From patchwork Tue Nov 28 13:03:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13471136 X-Patchwork-Delegate: daniel.lezcano@linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="i1l97BTW" Received: from relay2-d.mail.gandi.net (relay2-d.mail.gandi.net [217.70.183.194]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D6701FF6; Tue, 28 Nov 2023 05:03:41 -0800 (PST) Received: by mail.gandi.net (Postfix) with ESMTPSA id 2E58640004; Tue, 28 Nov 2023 13:03:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1701176619; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=M69X9zsO5QSQQSwQdaGpZVn6EWhBxmM/U6VT85y+SVw=; b=i1l97BTWlQ8sEzg5OGY39O7XrmWseATl3vVs5pIkw2ixDGYImtirn1izfjYlScHH2AVzqk xsQU4nKOQSaRsIleEaWlLjMKytYQyNLpgbSVwP0OWtkFZLsvGgtoup2P1UCrcHLFInPtVp Okym4p82M6+YVhLkufFjrSNgDyAg5p/OxVMTn51Mdu/dVOYdP0mo0AKxfVy+0SAkNaZrIR 6M2H3iDvrllXHk6wVJ8lO/Y8QkNOgn66pyLyspk1KqKHpaL5EorY0vu6X68zgWrWoZDnRH /dRKHcsY6OGQd43uXn2ge1MxASuQcuQoaAmvcRvkgQAgWEdwzlwbtnDHEYoZuA== From: Thomas Richard To: rafael@kernel.org, daniel.lezcano@linaro.org Cc: rui.zhang@intel.com, lukasz.luba@arm.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com, gregory.clement@bootlin.com, theo.lebrun@bootlin.com, u-kumar1@ti.com, Thomas Richard Subject: [PATCH] thermal: k3_j72xx_bandgap: implement suspend/resume support Date: Tue, 28 Nov 2023 14:03:32 +0100 Message-Id: <20231128130332.584127-1-thomas.richard@bootlin.com> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-GND-Sasl: thomas.richard@bootlin.com From: Théo Lebrun This add suspend-to-ram support. The derived_table is kept-as is, so the resume is only about pm_runtime_* calls and restoring the same registers as the probe. Extract the hardware initialization procedure to a function called at both probe-time & resume-time. The probe-time loop is split in two to ensure doing the hardware initialization before registering thermal zones. That ensures our callbacks cannot be called while in bad state. Signed-off-by: Théo Lebrun Signed-off-by: Thomas Richard --- drivers/thermal/k3_j72xx_bandgap.c | 114 ++++++++++++++++++++--------- 1 file changed, 81 insertions(+), 33 deletions(-) diff --git a/drivers/thermal/k3_j72xx_bandgap.c b/drivers/thermal/k3_j72xx_bandgap.c index c74094a86982..c7fdf6e45b1c 100644 --- a/drivers/thermal/k3_j72xx_bandgap.c +++ b/drivers/thermal/k3_j72xx_bandgap.c @@ -178,6 +178,7 @@ struct k3_j72xx_bandgap { void __iomem *base; void __iomem *cfg2_base; struct k3_thermal_data *ts_data[K3_VTM_MAX_NUM_TS]; + int cnt; }; /* common data structures */ @@ -338,24 +339,53 @@ static void print_look_up_table(struct device *dev, int *ref_table) dev_dbg(dev, "%d %d %d\n", i, derived_table[i], ref_table[i]); } +static void k3_j72xx_bandgap_init_hw(struct k3_j72xx_bandgap *bgp) +{ + struct k3_thermal_data *data; + int id, high_max, low_temp; + u32 val; + + for (id = 0; id < bgp->cnt; id++) { + data = bgp->ts_data[id]; + val = readl(bgp->cfg2_base + data->ctrl_offset); + val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN | + K3_VTM_TMPSENS_CTRL_SOC | + K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4)); + writel(val, bgp->cfg2_base + data->ctrl_offset); + } + + /* + * Program TSHUT thresholds + * Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2 + * Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN bit + * This is already taken care as per of init + * Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN bit + */ + high_max = k3_j72xx_bandgap_temp_to_adc_code(MAX_TEMP); + low_temp = k3_j72xx_bandgap_temp_to_adc_code(COOL_DOWN_TEMP); + + writel((low_temp << 16) | high_max, bgp->cfg2_base + K3_VTM_MISC_CTRL2_OFFSET); + mdelay(100); + writel(K3_VTM_ANYMAXT_OUTRG_ALERT_EN, bgp->cfg2_base + K3_VTM_MISC_CTRL_OFFSET); +} + struct k3_j72xx_bandgap_data { const bool has_errata_i2128; }; static int k3_j72xx_bandgap_probe(struct platform_device *pdev) { - int ret = 0, cnt, val, id; - int high_max, low_temp; - struct resource *res; + const struct k3_j72xx_bandgap_data *driver_data; + struct