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Tue, 4 May 2021 10:31:05 +0000 Subject: Re: [PATCH V2 3/4] soc: imx: Add generic blk-ctl driver To: Lucas Stach , robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, p.zabel@pengutronix.de, krzk@kernel.org, agx@sigxcpu.org, marex@denx.de, andrew.smirnov@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ping.bai@nxp.com, frieder.schrempf@kontron.de, aford173@gmail.com, abel.vesa@nxp.com, Peng Fan References: <20210430052746.10815-1-peng.fan@oss.nxp.com> <20210430052746.10815-4-peng.fan@oss.nxp.com> <6997abd422ffa1fa384a048552109aec1095abc3.camel@pengutronix.de> From: "Peng Fan (OSS)" Message-ID: <1707a917-5f91-b3e8-2be1-6461fb4c950c@oss.nxp.com> Date: Tue, 4 May 2021 18:30:52 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 In-Reply-To: <6997abd422ffa1fa384a048552109aec1095abc3.camel@pengutronix.de> Content-Type: text/plain; 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>> +} >> + >> +static int imx_blk_ctl_enable_hsk(struct device *dev) >> +{ >> + struct imx_blk_ctl *blk_ctl = dev_get_drvdata(dev); >> + const struct imx_blk_ctl_hw *hw = &blk_ctl->dev_data->hw_hsk; >> + struct regmap *regmap = blk_ctl->regmap; >> + int ret; >> + >> + >> + if (hw->flags & IMX_BLK_CTL_PD_RESET) >> + ret = regmap_update_bits(regmap, hw->rst_offset, hw->rst_mask, hw->rst_mask); >> + >> + ret = regmap_update_bits(regmap, hw->offset, hw->mask, hw->mask); >> + >> + /* Wait for handshake */ >> + udelay(5); >> + >> + return ret; >> +} >> + >> +int imx_blk_ctl_power_off(struct generic_pm_domain *domain) >> +{ >> + struct imx_blk_ctl_domain *pd; >> + struct imx_blk_ctl *blk_ctl; >> + const struct imx_blk_ctl_hw *hw; >> + struct regmap *regmap; >> + int ret; >> + >> + pd = to_imx_blk_ctl_pd(domain); >> + blk_ctl = pd->blk_ctl; >> + regmap = blk_ctl->regmap; >> + hw = &blk_ctl->dev_data->pds[pd->id]; >> + >> + ret = clk_bulk_prepare_enable(blk_ctl->num_clks, blk_ctl->clks); >> + if (ret) >> + return ret; > > This looks a bit strange to me. Does that mean that you keep all the > CCM clocks going into the blkctl enabled as long as one of the blkctl > virtual power domains is up? No. The clocks are disable unprepared when this function finish. The clocks are only used for setting blk ctl bits and handshake. I would have expected each virtual PD to > have a list of clock names that need to be enabled, to make this more > selective. > > I haven't completely thought it through if this is a problem, but I > could see some CCM PLLs running without a reason if all CCM clocks are > kept enabled. This surely is something we want to avoid from a pwoer > consumption PoV. I thought to add selective clocks for each virtual PD, but that makes the design completed, and the clocks(gate) are only enabled for a little while, so I think compared with the software complexity, the little benifit of power could be ignored? > >> + >> + ret = regmap_update_bits(regmap, hw->offset, hw->mask, 0); >> + if (ret) >> + goto hsk_fail; >> + >> + if (hw->flags & IMX_BLK_CTL_PD_RESET) >> + ret = regmap_update_bits(regmap, hw->rst_offset, hw->rst_mask, 0); >> + >> + if (atomic_dec_and_test(&blk_ctl->power_count)) { >> + ret = imx_blk_ctl_enable_hsk(blk_ctl->dev); >> + if (ret) { >> + dev_err(blk_ctl->dev, "Hankshake fail\n"); >> + goto