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Tue, 06 Oct 2020 00:54:22 -0700 (PDT) From: Ikjoon Jang To: Rob Herring , Mark Brown , devicetree@vger.kernel.org, linux-spi@vger.kernel.org, linux-mtd@lists.infradead.org Subject: [PATCH v5 4/4] spi: spi-mtk-nor: Add power management support Date: Tue, 6 Oct 2020 15:54:05 +0800 Message-Id: <20201006155010.v5.4.I68983b582d949a91866163bab588ff3c2a0d0275@changeid> X-Mailer: git-send-email 2.28.0.806.g8561365e88-goog In-Reply-To: <20201006075405.11658-1-ikjn@chromium.org> References: <20201006075405.11658-1-ikjn@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201006_035425_275362_3AB2169D X-CRM114-Status: GOOD ( 21.36 ) X-Spam-Score: -0.9 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:441 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.7 DKIMWL_WL_HIGH DKIMwl.org - High trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthias Brugger , linux-mediatek@lists.infradead.org, Ikjoon Jang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch adds dev_pm_ops to mtk-nor to support suspend/resume, auto suspend delay is set to -1 by default. Accessing registers are only permitted after its clock is enabled to deal with unknown state of operating clk at probe time. Signed-off-by: Ikjoon Jang --- drivers/spi/spi-mtk-nor.c | 98 ++++++++++++++++++++++++++++++--------- 1 file changed, 76 insertions(+), 22 deletions(-) diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c index e46d5c93d742..b97f26a60cbe 100644 --- a/drivers/spi/spi-mtk-nor.c +++ b/drivers/spi/spi-mtk-nor.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -690,22 +691,15 @@ static int mtk_nor_enable_clk(struct mtk_nor *sp) return 0; } -static int mtk_nor_init(struct mtk_nor *sp) +static void mtk_nor_init(struct mtk_nor *sp) { - int ret; - - ret = mtk_nor_enable_clk(sp); - if (ret) - return ret; - - sp->spi_freq = clk_get_rate(sp->spi_clk); + writel(0, sp->base + MTK_NOR_REG_IRQ_EN); + writel(MTK_NOR_IRQ_MASK, sp->base + MTK_NOR_REG_IRQ_STAT); writel(MTK_NOR_ENABLE_SF_CMD, sp->base + MTK_NOR_REG_WP); mtk_nor_rmw(sp, MTK_NOR_REG_CFG2, MTK_NOR_WR_CUSTOM_OP_EN, 0); mtk_nor_rmw(sp, MTK_NOR_REG_CFG3, MTK_NOR_DISABLE_WREN | MTK_NOR_DISABLE_SR_POLL, 0); - - return ret; } static irqreturn_t mtk_nor_irq_handler(int irq, void *data) @@ -788,6 +782,7 @@ static int mtk_nor_probe(struct platform_device *pdev) ctlr->num_chipselect = 1; ctlr->setup = mtk_nor_setup; ctlr->transfer_one_message = mtk_nor_transfer_one_message; + ctlr->auto_runtime_pm = true; dev_set_drvdata(&pdev->dev, ctlr); @@ -811,12 +806,19 @@ static int mtk_nor_probe(struct platform_device *pdev) return -ENOMEM; } + ret = mtk_nor_enable_clk(sp); + if (ret < 0) + return ret; + + sp->spi_freq = clk_get_rate(sp->spi_clk); + + mtk_nor_init(sp); + irq = platform_get_irq_optional(pdev, 0); + if (irq < 0) { dev_warn(sp->dev, "IRQ not available."); } else { - writel(MTK_NOR_IRQ_MASK, base + MTK_NOR_REG_IRQ_STAT); - writel(0, base + MTK_NOR_REG_IRQ_EN); ret = devm_request_irq(sp->dev, irq, mtk_nor_irq_handler, 0, pdev->name, sp); if (ret < 0) { @@ -827,34 +829,86 @@ static int mtk_nor_probe(struct platform_device *pdev) } } - ret = mtk_nor_init(sp); - if (ret < 0) { - kfree(ctlr); - return ret; - } + pm_runtime_set_autosuspend_delay(&pdev->dev, -1); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret < 0) + goto err_probe; + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); dev_info(&pdev->dev, "spi frequency: %d Hz\n", sp->spi_freq); - return devm_spi_register_controller(&pdev->dev, ctlr); + return 0; + +err_probe: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + + mtk_nor_disable_clk(sp); + + return ret; } static int mtk_nor_remove(struct platform_device *pdev) { - struct spi_controller *ctlr; - struct mtk_nor *sp; + struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); - ctlr = dev_get_drvdata(&pdev->dev); - sp = spi_controller_get_devdata(ctlr); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + + mtk_nor_disable_clk(sp); + + return 0; +} + +static int __maybe_unused mtk_nor_runtime_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); mtk_nor_disable_clk(sp); return 0; } +static int __maybe_unused mtk_nor_runtime_resume(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); + + return mtk_nor_enable_clk(sp); +} + +static int __maybe_unused mtk_nor_suspend(struct device *dev) +{ + return pm_runtime_force_suspend(dev); +} + +static int __maybe_unused mtk_nor_resume(struct device *dev) +{ + return pm_runtime_force_resume(dev); +} + +static const struct dev_pm_ops mtk_nor_pm_ops = { + SET_RUNTIME_PM_OPS(mtk_nor_runtime_suspend, + mtk_nor_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(mtk_nor_suspend, mtk_nor_resume) +}; + static struct platform_driver mtk_nor_driver = { .driver = { .name = DRIVER_NAME, .of_match_table = mtk_nor_match, + .pm = &mtk_nor_pm_ops, }, .probe = mtk_nor_probe, .remove = mtk_nor_remove,