thermal_zone_device *ti_thermal; struct device *dev = &pdev->dev; + bool workaround_needed = false; struct k3_j72xx_bandgap *bgp; struct k3_thermal_data *data; - bool workaround_needed = false; - const struct k3_j72xx_bandgap_data *driver_data; - struct thermal_zone_device *ti_thermal; - int *ref_table; struct err_values err_vals; void __iomem *fuse_base; + int ret = 0, val, id; + struct resource *res; + int *ref_table; const s64 golden_factors[] = { -490019999999999936, @@ -422,10 +452,10 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) /* Get the sensor count in the VTM */ val = readl(bgp->base + K3_VTM_DEVINFO_PWR0_OFFSET); - cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK; - cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK); + bgp->cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK; + bgp->cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK); - data = devm_kcalloc(bgp->dev, cnt, sizeof(*data), GFP_KERNEL); + data = devm_kcalloc(bgp->dev, bgp->cnt, sizeof(*data), GFP_KERNEL); if (!data) { ret = -ENOMEM; goto err_alloc; @@ -449,8 +479,8 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) else init_table(3, ref_table, pvt_wa_factors); - /* Register the thermal sensors */ - for (id = 0; id < cnt; id++) { + /* Precompute the derived table & fill each thermal sensor struct */ + for (id = 0; id < bgp->cnt; id++) { data[id].bgp = bgp; data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET + id * 0x20; data[id].stat_offset = data[id].ctrl_offset + @@ -470,13 +500,13 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) else if (id == 0 && !workaround_needed) memcpy(derived_table, ref_table, TABLE_SIZE * 4); - val = readl(data[id].bgp->cfg2_base + data[id].ctrl_offset); - val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN | - K3_VTM_TMPSENS_CTRL_SOC | - K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4)); - writel(val, data[id].bgp->cfg2_base + data[id].ctrl_offset); - bgp->ts_data[id] = &data[id]; + } + + k3_j72xx_bandgap_init_hw(bgp); + + /* Register the thermal sensors */ + for (id = 0; id < bgp->cnt; id++) { ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, &data[id], &k3_of_thermal_ops); if (IS_ERR(ti_thermal)) { @@ -486,21 +516,7 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) } } - /* - * Program TSHUT thresholds - * Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2 - * Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN bit - * This is already taken care as per of init - * Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN bit - */ - high_max = k3_j72xx_bandgap_temp_to_adc_code(MAX_TEMP); - low_temp = k3_j72xx_bandgap_temp_to_adc_code(COOL_DOWN_TEMP); - - writel((low_temp << 16) | high_max, data[0].bgp->cfg2_base + - K3_VTM_MISC_CTRL2_OFFSET); - mdelay(100); - writel(K3_VTM_ANYMAXT_OUTRG_ALERT_EN, data[0].bgp->cfg2_base + - K3_VTM_MISC_CTRL_OFFSET); + platform_set_drvdata(pdev, bgp); print_look_up_table(dev, ref_table); /* @@ -527,6 +543,37 @@ static void k3_j72xx_bandgap_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); } +#ifdef CONFIG_PM +static int k3_j72xx_bandgap_suspend(struct device *dev) +{ + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + return 0; +} + +static int k3_j72xx_bandgap_resume(struct device *dev) +{ + struct k3_j72xx_bandgap *bgp = dev_get_drvdata(dev); + int ret; + + pm_runtime_enable(dev); + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + pm_runtime_disable(dev); + return ret; + } + + k3_j72xx_bandgap_init_hw(bgp); + + return 0; +} + +static const struct dev_pm_ops k3_j72xx_bandgap_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(k3_j72xx_bandgap_suspend, k3_j72xx_bandgap_resume) +}; +#endif + static const struct k3_j72xx_bandgap_data k3_j72xx_bandgap_j721e_data = { .has_errata_i2128 = true, }; @@ -554,6 +601,7 @@ static struct platform_driver k3_j72xx_bandgap_sensor_driver = { .driver = { .name = "k3-j72xx-soc-thermal", .of_match_table = of_k3_j72xx_bandgap_match, + .pm = pm_ptr(&k3_j72xx_bandgap_pm_ops), }, };