hsk_fail; >> + } >> + } >> + >> +hsk_fail: >> + clk_bulk_disable_unprepare(blk_ctl->num_clks, blk_ctl->clks); >> + >> + return ret; >> +} >> + >> +int imx_blk_ctl_power_on(struct generic_pm_domain *domain) >> +{ >> + struct imx_blk_ctl_domain *pd; >> + struct regmap *regmap; >> + const struct imx_blk_ctl_hw *hw; >> + int ret; >> + struct imx_blk_ctl *blk_ctl; >> + >> + pd = to_imx_blk_ctl_pd(domain); >> + blk_ctl = pd->blk_ctl; >> + regmap = blk_ctl->regmap; >> + hw = &blk_ctl->dev_data->pds[pd->id]; >> + >> + ret = clk_bulk_prepare_enable(blk_ctl->num_clks, blk_ctl->clks); >> + if (ret) >> + return ret; >> + >> + if ((atomic_read(&blk_ctl->power_count) == 0)) { >> + ret = imx_blk_ctl_enable_hsk(blk_ctl->dev); >> + if (ret) { >> + dev_err(blk_ctl->dev, "Hankshake fail\n"); >> + goto disable_clk; >> + } >> + } > > This is bogus. The variable isn't used as a atomic, if at all this > should use atomic_inc_return, but I think even that isn't correct in > that case. imx_blk_ctl_enable_hsk() includes a wait time, so if two > paths call this function at the same time, the second caller would be > able to overtake the first one, which is still waiting for the > handshake to complete, effectively skipping the handshake. This needs a > proper lock, as this function isn't called from a performance critical > path it makes no sense to try to optimize this with an atomic counter, > rather than going with a mutex. I see. Will use a mutex here. > >> + >> + if (hw->flags & IMX_BLK_CTL_PD_RESET) >> + ret = regmap_update_bits(regmap, hw->rst_offset, hw->rst_mask, 0); >> + >> + /* Wait for reset propagate */ >> + udelay(5); >> + >> + if (hw->flags & IMX_BLK_CTL_PD_RESET) >> + ret = regmap_update_bits(regmap, hw->rst_offset, hw->rst_mask, hw->rst_mask); >> + >> + ret = regmap_update_bits(regmap, hw->offset, hw->mask, hw->mask); >> + if (ret) >> + goto disable_clk; >> + >> + atomic_inc(&blk_ctl->power_count); >> + >> +disable_clk: >> + clk_bulk_disable_unprepare(blk_ctl->num_clks, blk_ctl->clks); >> + >> + return ret; >> +} >> + >> +static int imx_blk_ctl_attach_pd(struct device *dev, struct device **devs, char **pd_names, >> + u32 num_pds) >> +{ >> + int i, ret; >> + >> + if (!pd_names) >> + return 0; >> + >> + if (dev->pm_domain) { >> + devs[0] = dev; >> + pm_runtime_enable(dev); >> + return 0; >> + } >> + >> + for (i = 0; i < num_pds; i++) { >> + devs[i] = dev_pm_domain_attach_by_name(dev, pd_names[i]); >> + if (IS_ERR_OR_NULL(devs[i])) { >> + ret = PTR_ERR(devs[i]) ? : -ENODATA; >> + goto detach_pm; >> + } >> + } >> + >> + return 0; >> + >> +detach_pm: >> + for (i--; i >= 0; i--) >> + dev_pm_domain_detach(devs[i], false); >> + >> + return ret; >> +} >> + >> +static int imx_blk_ctl_register_pd(struct device *dev) >> +{ >> + struct imx_blk_ctl *blk_ctl = dev_get_drvdata(dev); >> + const struct imx_blk_ctl_dev_data *dev_data = blk_ctl->dev_data; >> + int num = dev_data->pds_num; >> + struct imx_blk_ctl_domain *domain; >> + int i, ret; >> + >> + blk_ctl->onecell_data.num_domains = num; >> + blk_ctl->onecell_data.domains = devm_kcalloc(dev, num, >> + sizeof(struct generic_pm_domain *), >> + GFP_KERNEL); >> + >> + if (!blk_ctl->onecell_data.domains) >> + return -ENOMEM; >> + >> + for (i = 0; i < num; i++) { >> + domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL); >> + if (!domain) { >> + ret = -ENOMEM; >> + goto remove_genpd; >> + } >> + domain->pd.name = dev_data->pds[i].name; >> + domain->pd.power_off = imx_blk_ctl_power_off; >> + domain->pd.power_on = imx_blk_ctl_power_on; >> + domain->blk_ctl = blk_ctl; >> + domain->id = i; >> + >> + ret = pm_genpd_init(&domain->pd, NULL, true); >> + if (ret) >> + return ret; >> + >> + blk_ctl->onecell_data.domains[i] = &domain->pd; >> + } >> + >> + return 0; >> + >> +remove_genpd: >> + for (i = i - 1; i >= 0; i--) >> + pm_genpd_remove(blk_ctl->onecell_data.domains[i]); >> + >> + return ret; >> +} >> + >> +static int imx_blk_ctl_hook_pd(struct device *dev) >> +{ >> + struct imx_blk_ctl *blk_ctl = dev_get_drvdata(dev); >> + const struct imx_blk_ctl_dev_data *dev_data = blk_ctl->dev_data; >> + const struct imx_blk_ctl_hw *pds = dev_data->pds; >> + int num_active_pd = dev_data->num_active_pd; >> + int num = dev_data->pds_num; >> + struct generic_pm_domain *genpd, *child_genpd; >> + int ret; >> + int i, j; >> + >> + blk_ctl->active_pds = devm_kcalloc(dev, num_active_pd, sizeof(struct device *), GFP_KERNEL); >> + if (!blk_ctl->active_pds) >> + return -ENOMEM; >> + >> + ret = imx_blk_ctl_attach_pd(dev, blk_ctl->active_pds, dev_data->active_pd_names, >> + num_active_pd); >> + if (ret) { >> + if (ret == -EPROBE_DEFER) >> + return ret; >> + dev_err(dev, "Failed to attach active pd: %d\n", ret); >> + return ret; >> + } >> + >> + for (i = 0; i < num; i++) { >> + for (j = 0; j < num_active_pd; j++) { >> + genpd = pd_to_genpd(blk_ctl->active_pds[j]->pm_domain); >> + if (!strcmp(genpd->name, pds[i].parent_name)) >> + break; >> + } >> + >> + child_genpd = blk_ctl->onecell_data.domains[i]; >> + if (pm_genpd_add_subdomain(genpd, child_genpd)) >> + pr_warn("failed to add subdomain:\n"); >> + } >> + >> + return 0; >> +} >> + >> +int imx_blk_ctl_register(struct device *dev) >> +{ >> + struct imx_blk_ctl *blk_ctl = dev_get_drvdata(dev); >> + const struct imx_blk_ctl_dev_data *dev_data = blk_ctl->dev_data; >> + int num = dev_data->pds_num; >> + int i, ret; >> + >> + if (!blk_ctl) >> + return -ENODEV; >> + >> + ret = imx_blk_ctl_register_pd(dev); >> + if (ret) >> + return ret; >> + >> + ret = imx_blk_ctl_hook_pd(dev); >> + if (ret) >> + goto unregister_pd; >> + >> + ret = of_genpd_add_provider_onecell(dev->of_node, &blk_ctl->onecell_data); >> + if (ret) >> + goto detach_pd; >> + >> + pm_runtime_get_noresume(dev); >> + pm_runtime_set_active(dev); >> + pm_runtime_enable(dev); >> + >> + pm_runtime_put(dev); >> + >> + return 0; >> + >> +detach_pd: >> + for (i = blk_ctl->dev_data->num_active_pd; i >= 0; i--) >> + dev_pm_domain_detach(blk_ctl->active_pds[i], false); >> +unregister_pd: >> + for (i = num - 1; i >= 0; i--) >> + pm_genpd_remove(blk_ctl->onecell_data.domains[i]); >> + >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(imx_blk_ctl_register); >> + >> +static int __maybe_unused imx_blk_ctl_runtime_suspend(struct device *dev) >> +{ >> + return 0; >> +} >> + >> +static int __maybe_unused imx_blk_ctl_runtime_resume(struct device *dev) >> +{ >> + return 0; >> +} > > Why those empty stubs? If you don't need to do anything for > suspend/resume, just don't add the functions. ok, will drop in V3. Thanks, Peng. > >> + >> +const struct dev_pm_ops imx_blk_ctl_pm_ops = { >> + SET_RUNTIME_PM_OPS(imx_blk_ctl_runtime_suspend, >> + imx_blk_ctl_runtime_resume, NULL) >> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, >> + pm_runtime_force_resume) >> +}; >> +EXPORT_SYMBOL_GPL(imx_blk_ctl_pm_ops); >> diff --git a/drivers/soc/imx/blk-ctl.h b/drivers/soc/imx/blk-ctl.h >> new file mode 100644 >> index 000000000000..e736369406a1 >> --- /dev/null >> +++ b/drivers/soc/imx/blk-ctl.h >> @@ -0,0 +1,76 @@ >> +/* SPDX-License-Identifier: GPL-2.0 */ >> +#ifndef __SOC_IMX_BLK_CTL_H >> +#define __SOC_IMX_BLK_CTL_H >> + >> +enum imx_blk_ctl_pd_type { >> + BLK_CTL_PD, >> +}; >> + >> +struct imx_blk_ctl_hw { >> + int type; >> + char *name; >> + char *parent_name; >> + u32 offset; >> + u32 mask; >> + u32 flags; >> + u32 id; >> + u32 rst_offset; >> + u32 rst_mask; >> +}; >> + >> +struct imx_blk_ctl_domain { >> + struct generic_pm_domain pd; >> + struct imx_blk_ctl *blk_ctl; >> + u32 id; >> +}; >> + >> +struct imx_blk_ctl_dev_data { >> + struct regmap_config config; >> + struct imx_blk_ctl_hw *pds; >> + struct imx_blk_ctl_hw hw_hsk; >> + u32 pds_num; >> + char **active_pd_names; >> + u32 num_active_pd; >> +}; >> + >> +struct imx_blk_ctl { >> + struct device *dev; >> + struct regmap *regmap; >> + struct device **active_pds; >> + u32 pds_num; >> + u32 active_pd_count; >> + struct genpd_onecell_data onecell_data; >> + const struct imx_blk_ctl_dev_data *dev_data; >> + struct clk_bulk_data *clks; >> + u32 num_clks; >> + >> + atomic_t power_count; >> +}; >> + >> +#define IMX_BLK_CTL(_type, _name, _parent_name, _id, _offset, _mask, _rst_offset, _rst_mask, \ >> + _flags) \ >> + { \ >> + .type = _type, \ >> + .name = _name, \ >> + .parent_name = _parent_name, \ >> + .id = _id, \ >> + .offset = _offset, \ >> + .mask = _mask, \ >> + .flags = _flags, \ >> + .rst_offset = _rst_offset, \ >> + .rst_mask = _rst_mask, \ >> + } >> + >> +#define IMX_BLK_CTL_PD(_name, _parent_name, _id, _offset, _mask, _rst_offset, _rst_mask, _flags) \ >> + IMX_BLK_CTL(BLK_CTL_PD, _name, _parent_name, _id, _offset, _mask, _rst_offset, \ >> + _rst_mask, _flags) >> + >> +int imx_blk_ctl_register(struct device *dev); >> + >> +#define IMX_BLK_CTL_PD_HANDSHAKE BIT(0) >> +#define IMX_BLK_CTL_PD_RESET BIT(1) >> +#define IMX_BLK_CTL_PD_BUS BIT(2) >> + >> +const extern struct dev_pm_ops imx_blk_ctl_pm_ops; >> + >> +#endif > > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 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DB6PR0402MB2760.eurprd04.prod.outlook.com ([fe80::45b9:c993:87ec:9a64]) by DB6PR0402MB2760.eurprd04.prod.outlook.com ([fe80::45b9:c993:87ec:9a64%8]) with mapi id 15.20.4065.039; Tue, 4 May 2021 10:31:05 +0000 Subject: Re: [PATCH V2 3/4] soc: imx: Add generic blk-ctl driver To: Lucas Stach , robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, p.zabel@pengutronix.de, krzk@kernel.org, agx@sigxcpu.org, marex@denx.de, andrew.smirnov@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ping.bai@nxp.com, frieder.schrempf@kontron.de, aford173@gmail.com, abel.vesa@nxp.com, Peng Fan References: <20210430052746.10815-1-peng.fan@oss.nxp.com> <20210430052746.10815-4-peng.fan@oss.nxp.com> <6997abd422ffa1fa384a048552109aec1095abc3.camel@pengutronix.de> From: "Peng Fan (OSS)" Message-ID: <1707a917-5f91-b3e8-2be1-6461fb4c950c@oss.nxp.com> Date: Tue, 4 May 2021 18:30:52 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