diff mbox series

[v2,1/3] PCI: rockchip: Simplify clock handling by using clk_bulk*() function

Message ID 20240621064426.282048-1-linux.amoon@gmail.com
State New
Headers show
Series [v2,1/3] PCI: rockchip: Simplify clock handling by using clk_bulk*() function | expand

Commit Message

Anand Moon June 21, 2024, 6:44 a.m. UTC 
Refactors the clock handling in the Rockchip PCIe driver,
introducing a more robust and efficient method for enabling and
disabling clocks using clk_bulk*() API. Using the clk_bulk APIs,
the clock handling for the core clocks becomes much simpler.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406200818.CQ7DXNSZ-lkp@intel.com/
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
Fix compilation error reported by Intel test robot
---
 drivers/pci/controller/pcie-rockchip.c | 64 ++++----------------------
 drivers/pci/controller/pcie-rockchip.h | 15 ++++--
 2 files changed, 21 insertions(+), 58 deletions(-)


base-commit: 50736169ecc8387247fe6a00932852ce7b057083

Comments

Bjorn Helgaas June 21, 2024, 9:21 p.m. UTC | #1 
On Fri, Jun 21, 2024 at 12:14:20PM +0530, Anand Moon wrote:
> Refactors the clock handling in the Rockchip PCIe driver,
> introducing a more robust and efficient method for enabling and
> disabling clocks using clk_bulk*() API. Using the clk_bulk APIs,
> the clock handling for the core clocks becomes much simpler.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202406200818.CQ7DXNSZ-lkp@intel.com/

Drop these two lines, as suggested in the test robot report:

  If you fix the issue in a separate patch/commit (i.e. not just a new
  version of the same patch/commit), kindly add following tags ...

This is a new version of the same patch, so it doesn't need those
tags.

The problem you're solving with this patch is that the clock handling
is too complicated.  The test robot didn't report *that* problem.

Since you'll repost for this, also s/Refactors/Refactor/ in the commit
log so this is in imperative mood:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=v6.9#n94
https://chris.beams.io/posts/git-commit/

>  drivers/pci/controller/pcie-rockchip.c | 64 ++++----------------------
>  drivers/pci/controller/pcie-rockchip.h | 15 ++++--
>  2 files changed, 21 insertions(+), 58 deletions(-)

Nice reduction in lines!
Anand Moon June 22, 2024, 4:29 a.m. UTC | #2 
Hi Bjorn

On Sat, 22 Jun 2024 at 02:51, Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> On Fri, Jun 21, 2024 at 12:14:20PM +0530, Anand Moon wrote:
> > Refactors the clock handling in the Rockchip PCIe driver,
> > introducing a more robust and efficient method for enabling and
> > disabling clocks using clk_bulk*() API. Using the clk_bulk APIs,
> > the clock handling for the core clocks becomes much simpler.
> >
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202406200818.CQ7DXNSZ-lkp@intel.com/
>
> Drop these two lines, as suggested in the test robot report:
>
>   If you fix the issue in a separate patch/commit (i.e. not just a new
>   version of the same patch/commit), kindly add following tags ...
>
> This is a new version of the same patch, so it doesn't need those
> tags.
>
Ok.
> The problem you're solving with this patch is that the clock handling
> is too complicated.  The test robot didn't report *that* problem.
>
> Since you'll repost for this, also s/Refactors/Refactor/ in the commit
> log so this is in imperative mood:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=v6.9#n94
> https://chris.beams.io/posts/git-commit/
>
Ok, I will follow up on this process in the future.

> >  drivers/pci/controller/pcie-rockchip.c | 64 ++++----------------------
> >  drivers/pci/controller/pcie-rockchip.h | 15 ++++--
> >  2 files changed, 21 insertions(+), 58 deletions(-)
>
> Nice reduction in lines!

Thanks
-Anand
diff mbox series

Patch

diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
index 0ef2e622d36e..166dad666a35 100644
--- a/drivers/pci/controller/pcie-rockchip.c
+++ b/drivers/pci/controller/pcie-rockchip.c
@@ -30,7 +30,7 @@  int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct device_node *node = dev->of_node;
 	struct resource *regs;
-	int err;
+	int err, i;
 
 	if (rockchip->is_rc) {
 		regs = platform_get_resource_byname(pdev,
@@ -127,28 +127,13 @@  int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 					     "failed to get ep GPIO\n");
 	}
 
-	rockchip->aclk_pcie = devm_clk_get(dev, "aclk");
-	if (IS_ERR(rockchip->aclk_pcie)) {
-		dev_err(dev, "aclk clock not found\n");
-		return PTR_ERR(rockchip->aclk_pcie);
-	}
-
-	rockchip->aclk_perf_pcie = devm_clk_get(dev, "aclk-perf");
-	if (IS_ERR(rockchip->aclk_perf_pcie)) {
-		dev_err(dev, "aclk_perf clock not found\n");
-		return PTR_ERR(rockchip->aclk_perf_pcie);
-	}
-
-	rockchip->hclk_pcie = devm_clk_get(dev, "hclk");
-	if (IS_ERR(rockchip->hclk_pcie)) {
-		dev_err(dev, "hclk clock not found\n");
-		return PTR_ERR(rockchip->hclk_pcie);
-	}
+	for (i = 0; i < ROCKCHIP_NUM_CLKS; i++)
+		rockchip->clks[i].id = rockchip_pci_clks[i];
 
