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[PATCH] mfd: qcom_rpm: fix offset error for msm8660

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  [PATCH] mfd: qcom_rpm: fix offset error for msm8660 Linus Walleij <linus.walleij@linaro.org> - 2016-06-14 11:50 +0200
    Re: [PATCH] mfd: qcom_rpm: fix offset error for msm8660 Stephen Boyd <sboyd@codeaurora.org> - 2016-06-14 21:00 +0200
      Re: [PATCH] mfd: qcom_rpm: fix offset error for msm8660 Linus Walleij <linus.walleij@linaro.org> - 2016-06-14 21:40 +0200
    Re: [PATCH] mfd: qcom_rpm: fix offset error for msm8660 Bjorn Andersson <bjorn.andersson@linaro.org> - 2016-06-14 21:40 +0200

#1421719 — [PATCH] mfd: qcom_rpm: fix offset error for msm8660

The RPM in MSM8660/APQ8060 has different offsets to the selector
ACK and request context ACK registers. Make all these register
offsets part of the per-SoC data and assign the right values.

The bug was found by verifying backwards to the vendor tree in
the out-of-tree files <mach/rpm-[8660|8064|8960]>: all were using
offsets 3,11,15,23 except the MSM8660/APQ8060 which was using
offsets 3,11,19,27.

Cc: stable@vger.kernel.org
Fixes: 58e214382bdd ("mfd: qcom-rpm: Driver for the Qualcomm RPM")
Cc: Björn Andersson <bjorn.andersson@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/mfd/qcom_rpm.c | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
index 4f589cf75549..82cc7986e1ca 100644
--- a/drivers/mfd/qcom_rpm.c
+++ b/drivers/mfd/qcom_rpm.c
@@ -34,7 +34,11 @@ struct qcom_rpm_resource {
 struct qcom_rpm_data {
 	u32 version;
 	const struct qcom_rpm_resource *resource_table;
-	unsigned n_resources;
+	unsigned int n_resources;
+	unsigned int req_ctx_off;
+	unsigned int req_sel_off;
+	unsigned int ack_ctx_off;
+	unsigned int ack_sel_off;
 };
 
 struct qcom_rpm {
@@ -61,10 +65,6 @@ struct qcom_rpm {
 
 #define RPM_REQUEST_TIMEOUT	(5 * HZ)
 
-#define RPM_REQUEST_CONTEXT	3
-#define RPM_REQ_SELECT		11
-#define RPM_ACK_CONTEXT		15
-#define RPM_ACK_SELECTOR	23
 #define RPM_SELECT_SIZE		7
 
 #define RPM_NOTIFICATION	BIT(30)
@@ -155,6 +155,10 @@ static const struct qcom_rpm_data apq8064_template = {
 	.version = 3,
 	.resource_table = apq8064_rpm_resource_table,
 	.n_resources = ARRAY_SIZE(apq8064_rpm_resource_table),
+	.req_ctx_off = 3,
+	.req_sel_off =  11,
+	.ack_ctx_off = 15,
+	.ack_sel_off = 23,
 };
 
 static const struct qcom_rpm_resource msm8660_rpm_resource_table[] = {
@@ -238,6 +242,10 @@ static const struct qcom_rpm_data msm8660_template = {
 	.version = 2,
 	.resource_table = msm8660_rpm_resource_table,
 	.n_resources = ARRAY_SIZE(msm8660_rpm_resource_table),
+	.req_ctx_off = 3,
+	.req_sel_off =  11,
+	.ack_ctx_off = 19,
+	.ack_sel_off = 27,
 };
 
 static const struct qcom_rpm_resource msm8960_rpm_resource_table[] = {
@@ -320,6 +328,10 @@ static const struct qcom_rpm_data msm8960_template = {
 	.version = 3,
 	.resource_table = msm8960_rpm_resource_table,
 	.n_resources = ARRAY_SIZE(msm8960_rpm_resource_table),
+	.req_ctx_off = 3,
+	.req_sel_off =  11,
+	.ack_ctx_off = 15,
+	.ack_sel_off = 23,
 };
 
 static const struct qcom_rpm_resource ipq806x_rpm_resource_table[] = {
@@ -360,6 +372,10 @@ static const struct qcom_rpm_data ipq806x_template = {
 	.version = 3,
 	.resource_table = ipq806x_rpm_resource_table,
 	.n_resources = ARRAY_SIZE(ipq806x_rpm_resource_table),
+	.req_ctx_off = 3,
+	.req_sel_off =  11,
+	.ack_ctx_off = 15,
+	.ack_sel_off = 23,
 };
 
 static const struct of_device_id qcom_rpm_of_match[] = {
@@ -398,10 +414,10 @@ int qcom_rpm_write(struct qcom_rpm *rpm,
 	bitmap_set((unsigned long *)sel_mask, res->select_id, 1);
 	for (i = 0; i < ARRAY_SIZE(sel_mask); i++) {
 		writel_relaxed(sel_mask[i],
-			       RPM_CTRL_REG(rpm, RPM_REQ_SELECT + i));
+			       RPM_CTRL_REG(rpm, rpm->data->req_sel_off + i));
 	}
 
