_common_suspend(struct device *dev)
> {
> struct mtk_smi *common = dev_get_drvdata(dev);
>
> - mtk_smi_clk_disable(common);
> + clk_bulk_disable_unprepare(common->clk_num, common->clks);
> return 0;
> }
>
>

Best regards,
Krzysztof

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Previous message: Yajun Deng: "[PATCH v2] net: rtnetlink: Fix rtnl_dereference may be return NULL"
Next in thread: Yong Wu: "Re: [PATCH 3/9] memory: mtk-smi: Use clk_bulk instead of the clk ops"
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