diff mbox series

[net-next,v5,2/2] net: ethernet: ti: am65-cpsw/cpts: Fix CPTS release action

Message ID 20230120070731.383729-3-s-vadapalli@ti.com (mailing list archive)
State Accepted
Commit 4ad8766cd3982744e53f107f378d2c65b76ff9a8
Delegated to: Netdev Maintainers
Headers show
Series Fix CPTS release action in am65-cpts driver | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers fail 1 blamed authors not CCed: grygorii.strashko@ti.com; 1 maintainers not CCed: grygorii.strashko@ti.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 74 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Siddharth Vadapalli Jan. 20, 2023, 7:07 a.m. UTC
The am65_cpts_release() function is registered as a devm_action in the
am65_cpts_create() function in am65-cpts driver. When the am65-cpsw driver
invokes am65_cpts_create(), am65_cpts_release() is added in the set of devm
actions associated with the am65-cpsw driver's device.

In the event of probe failure or probe deferral, the platform_drv_probe()
function invokes dev_pm_domain_detach() which powers off the CPSW and the
CPSW's CPTS hardware, both of which share the same power domain. Since the
am65_cpts_disable() function invoked by the am65_cpts_release() function
attempts to reset the CPTS hardware by writing to its registers, the CPTS
hardware is assumed to be powered on at this point. However, the hardware
is powered off before the devm actions are executed.

Fix this by getting rid of the devm action for am65_cpts_release() and
invoking it directly on the cleanup and exit paths.

Fixes: f6bd59526ca5 ("net: ethernet: ti: introduce am654 common platform time sync driver")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c |  2 ++
 drivers/net/ethernet/ti/am65-cpts.c      | 15 +++++----------
 drivers/net/ethernet/ti/am65-cpts.h      |  5 +++++
 3 files changed, 12 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index fde4800cf81a..b23027874cc4 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2914,6 +2914,7 @@  static int am65_cpsw_nuss_probe(struct platform_device *pdev)
 
 err_free_phylink:
 	am65_cpsw_nuss_phylink_cleanup(common);
+	am65_cpts_release(common->cpts);
 err_of_clear:
 	of_platform_device_destroy(common->mdio_dev, NULL);
 err_pm_clear:
@@ -2942,6 +2943,7 @@  static int am65_cpsw_nuss_remove(struct platform_device *pdev)
 	 */
 	am65_cpsw_nuss_cleanup_ndev(common);
 	am65_cpsw_nuss_phylink_cleanup(common);
+	am65_cpts_release(common->cpts);
 	am65_cpsw_disable_serdes_phy(common);
 
 	of_platform_device_destroy(common->mdio_dev, NULL);
diff --git a/drivers/net/ethernet/ti/am65-cpts.c b/drivers/net/ethernet/ti/am65-cpts.c
index bf0f74b20ba6..16ee9c29cb35 100644
--- a/drivers/net/ethernet/ti/am65-cpts.c
+++ b/drivers/net/ethernet/ti/am65-cpts.c
@@ -1052,14 +1052,13 @@  static int am65_cpts_of_parse(struct am65_cpts *cpts, struct device_node *node)
 	return cpts_of_mux_clk_setup(cpts, node);
 }
 
-static void am65_cpts_release(void *data)
+void am65_cpts_release(struct am65_cpts *cpts)
 {
-	struct am65_cpts *cpts = data;
-
 	ptp_clock_unregister(cpts->ptp_clock);
 	am65_cpts_disable(cpts);
 	clk_disable_unprepare(cpts->refclk);
 }
+EXPORT_SYMBOL_GPL(am65_cpts_release);
 
 struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
 				   struct device_node *node)
@@ -1139,18 +1138,12 @@  struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
 	}
 	cpts->phc_index = ptp_clock_index(cpts->ptp_clock);
 
-	ret = devm_add_action_or_reset(dev, am65_cpts_release, cpts);
-	if (ret) {
-		dev_err(dev, "failed to add ptpclk reset action %d", ret);
-		return ERR_PTR(ret);
-	}
-
 	ret = devm_request_threaded_irq(dev, cpts->irq, NULL,
 					am65_cpts_interrupt,
 					IRQF_ONESHOT, dev_name(dev), cpts);
 	if (ret < 0) {
 		dev_err(cpts->dev, "error attaching irq %d\n", ret);
-		return ERR_PTR(ret);
+		goto reset_ptpclk;
 	}
 
 	dev_info(dev, "CPTS ver 0x%08x, freq:%u, add_val:%u pps:%d\n",
@@ -1159,6 +1152,8 @@  struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
 
 	return cpts;
 
+reset_ptpclk:
+	am65_cpts_release(cpts);
 refclk_disable:
 	clk_disable_unprepare(cpts->refclk);
 	return ERR_PTR(ret);
diff --git a/drivers/net/ethernet/ti/am65-cpts.h b/drivers/net/ethernet/ti/am65-cpts.h
index bd08f4b2edd2..6e14df0be113 100644
--- a/drivers/net/ethernet/ti/am65-cpts.h
+++ b/drivers/net/ethernet/ti/am65-cpts.h
@@ -18,6 +18,7 @@  struct am65_cpts_estf_cfg {
 };
 
 #if IS_ENABLED(CONFIG_TI_K3_AM65_CPTS)
+void am65_cpts_release(struct am65_cpts *cpts);
 struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
 				   struct device_node *node);
 int am65_cpts_phc_index(struct am65_cpts *cpts);
@@ -31,6 +32,10 @@  void am65_cpts_estf_disable(struct am65_cpts *cpts, int idx);
 void am65_cpts_suspend(struct am65_cpts *cpts);
 void am65_cpts_resume(struct am65_cpts *cpts);
 #else
+static inline void am65_cpts_release(struct am65_cpts *cpts)
+{
+}
+
 static inline struct am65_cpts *am65_cpts_create(struct device *dev,
 						 void __iomem *regs,
 						 struct device_node *node)