clk: imx95-blk-ctl: Fix synchronous abort

When enabling runtime PM for clock suppliers that also belong to a power
domain, the following crash is thrown:
error: synchronous external abort: 0000000096000010 [#1] PREEMPT SMP
Workqueue: events_unbound deferred_probe_work_func
pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : clk_mux_get_parent+0x60/0x90
lr : clk_core_reparent_orphans_nolock+0x58/0xd8
  Call trace:
   clk_mux_get_parent+0x60/0x90
   clk_core_reparent_orphans_nolock+0x58/0xd8
   of_clk_add_hw_provider.part.0+0x90/0x100
   of_clk_add_hw_provider+0x1c/0x38
   imx95_bc_probe+0x2e0/0x3f0
   platform_probe+0x70/0xd8

Enabling runtime PM without explicitly resuming the device caused
the power domain cut off after clk_register() is called. As a result,
a crash happens when the clock hardware provider is added and attempts
to access the BLK_CTL register.

Fix this by using devm_pm_runtime_enable() instead of pm_runtime_enable()
and getting rid of the pm_runtime_disable() in the cleanup path.

Fixes: 5224b189462f ("clk: imx: add i.MX95 BLK CTL clk driver")
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20250707-imx95-blk-ctl-7-1-v3-2-c1b676ec13be@nxp.com
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>

diff --git a/drivers/clk/imx/clk-imx95-blk-ctl.c b/drivers/clk/imx/clk-imx95-blk-ctl.c
index cc2ee2be18195f0e05e911bcb26e284b1a894244..86bdcd21753102b7d160288e7b69bf73da5a5706 100644 (file)
--- a/drivers/clk/imx/clk-imx95-blk-ctl.c
+++ b/drivers/clk/imx/clk-imx95-blk-ctl.c
@@ -342,8 +342,10 @@ static int imx95_bc_probe(struct platform_device *pdev)
        if (!clk_hw_data)
                return -ENOMEM;
 
-       if (bc_data->rpm_enabled)
-               pm_runtime_enable(&pdev->dev);
+       if (bc_data->rpm_enabled) {
+               devm_pm_runtime_enable(&pdev->dev);
+               pm_runtime_resume_and_get(&pdev->dev);
+       }
 
        clk_hw_data->num = bc_data->num_clks;
        hws = clk_hw_data->hws;
@@ -383,8 +385,10 @@ static int imx95_bc_probe(struct platform_device *pdev)
                goto cleanup;
        }
 
-       if (pm_runtime_enabled(bc->dev))
+       if (pm_runtime_enabled(bc->dev)) {
+               pm_runtime_put_sync(&pdev->dev);
                clk_disable_unprepare(bc->clk_apb);
+       }
 
        return 0;
 
@@ -395,9 +399,6 @@ cleanup:
                clk_hw_unregister(hws[i]);
        }
 
-       if (bc_data->rpm_enabled)
-               pm_runtime_disable(&pdev->dev);
-
        return ret;
 }