-	rockchip->clk_pcie_pm = devm_clk_get(dev, "pm");
-	if (IS_ERR(rockchip->clk_pcie_pm)) {
-		dev_err(dev, "pm clock not found\n");
-		return PTR_ERR(rockchip->clk_pcie_pm);
+	err = devm_clk_bulk_get(dev, ROCKCHIP_NUM_CLKS, rockchip->clks);
+	if (err) {
+		dev_err(dev, "rockchip clk bulk get failed\n");
+		return err;
 	}
 
 	return 0;
@@ -372,39 +357,13 @@  int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip)
 	struct device *dev = rockchip->dev;
 	int err;
 
-	err = clk_prepare_enable(rockchip->aclk_pcie);
+	err = clk_bulk_prepare_enable(ROCKCHIP_NUM_CLKS, rockchip->clks);
 	if (err) {
-		dev_err(dev, "unable to enable aclk_pcie clock\n");
+		dev_err(dev, "rockchip clk bulk prepare enable failed\n");
 		return err;
 	}
 
-	err = clk_prepare_enable(rockchip->aclk_perf_pcie);
-	if (err) {
-		dev_err(dev, "unable to enable aclk_perf_pcie clock\n");
-		goto err_aclk_perf_pcie;
-	}
-
-	err = clk_prepare_enable(rockchip->hclk_pcie);
-	if (err) {
-		dev_err(dev, "unable to enable hclk_pcie clock\n");
-		goto err_hclk_pcie;
-	}
-
-	err = clk_prepare_enable(rockchip->clk_pcie_pm);
-	if (err) {
-		dev_err(dev, "unable to enable clk_pcie_pm clock\n");
-		goto err_clk_pcie_pm;
-	}
-
 	return 0;
-
-err_clk_pcie_pm:
-	clk_disable_unprepare(rockchip->hclk_pcie);
-err_hclk_pcie:
-	clk_disable_unprepare(rockchip->aclk_perf_pcie);
-err_aclk_perf_pcie:
-	clk_disable_unprepare(rockchip->aclk_pcie);
-	return err;
 }
 EXPORT_SYMBOL_GPL(rockchip_pcie_enable_clocks);
 
@@ -412,10 +371,7 @@  void rockchip_pcie_disable_clocks(void *data)
 {
 	struct rockchip_pcie *rockchip = data;
 
-	clk_disable_unprepare(rockchip->clk_pcie_pm);
-	clk_disable_unprepare(rockchip->hclk_pcie);
-	clk_disable_unprepare(rockchip->aclk_perf_pcie);
-	clk_disable_unprepare(rockchip->aclk_pcie);
+	clk_bulk_disable_unprepare(ROCKCHIP_NUM_CLKS, rockchip->clks);
 }
 EXPORT_SYMBOL_GPL(rockchip_pcie_disable_clocks);
 
diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h
index 6111de35f84c..72346e17e45e 100644
--- a/drivers/pci/controller/pcie-rockchip.h
+++ b/drivers/pci/controller/pcie-rockchip.h
@@ -11,6 +11,7 @@ 
 #ifndef _PCIE_ROCKCHIP_H
 #define _PCIE_ROCKCHIP_H
 
+#include <linux/clk.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/pci-ecam.h>
@@ -287,6 +288,15 @@ 
 		(((c) << ((b) * 8 + 5)) & \
 		 ROCKCHIP_PCIE_CORE_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b))
 
+#define ROCKCHIP_NUM_CLKS	ARRAY_SIZE(rockchip_pci_clks)
+
+static const char * const rockchip_pci_clks[] = {
+	"aclk",
+	"aclk-perf",
+	"hclk",
+	"pm",
+};
+
 struct rockchip_pcie {
 	void	__iomem *reg_base;		/* DT axi-base */
 	void	__iomem *apb_base;		/* DT apb-base */
@@ -299,10 +309,7 @@  struct rockchip_pcie {
 	struct	reset_control *pm_rst;
 	struct	reset_control *aclk_rst;
 	struct	reset_control *pclk_rst;
-	struct	clk *aclk_pcie;
-	struct	clk *aclk_perf_pcie;
-	struct	clk *hclk_pcie;
-	struct	clk *clk_pcie_pm;
+	struct  clk_bulk_data clks[ROCKCHIP_NUM_CLKS];
 	struct	regulator *vpcie12v; /* 12V power supply */
 	struct	regulator *vpcie3v3; /* 3.3V power supply */
 	struct	regulator *vpcie1v8; /* 1.8V power supply */