[PATCH V2] cpufreq: imx-cpufreq-dt: Correct i.MX8MN's default speed grade value

[PATCH V2] cpufreq: imx-cpufreq-dt: Correct i.MX8MN's default speed grade value

[Anson Huang]

i.MX8MN has different speed grade definition compared to
i.MX8MQ/i.MX8MM, when fuses are NOT written, the default
speed_grade should be set to minimum available OPP defined
in DT which is 1.2GHz, the corresponding speed_grade value
should be 0xb.

Fixes: 5b8010ba70d5 ("cpufreq: imx-cpufreq-dt: Add i.MX8MN support")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V1:
	- Improve the coding style by removing the tab;
---
 drivers/cpufreq/imx-cpufreq-dt.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
index 35db14c..85a6efd 100644
--- a/drivers/cpufreq/imx-cpufreq-dt.c
+++ b/drivers/cpufreq/imx-cpufreq-dt.c
@@ -44,19 +44,19 @@ static int imx_cpufreq_dt_probe(struct platform_device *pdev)
 	mkt_segment = (cell_value & OCOTP_CFG3_MKT_SEGMENT_MASK) >> OCOTP_CFG3_MKT_SEGMENT_SHIFT;
 
 	/*
-	 * Early samples without fuses written report "0 0" which means
-	 * consumer segment and minimum speed grading.
-	 *
-	 * According to datasheet minimum speed grading is not supported for
-	 * consumer parts so clamp to 1 to avoid warning for "no OPPs"
+	 * Early samples without fuses written report "0 0" which may NOT
+	 * match any OPP defined in DT. So clamp to minimum OPP defined in
+	 * DT to avoid warning for "no OPPs".
 	 *
 	 * Applies to i.MX8M series SoCs.
 	 */
-	if (mkt_segment == 0 && speed_grade == 0 && (
-			of_machine_is_compatible("fsl,imx8mm") ||
-			of_machine_is_compatible("fsl,imx8mn") ||
-			of_machine_is_compatible("fsl,imx8mq")))
-		speed_grade = 1;
+	if (mkt_segment == 0 && speed_grade == 0) {
+		if (of_machine_is_compatible("fsl,imx8mm") ||
+		    of_machine_is_compatible("fsl,imx8mq"))
+			speed_grade = 1;
+		if (of_machine_is_compatible("fsl,imx8mn"))
+			speed_grade = 0xb;
+	}
 
 	supported_hw[0] = BIT(speed_grade);
 	supported_hw[1] = BIT(mkt_segment);
-- 
2.7.4


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Re: [PATCH V2] cpufreq: imx-cpufreq-dt: Correct i.MX8MN's default speed grade value

[Viresh Kumar]

On 22-10-19, 16:33, Anson Huang wrote:
> i.MX8MN has different speed grade definition compared to
> i.MX8MQ/i.MX8MM, when fuses are NOT written, the default
> speed_grade should be set to minimum available OPP defined
> in DT which is 1.2GHz, the corresponding speed_grade value
> should be 0xb.
> 
> Fixes: 5b8010ba70d5 ("cpufreq: imx-cpufreq-dt: Add i.MX8MN support")
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> Changes since V1:
> 	- Improve the coding style by removing the tab;
> ---
>  drivers/cpufreq/imx-cpufreq-dt.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)

Applied. Thanks.

-- 
viresh

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