linux-kernel - [PATCH 2/3] nvmem: qfprom: sc7280: Handle the additional power-domains vote

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Date:   Thu, 22 Jul 2021 10:58:35 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org,
        srinivas.kandagatla@...aro.org, robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, rbokka@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH 2/3] nvmem: qfprom: sc7280: Handle the additional power-domains vote

On sc7280, to reliably blow fuses, we need an additional vote
on max performance state of 'MX' power-domain.
Add support for power-domain performance state voting in the
driver.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
---
 drivers/nvmem/qfprom.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
index 81fbad5..4d0a576 100644
--- a/drivers/nvmem/qfprom.c
+++ b/drivers/nvmem/qfprom.c
@@ -12,6 +12,8 @@
 #include <linux/mod_devicetable.h>
 #include <linux/nvmem-provider.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>
 
@@ -149,6 +151,11 @@ static void qfprom_disable_fuse_blowing(const struct qfprom_priv *priv,
 	if (ret)
 		dev_warn(priv->dev, "Failed to set 0 voltage (ignoring)\n");
 
+	if (priv->dev->pm_domain) {
+		dev_pm_genpd_set_performance_state(priv->dev, 0);
+		pm_runtime_put(priv->dev);
+	}
+
 	ret = regulator_disable(priv->vcc);
 	if (ret)
 		dev_warn(priv->dev, "Failed to disable regulator (ignoring)\n");
@@ -212,6 +219,16 @@ static int qfprom_enable_fuse_blowing(const struct qfprom_priv *priv,
 		goto err_clk_rate_set;
 	}
 
+	if (priv->dev->pm_domain) {
+		ret = pm_runtime_get_sync(priv->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(priv->dev);
+			dev_err(priv->dev, "Failed to enable power-domain\n");
+			goto err_reg_enable;
+		}
+		dev_pm_genpd_set_performance_state(priv->dev, INT_MAX);
+	}
+
 	old->timer_val = readl(priv->qfpconf + QFPROM_BLOW_TIMER_OFFSET);
 	old->accel_val = readl(priv->qfpconf + QFPROM_ACCEL_OFFSET);
 	writel(priv->soc_data->qfprom_blow_timer_value,
@@ -221,6 +238,8 @@ static int qfprom_enable_fuse_blowing(const struct qfprom_priv *priv,
 
 	return 0;
 
+err_reg_enable:
+	regulator_disable(priv->vcc);
 err_clk_rate_set:
 	clk_set_rate(priv->secclk, old->clk_rate);
 err_clk_prepared:
@@ -420,6 +439,9 @@ static int qfprom_probe(struct platform_device *pdev)
 			econfig.reg_write = qfprom_reg_write;
 	}
 
+	if (dev->pm_domain)
+		pm_runtime_enable(dev);
+
 	nvmem = devm_nvmem_register(dev, &econfig);
 
 	return PTR_ERR_OR_ZERO(nvmem);
-- 
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