-	writel_relaxed(BIT(state), RPM_CTRL_REG(rpm, RPM_REQUEST_CONTEXT));
+	writel_relaxed(BIT(state), RPM_CTRL_REG(rpm, rpm->data->req_ctx_off));
 
 	reinit_completion(&rpm->ack);
 	regmap_write(rpm->ipc_regmap, rpm->ipc_offset, BIT(rpm->ipc_bit));
@@ -424,10 +440,11 @@ static irqreturn_t qcom_rpm_ack_interrupt(int irq, void *dev)
 	u32 ack;
 	int i;
 
-	ack = readl_relaxed(RPM_CTRL_REG(rpm, RPM_ACK_CONTEXT));
+	ack = readl_relaxed(RPM_CTRL_REG(rpm, rpm->data->ack_ctx_off));
 	for (i = 0; i < RPM_SELECT_SIZE; i++)
-		writel_relaxed(0, RPM_CTRL_REG(rpm, RPM_ACK_SELECTOR + i));
-	writel(0, RPM_CTRL_REG(rpm, RPM_ACK_CONTEXT));
+		writel_relaxed(0,
+			RPM_CTRL_REG(rpm, rpm->data->ack_sel_off + i));
+	writel(0, RPM_CTRL_REG(rpm, rpm->data->ack_ctx_off));
 
 	if (ack & RPM_NOTIFICATION) {
 		dev_warn(rpm->dev, "ignoring notification!\n");
-- 
2.4.11

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#1422222

On 06/14, Linus Walleij wrote:
> The RPM in MSM8660/APQ8060 has different offsets to the selector
> ACK and request context ACK registers. Make all these register
> offsets part of the per-SoC data and assign the right values.
> 
> The bug was found by verifying backwards to the vendor tree in
> the out-of-tree files <mach/rpm-[8660|8064|8960]>: all were using
> offsets 3,11,15,23 except the MSM8660/APQ8060 which was using
> offsets 3,11,19,27.
> 
> Cc: stable@vger.kernel.org
> Fixes: 58e214382bdd ("mfd: qcom-rpm: Driver for the Qualcomm RPM")
> Cc: Björn Andersson <bjorn.andersson@linaro.org>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Good catch! That macro maze is fun.

> ---
>  drivers/mfd/qcom_rpm.c | 37 +++++++++++++++++++++++++++----------
>  1 file changed, 27 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
> index 4f589cf75549..82cc7986e1ca 100644
> --- a/drivers/mfd/qcom_rpm.c
> +++ b/drivers/mfd/qcom_rpm.c
> @@ -34,7 +34,11 @@ struct qcom_rpm_resource {
>  struct qcom_rpm_data {
>  	u32 version;
>  	const struct qcom_rpm_resource *resource_table;
> -	unsigned n_resources;
> +	unsigned int n_resources;
> +	unsigned int req_ctx_off;
> +	unsigned int req_sel_off;
> +	unsigned int ack_ctx_off;
> +	unsigned int ack_sel_off;
>  };
>  
>  struct qcom_rpm {
> @@ -61,10 +65,6 @@ struct qcom_rpm {
>  
>  #define RPM_REQUEST_TIMEOUT	(5 * HZ)
>  
> -#define RPM_REQUEST_CONTEXT	3
> -#define RPM_REQ_SELECT		11
> -#define RPM_ACK_CONTEXT		15
> -#define RPM_ACK_SELECTOR	23
>  #define RPM_SELECT_SIZE		7

The RPM_SELECT_SIZE is 7 on 8660, but now you've pointed out that
otherwise the size is 4. I think you've uncovered another bug.

>  
>  #define RPM_NOTIFICATION	BIT(30)
> @@ -398,10 +414,10 @@ int qcom_rpm_write(struct qcom_rpm *rpm,
>  	bitmap_set((unsigned long *)sel_mask, res->select_id, 1);
>  	for (i = 0; i < ARRAY_SIZE(sel_mask); i++) {
>  		writel_relaxed(sel_mask[i],
> -			       RPM_CTRL_REG(rpm, RPM_REQ_SELECT + i));
> +			       RPM_CTRL_REG(rpm, rpm->data->req_sel_off + i));

Here we write from 0 to ARRAY_SIZE(sel_mask) which is 7. That
would mean we write into the ack context that starts at 15 (we
start writing at req_sel_off which is always 11). Oops.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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#1422254

On Tue, Jun 14, 2016 at 8:51 PM, Stephen Boyd <sboyd@codeaurora.org> wrote:
> On 06/14, Linus Walleij wrote:

>> -#define RPM_REQUEST_CONTEXT  3
>> -#define RPM_REQ_SELECT               11
>> -#define RPM_ACK_CONTEXT              15
>> -#define RPM_ACK_SELECTOR     23
>>  #define RPM_SELECT_SIZE              7
>
> The RPM_SELECT_SIZE is 7 on 8660, but now you've pointed out that
> otherwise the size is 4. I think you've uncovered another bug.

OMG you're right. I'll send a v2 fixing that too.

>> -                            RPM_CTRL_REG(rpm, RPM_REQ_SELECT + i));
>> +                            RPM_CTRL_REG(rpm, rpm->data->req_sel_off + i));
>
> Here we write from 0 to ARRAY_SIZE(sel_mask) which is 7. That
> would mean we write into the ack context that starts at 15 (we
> start writing at req_sel_off which is always 11). Oops.

Argh well it seems it didn't hurt so far but let's have it fixed.

Yours,
Linus Walleij

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#1422251

On Tue 14 Jun 02:48 PDT 2016, Linus Walleij wrote:

> The RPM in MSM8660/APQ8060 has different offsets to the selector
> ACK and request context ACK registers. Make all these register
> offsets part of the per-SoC data and assign the right values.
> 
> The bug was found by verifying backwards to the vendor tree in
> the out-of-tree files <mach/rpm-[8660|8064|8960]>: all were using
> offsets 3,11,15,23 except the MSM8660/APQ8060 which was using
> offsets 3,11,19,27.
> 
> Cc: stable@vger.kernel.org
> Fixes: 58e214382bdd ("mfd: qcom-rpm: Driver for the Qualcomm RPM")
> Cc: Björn Andersson <bjorn.andersson@linaro.org>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Thanks for finding this, sorry for not getting it right in the first
place.

With the note about the odd indentation below, and a wish that you fix
the sel_mask length

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> ---
>  drivers/mfd/qcom_rpm.c | 37 +++++++++++++++++++++++++++----------
>  1 file changed, 27 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
[..]
> @@ -155,6 +155,10 @@ static const struct qcom_rpm_data apq8064_template = {
>  	.version = 3,
>  	.resource_table = apq8064_rpm_resource_table,
>  	.n_resources = ARRAY_SIZE(apq8064_rpm_resource_table),
> +	.req_ctx_off = 3,
> +	.req_sel_off =  11,

Odd indentation of 11, here and below.

> +	.ack_ctx_off = 15,
> +	.ack_sel_off = 23,
>  };
>  
>  static const struct qcom_rpm_resource msm8660_rpm_resource_table[] = {
> @@ -238,6 +242,10 @@ static const struct qcom_rpm_data msm8660_template = {
>  	.version = 2,
>  	.resource_table = msm8660_rpm_resource_table,
>  	.n_resources = ARRAY_SIZE(msm8660_rpm_resource_table),
> +	.req_ctx_off = 3,
> +	.req_sel_off =  11,
> +	.ack_ctx_off = 19,
> +	.ack_sel_off = 27,
>  };
>  
>  static const struct qcom_rpm_resource msm8960_rpm_resource_table[] = {
> @@ -320,6 +328,10 @@ static const struct qcom_rpm_data msm8960_template = {
>  	.version = 3,
>  	.resource_table = msm8960_rpm_resource_table,
>  	.n_resources = ARRAY_SIZE(msm8960_rpm_resource_table),
> +	.req_ctx_off = 3,
> +	.req_sel_off =  11,
> +	.ack_ctx_off = 15,
> +	.ack_sel_off = 23,
>  };
>  
>  static const struct qcom_rpm_resource ipq806x_rpm_resource_table[] = {
> @@ -360,6 +372,10 @@ static const struct qcom_rpm_data ipq806x_template = {
>  	.version = 3,
>  	.resource_table = ipq806x_rpm_resource_table,
>  	.n_resources = ARRAY_SIZE(ipq806x_rpm_resource_table),
> +	.req_ctx_off = 3,
> +	.req_sel_off =  11,
> +	.ack_ctx_off = 15,
> +	.ack_sel_off = 23,
>  };
>  
>  static const struct of_device_id qcom_rpm_of_match[] = {
> @@ -398,10 +414,10 @@ int qcom_rpm_write(struct qcom_rpm *rpm,
>  	bitmap_set((unsigned long *)sel_mask, res->select_id, 1);
>  	for (i = 0; i < ARRAY_SIZE(sel_mask); i++) {

As Stephen pointed out, this constant should be platform specific as
well. Would you mind fold that in, or maybe write a separate patch for
it?

>  		writel_relaxed(sel_mask[i],
> -			       RPM_CTRL_REG(rpm, RPM_REQ_SELECT + i));
> +			       RPM_CTRL_REG(rpm, rpm->data->req_sel_off + i));
>  	}

Regards,
Bjorn

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