Merge branch 'revert-fec-ptp-changes'

Francesco Dolcini says:

====================
Revert fec PTP changes

Revert the last 2 FEC PTP changes from Csókás Bence, they are causing multiple
issues and we are at 6.0-rc5.
====================

Link: https://lore.kernel.org/r/20220912070143.98153-1-francesco.dolcini@toradex.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

3 files changed, 31 insertions, 96 deletions

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index d77ee8936c6a3a..a5fed00cb971fc 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -561,6 +561,7 @@ struct fec_enet_private {
 	struct clk *clk_2x_txclk;
 
 	bool ptp_clk_on;
+	struct mutex ptp_clk_mutex;
 	unsigned int num_tx_queues;
 	unsigned int num_rx_queues;
 
@@ -638,13 +639,6 @@ struct fec_enet_private {
 	int pps_enable;
 	unsigned int next_counter;
 
-	struct {
-		struct timespec64 ts_phc;
-		u64 ns_sys;
-		u32 at_corr;
-		u8 at_inc_corr;
-	} ptp_saved_state;
-
 	u64 ethtool_stats[];
 };
 
@@ -655,8 +649,5 @@ void fec_ptp_disable_hwts(struct net_device *ndev);
 int fec_ptp_set(struct net_device *ndev, struct ifreq *ifr);
 int fec_ptp_get(struct net_device *ndev, struct ifreq *ifr);
 
-void fec_ptp_save_state(struct fec_enet_private *fep);
-int fec_ptp_restore_state(struct fec_enet_private *fep);
-
 /****************************************************************************/
 #endif /* FEC_H */
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 6152f6dbf1bcf4..92c55e1a55076f 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -286,11 +286,8 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
 #define FEC_MMFR_TA		(2 << 16)
 #define FEC_MMFR_DATA(v)	(v & 0xffff)
 /* FEC ECR bits definition */
-#define FEC_ECR_RESET   BIT(0)
-#define FEC_ECR_ETHEREN BIT(1)
-#define FEC_ECR_MAGICEN BIT(2)
-#define FEC_ECR_SLEEP   BIT(3)
-#define FEC_ECR_EN1588  BIT(4)
+#define FEC_ECR_MAGICEN		(1 << 2)
+#define FEC_ECR_SLEEP		(1 << 3)
 
 #define FEC_MII_TIMEOUT		30000 /* us */
 
@@ -986,9 +983,6 @@ fec_restart(struct net_device *ndev)
 	u32 temp_mac[2];
 	u32 rcntl = OPT_FRAME_SIZE | 0x04;
 	u32 ecntl = 0x2; /* ETHEREN */
-	struct ptp_clock_request ptp_rq = { .type = PTP_CLK_REQ_PPS };
-
-	fec_ptp_save_state(fep);
 
 	/* Whack a reset.  We should wait for this.
 	 * For i.MX6SX SOC, enet use AXI bus, we use disable MAC
@@ -1142,7 +1136,7 @@ fec_restart(struct net_device *ndev)
 	}
 
 	if (fep->bufdesc_ex)
-		ecntl |= FEC_ECR_EN1588;
+		ecntl |= (1 << 4);
 
 	if (fep->quirks & FEC_QUIRK_DELAYED_CLKS_SUPPORT &&
 	    fep->rgmii_txc_dly)
@@ -1163,14 +1157,6 @@ fec_restart(struct net_device *ndev)
 	if (fep->bufdesc_ex)
 		fec_ptp_start_cyclecounter(ndev);
 
-	/* Restart PPS if needed */
-	if (fep->pps_enable) {
-		/* Clear flag so fec_ptp_enable_pps() doesn't return immediately */
-		fep->pps_enable = 0;
-		fec_ptp_restore_state(fep);
-		fep->ptp_caps.enable(&fep->ptp_caps, &ptp_rq, 1);
-	}
-
 	/* Enable interrupts we wish to service */
 	if (fep->link)
 		writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
@@ -1221,8 +1207,6 @@ fec_stop(struct net_device *ndev)
 	struct fec_enet_private *fep = netdev_priv(ndev);
 	u32 rmii_mode = readl(fep->hwp + FEC_R_CNTRL) & (1 << 8);
 	u32 val;
-	struct ptp_clock_request ptp_rq = { .type = PTP_CLK_REQ_PPS };
-	u32 ecntl = 0;
 
 	/* We cannot expect a graceful transmit stop without link !!! */
 	if (fep->link) {
@@ -1232,8 +1216,6 @@ fec_stop(struct net_device *ndev)
 			netdev_err(ndev, "Graceful transmit stop did not complete!\n");
 	}
 
-	fec_ptp_save_state(fep);
-
 	/* Whack a reset.  We should wait for this.
 	 * For i.MX6SX SOC, enet use AXI bus, we use disable MAC
 	 * instead of reset MAC itself.
@@ -1253,28 +1235,12 @@ fec_stop(struct net_device *ndev)
 	writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
 	writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
 
