ice: Fix improper extts handling

Extts events are disabled and enabled by the application ts2phc.
However, in case where the driver is removed when the application is
running, a specific extts event remains enabled and can cause a kernel
crash.
As a side effect, when the driver is reloaded and application is started
again, remaining extts event for the channel from a previous run will
keep firing and the message "extts on unexpected channel" might be
printed to the user.

To avoid that, extts events shall be disabled when PTP is released.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Co-developed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20240702171459.2606611-2-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 3af20025043a..f1171cdd93c8 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -33,6 +33,12 @@ struct ice_perout_channel {
 	u64 start_time;
 };
 
+struct ice_extts_channel {
+	bool ena;
+	u32 gpio_pin;
+	u32 flags;
+};
+
 /* The ice hardware captures Tx hardware timestamps in the PHY. The timestamp
  * is stored in a buffer of registers. Depending on the specific hardware,
  * this buffer might be shared across multiple PHY ports.
@@ -226,6 +232,7 @@ enum ice_ptp_state {
  * @ext_ts_irq: the external timestamp IRQ in use
  * @kworker: kwork thread for handling periodic work
  * @perout_channels: periodic output data
+ * @extts_channels: channels for external timestamps
  * @info: structure defining PTP hardware capabilities
  * @clock: pointer to registered PTP clock device
  * @tstamp_config: hardware timestamping configuration
@@ -249,6 +256,7 @@ struct ice_ptp {
 	u8 ext_ts_irq;
 	struct kthread_worker *kworker;
 	struct ice_perout_channel perout_channels[GLTSYN_TGT_H_IDX_MAX];
+	struct ice_extts_channel extts_channels[GLTSYN_TGT_H_IDX_MAX];
 	struct ptp_clock_info info;
 	struct ptp_clock *clock;
 	struct hwtstamp_config tstamp_config;