On Fri, Oct 12, 2012 at 3:06 AM, Omar Ramirez Luna <omar.luna@xxxxxxxxxx> wrote:
> Use runtime PM functionality interfaced with hwmod enable/idle
> functions, to replace direct clock operations and sysconfig
> handling.
>
> Dues to reset sequence, pm_runtime_put_sync must be used, to avoid
> possible operations with the module under reset.
I already made most of these comments, but here they go again.
> @@ -142,11 +142,10 @@ static int iommu_enable(struct omap_iommu *obj)
> }
> }
>
> - clk_enable(obj->clk);
> + pm_runtime_get_sync(obj->dev);
>
> err = arch_iommu->enable(obj);
>
> - clk_disable(obj->clk);
The device will never go to sleep, until iommu_disable is called.
clk_enable -> pm_runtime_get_sync, clk_disable pm_runtime_put.
> @@ -288,7 +285,7 @@ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
> if (!obj || !obj->nr_tlb_entries || !e)
> return -EINVAL;
>
> - clk_enable(obj->clk);
> + pm_runtime_get_sync(obj->dev);
>
> iotlb_lock_get(obj, &l);
> if (l.base == obj->nr_tlb_entries) {
> @@ -318,7 +315,7 @@ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
>
> cr = iotlb_alloc_cr(obj, e);
> if (IS_ERR(cr)) {
> - clk_disable(obj->clk);
> + pm_runtime_put_sync(obj->dev);
> return PTR_ERR(cr);
> }
If I'm correct, the above pm_runtime_get/put are redundant, because
the count can't possibly reach 0 because of the reason I explained
before.
The same for all the cases below.
> @@ -1009,7 +1001,8 @@ static int __devexit omap_iommu_remove(struct platform_device *pdev)
> release_mem_region(res->start, resource_size(res));
> iounmap(obj->regbase);
>
> - clk_put(obj->clk);
> + pm_runtime_disable(obj->dev);
This will turn on the device unnecessarily, wasting power, and there's
no need for that, kfree will take care of that without resuming.
> dev_info(&pdev->dev, "%s removed\n", obj->name);
> kfree(obj);
> return 0;
Also, I still think that something like this is needed:
--- a/arch/arm/mach-omap2/clock3xxx_data.c
+++ b/arch/arm/mach-omap2/clock3xxx_data.c
@@ -2222,8 +2222,17 @@ static struct clk cam_mclk = {
.recalc = &followparent_recalc,
};
+static struct clk cam_fck = {
+ .name = "cam_fck",
+ .ops = &clkops_omap2_iclk_dflt,
+ .parent = &l3_ick,
+ .enable_reg = OMAP_CM_REGADDR(OMAP3430_CAM_MOD, CM_ICLKEN),
+ .enable_bit = OMAP3430_EN_CAM_SHIFT,
+ .clkdm_name = "cam_clkdm",
+ .recalc = &followparent_recalc,
+};
+
static struct clk cam_ick = {
- /* Handles both L3 and L4 clocks */
.name = "cam_ick",
.ops = &clkops_omap2_iclk_dflt,
.parent = &l4_ick,
@@ -3394,6 +3403,7 @@ static struct omap_clk omap3xxx_clks[] = {
CLK("omapdss_dss", "ick", &dss_ick_3430es2,
CK_3430ES2PLUS | CK_AM35XX | CK_36XX),
CLK(NULL, "dss_ick", &dss_ick_3430es2,
CK_3430ES2PLUS | CK_AM35XX | CK_36XX),
CLK(NULL, "cam_mclk", &cam_mclk, CK_34XX | CK_36XX),
+ CLK(NULL, "cam_fck", &cam_fck, CK_34XX | CK_36XX),
CLK(NULL, "cam_ick", &cam_ick, CK_34XX | CK_36XX),
CLK(NULL, "csi2_96m_fck", &csi2_96m_fck, CK_34XX | CK_36XX),
CLK(NULL, "usbhost_120m_fck", &usbhost_120m_fck,
CK_3430ES2PLUS | CK_AM35XX | CK_36XX),
Cheers.
--
Felipe Contreras
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