Re: [PATCH v12 2/2] cpufreq: qcom-hw: Add support for QCOM cpufreq HW driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello Stephen, Viresh,

On 12/13/2018 3:28 PM, Stephen Boyd wrote:
Quoting Taniya Das (2018-12-12 23:49:54)
The CPUfreq HW present in some QCOM chipsets offloads the steps necessary
for changing the frequency of CPUs. The driver implements the cpufreq
driver interface for this hardware engine.

Signed-off-by: Saravana Kannan <skannan@xxxxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Signed-off-by: Taniya Das <tdas@xxxxxxxxxxxxxx>
---

Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>

But I noticed that we don't release the I/O region anymore so hotplug
and replug of a whole clk domain fails. I guess devm_ioremap_resource()
was just too much magic so how about we downgrade to devm_ioremap()
instead?

BTW, Viresh, I see a lockdep splat when cpufreq_init returns an error
upon bringing the policy online the second time. I guess cpufreq_stats
aren't able to be freed from there because they take locks in different
order vs. the normal path?

-----8<-------
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index fce7a1162e87..0e1105151478 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -182,9 +182,12 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
  	index = args.args[0];
res = platform_get_resource(global_pdev, IORESOURCE_MEM, index);
-	base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	if (!res)
+		return -ENODEV;
+
+	base = devm_ioremap(dev, res->start, resource_size(res));
+	if (!base)
+		return -ENOMEM;

Updated the above in the next series.

  	/* HW should be in enabled state to proceed */
  	if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) {


--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.

--



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux