linux-kernel - Re: [PATCH] mfd: qcom_rpm: parametrize also ack selector size

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Date:	Tue, 28 Jun 2016 16:35:36 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Neil Armstrong <narmstrong@...libre.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] mfd: qcom_rpm: parametrize also ack selector size

On Wed, 22 Jun 2016, Linus Walleij wrote:

> The RPM has two sets of selectors (IPC bit fields): request and
> acknowledge. Apparently, some models use 4*32 bit words for select
> and some use 7*32 bit words for request, but all use 7*32 words
> for acknowledge bits.
> 
> So apparently you can on the models with requests of 4*32 select
> bits send 4*32 messages and get 7*32 different replies, so on ACK
> interrupt, 7*32 bit words need to be read. This is how the vendor
> code apparently works.
> 
> Cc: stable@...r.kernel.org
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Björn Andersson <bjorn.andersson@...aro.org>
> Reported-by: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> Lee: this patch goes on top of the previous patch I sent:
> "mfd: qcom_rpm: fix offset error for msm8660"
> You can also squash them, if you prefer.
> ---
>  drivers/mfd/qcom_rpm.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
> index 9364f88264e5..880d4699bcb0 100644
> --- a/drivers/mfd/qcom_rpm.c
> +++ b/drivers/mfd/qcom_rpm.c
> @@ -39,7 +39,8 @@ struct qcom_rpm_data {
>  	unsigned int req_sel_off;
>  	unsigned int ack_ctx_off;
>  	unsigned int ack_sel_off;
> -	unsigned int sel_size;
> +	unsigned int req_sel_size;
> +	unsigned int ack_sel_size;
>  };
>  
>  struct qcom_rpm {
> @@ -162,7 +163,8 @@ static const struct qcom_rpm_data apq8064_template = {
>  	.req_sel_off = 11,
>  	.ack_ctx_off = 15,
>  	.ack_sel_off = 23,
> -	.sel_size = 4,
> +	.req_sel_size = 4,
> +	.ack_sel_size = 7,
>  };
>  
>  static const struct qcom_rpm_resource msm8660_rpm_resource_table[] = {
> @@ -250,7 +252,8 @@ static const struct qcom_rpm_data msm8660_template = {
>  	.req_sel_off = 11,
>  	.ack_ctx_off = 19,
>  	.ack_sel_off = 27,
> -	.sel_size = 7,
> +	.req_sel_size = 7,
> +	.ack_sel_size = 7,
>  };
>  
>  static const struct qcom_rpm_resource msm8960_rpm_resource_table[] = {
> @@ -337,7 +340,8 @@ static const struct qcom_rpm_data msm8960_template = {
>  	.req_sel_off = 11,
>  	.ack_ctx_off = 15,
>  	.ack_sel_off = 23,
> -	.sel_size = 4,
> +	.req_sel_size = 4,
> +	.ack_sel_size = 7,
>  };
>  
>  static const struct qcom_rpm_resource ipq806x_rpm_resource_table[] = {
> @@ -382,7 +386,8 @@ static const struct qcom_rpm_data ipq806x_template = {
>  	.req_sel_off = 11,
>  	.ack_ctx_off = 15,
>  	.ack_sel_off = 23,
> -	.sel_size = 4,
> +	.req_sel_size = 4,
> +	.ack_sel_size = 7,
>  };
>  
>  static const struct of_device_id qcom_rpm_of_match[] = {
> @@ -419,7 +424,7 @@ int qcom_rpm_write(struct qcom_rpm *rpm,
>  		writel_relaxed(buf[i], RPM_REQ_REG(rpm, res->target_id + i));
>  
>  	bitmap_set((unsigned long *)sel_mask, res->select_id, 1);
> -	for (i = 0; i < rpm->data->sel_size; i++) {
> +	for (i = 0; i < rpm->data->req_sel_size; i++) {
>  		writel_relaxed(sel_mask[i],
>  			       RPM_CTRL_REG(rpm, rpm->data->req_sel_off + i));
>  	}
> @@ -448,7 +453,7 @@ static irqreturn_t qcom_rpm_ack_interrupt(int irq, void *dev)
>  	int i;
>  
>  	ack = readl_relaxed(RPM_CTRL_REG(rpm, rpm->data->ack_ctx_off));
> -	for (i = 0; i < rpm->data->sel_size; i++)
> +	for (i = 0; i < rpm->data->ack_sel_size; i++)
>  		writel_relaxed(0,
>  			RPM_CTRL_REG(rpm, rpm->data->ack_sel_off + i));
>  	writel(0, RPM_CTRL_REG(rpm, rpm->data->ack_ctx_off));

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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