[3/7] clk: zynqmp: Warn user if clock user are more than allowed
diff mbox series

Message ID 1573564580-9006-4-git-send-email-rajan.vaja@xilinx.com
State New
Headers show
Series
  • clk: zynqmp: Extend and fix zynqmp clock driver
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Commit Message

Rajan Vaja Nov. 12, 2019, 1:16 p.m. UTC
Warn user if clock is used by more than allowed devices.
This check is done by firmware and returns respective
error code. Upon receiving error code for excessive user,
warn user for the same.

This change is done to restrict VPLL use count. It is
assumed that VPLL is used by one user only.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
---
 drivers/clk/zynqmp/pll.c             | 9 ++++++---
 drivers/firmware/xilinx/zynqmp.c     | 2 ++
 include/linux/firmware/xlnx-zynqmp.h | 1 +
 3 files changed, 9 insertions(+), 3 deletions(-)

Comments

Michael Tretter Nov. 21, 2019, 2:31 p.m. UTC | #1
On Tue, 12 Nov 2019 05:16:16 -0800, Rajan Vaja wrote:
> Warn user if clock is used by more than allowed devices.
> This check is done by firmware and returns respective
> error code. Upon receiving error code for excessive user,
> warn user for the same.
> 
> This change is done to restrict VPLL use count. It is
> assumed that VPLL is used by one user only.
> 
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
> ---
>  drivers/clk/zynqmp/pll.c             | 9 ++++++---
>  drivers/firmware/xilinx/zynqmp.c     | 2 ++
>  include/linux/firmware/xlnx-zynqmp.h | 1 +
>  3 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c
> index a541397..2f4ccaa 100644
> --- a/drivers/clk/zynqmp/pll.c
> +++ b/drivers/clk/zynqmp/pll.c
> @@ -188,9 +188,12 @@ static int zynqmp_pll_set_rate(struct clk_hw *hw, unsigned long rate,
>  		frac = (parent_rate * f) / FRAC_DIV;
>  
>  		ret = eemi_ops->clock_setdivider(clk_id, m);
> -		if (ret)
> -			pr_warn_once("%s() set divider failed for %s, ret = %d\n",
> -				     __func__, clk_name, ret);
> +		if (ret) {
> +			if (ret == -EUSERS)
> +				WARN(1, "More than allowed devices are using the %s, which is forbidden\n", clk_name);
> +			pr_err("%s() set divider failed for %s, ret = %d\n",
> +			       __func__, clk_name, ret);
> +		}

In case of -EUSERS this prints the warning and the error. This seems a
bit excessive to me. Isn't it enough to leave the existing
pr_warn_once() for the new error code? If not, then add a new warning
for the -EUSERS error, but leave the existing warning as it is.

Michael

>  
>  		eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_DATA, clk_id, f, NULL);
>  
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 0137bf3..ecc339d 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -53,6 +53,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
>  		return -EACCES;
>  	case XST_PM_ABORT_SUSPEND:
>  		return -ECANCELED;
> +	case XST_PM_MULT_USER:
> +		return -EUSERS;
>  	case XST_PM_INTERNAL:
>  	case XST_PM_CONFLICT:
>  	case XST_PM_INVALID_NODE:
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 25bedd2..f019d1c 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -96,6 +96,7 @@ enum pm_ret_status {
>  	XST_PM_INVALID_NODE,
>  	XST_PM_DOUBLE_REQ,
>  	XST_PM_ABORT_SUSPEND,
> +	XST_PM_MULT_USER = 2008,
>  };
>  
>  enum pm_ioctl_id {

Patch
diff mbox series

diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c
index a541397..2f4ccaa 100644
--- a/drivers/clk/zynqmp/pll.c
+++ b/drivers/clk/zynqmp/pll.c
@@ -188,9 +188,12 @@  static int zynqmp_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 		frac = (parent_rate * f) / FRAC_DIV;
 
 		ret = eemi_ops->clock_setdivider(clk_id, m);
-		if (ret)
-			pr_warn_once("%s() set divider failed for %s, ret = %d\n",
-				     __func__, clk_name, ret);
+		if (ret) {
+			if (ret == -EUSERS)
+				WARN(1, "More than allowed devices are using the %s, which is forbidden\n", clk_name);
+			pr_err("%s() set divider failed for %s, ret = %d\n",
+			       __func__, clk_name, ret);
+		}
 
 		eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_DATA, clk_id, f, NULL);
 
diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 0137bf3..ecc339d 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -53,6 +53,8 @@  static int zynqmp_pm_ret_code(u32 ret_status)
 		return -EACCES;
 	case XST_PM_ABORT_SUSPEND:
 		return -ECANCELED;
+	case XST_PM_MULT_USER:
+		return -EUSERS;
 	case XST_PM_INTERNAL:
 	case XST_PM_CONFLICT:
 	case XST_PM_INVALID_NODE:
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 25bedd2..f019d1c 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -96,6 +96,7 @@  enum pm_ret_status {
 	XST_PM_INVALID_NODE,
 	XST_PM_DOUBLE_REQ,
 	XST_PM_ABORT_SUSPEND,
+	XST_PM_MULT_USER = 2008,
 };
 
 enum pm_ioctl_id {