-	if (fep->bufdesc_ex)
-		ecntl |= FEC_ECR_EN1588;
-
 	/* We have to keep ENET enabled to have MII interrupt stay working */
 	if (fep->quirks & FEC_QUIRK_ENET_MAC &&
 		!(fep->wol_flag & FEC_WOL_FLAG_SLEEP_ON)) {
-		ecntl |= FEC_ECR_ETHEREN;
+		writel(2, fep->hwp + FEC_ECNTRL);
 		writel(rmii_mode, fep->hwp + FEC_R_CNTRL);
 	}
-
-	writel(ecntl, fep->hwp + FEC_ECNTRL);
-
-	if (fep->bufdesc_ex)
-		fec_ptp_start_cyclecounter(ndev);
-
-	/* Restart PPS if needed */
-	if (fep->pps_enable) {
-		/* Clear flag so fec_ptp_enable_pps() doesn't return immediately */
-		fep->pps_enable = 0;
-		fec_ptp_restore_state(fep);
-		fep->ptp_caps.enable(&fep->ptp_caps, &ptp_rq, 1);
-	}
 }
 
 
@@ -2029,7 +1995,6 @@ static void fec_enet_phy_reset_after_clk_enable(struct net_device *ndev)
 static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
-	unsigned long flags;
 	int ret;
 
 	if (enable) {
@@ -2038,15 +2003,15 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
 			return ret;
 
 		if (fep->clk_ptp) {
-			spin_lock_irqsave(&fep->tmreg_lock, flags);
+			mutex_lock(&fep->ptp_clk_mutex);
 			ret = clk_prepare_enable(fep->clk_ptp);
 			if (ret) {
-				spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+				mutex_unlock(&fep->ptp_clk_mutex);
 				goto failed_clk_ptp;
 			} else {
 				fep->ptp_clk_on = true;
 			}
-			spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+			mutex_unlock(&fep->ptp_clk_mutex);
 		}
 
 		ret = clk_prepare_enable(fep->clk_ref);
@@ -2061,10 +2026,10 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
 	} else {
 		clk_disable_unprepare(fep->clk_enet_out);
 		if (fep->clk_ptp) {
-			spin_lock_irqsave(&fep->tmreg_lock, flags);
+			mutex_lock(&fep->ptp_clk_mutex);
 			clk_disable_unprepare(fep->clk_ptp);
 			fep->ptp_clk_on = false;
-			spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+			mutex_unlock(&fep->ptp_clk_mutex);
 		}
 		clk_disable_unprepare(fep->clk_ref);
 		clk_disable_unprepare(fep->clk_2x_txclk);
@@ -2077,10 +2042,10 @@ failed_clk_2x_txclk:
 		clk_disable_unprepare(fep->clk_ref);
 failed_clk_ref:
 	if (fep->clk_ptp) {
-		spin_lock_irqsave(&fep->tmreg_lock, flags);
+		mutex_lock(&fep->ptp_clk_mutex);
 		clk_disable_unprepare(fep->clk_ptp);
 		fep->ptp_clk_on = false;
-		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+		mutex_unlock(&fep->ptp_clk_mutex);
 	}
 failed_clk_ptp:
 	clk_disable_unprepare(fep->clk_enet_out);
@@ -3915,7 +3880,7 @@ fec_probe(struct platform_device *pdev)
 	}
 
 	fep->ptp_clk_on = false;
-	spin_lock_init(&fep->tmreg_lock);
+	mutex_init(&fep->ptp_clk_mutex);
 
 	/* clk_ref is optional, depends on board */
 	fep->clk_ref = devm_clk_get_optional(&pdev->dev, "enet_clk_ref");
diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index 8dd5a2615a89f3..3dc3c0b626c21c 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -365,19 +365,21 @@ static int fec_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
  */
 static int fec_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
 {
-	struct fec_enet_private *fep =
+	struct fec_enet_private *adapter =
 	    container_of(ptp, struct fec_enet_private, ptp_caps);
 	u64 ns;
 	unsigned long flags;
 
-	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	mutex_lock(&adapter->ptp_clk_mutex);
 	/* Check the ptp clock */
-	if (!fep->ptp_clk_on) {
-		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	if (!adapter->ptp_clk_on) {
+		mutex_unlock(&adapter->ptp_clk_mutex);
 		return -EINVAL;
 	}
-	ns = timecounter_read(&fep->tc);
-	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	spin_lock_irqsave(&adapter->tmreg_lock, flags);
+	ns = timecounter_read(&adapter->tc);
+	spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+	mutex_unlock(&adapter->ptp_clk_mutex);
 
 	*ts = ns_to_timespec64(ns);
 
@@ -402,10 +404,10 @@ static int fec_ptp_settime(struct ptp_clock_info *ptp,
 	unsigned long flags;
 	u32 counter;
 
-	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	mutex_lock(&fep->ptp_clk_mutex);
 	/* Check the ptp clock */
 	if (!fep->ptp_clk_on) {
-		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+		mutex_unlock(&fep->ptp_clk_mutex);
 		return -EINVAL;
 	}
 
@@ -415,9 +417,11 @@ static int fec_ptp_settime(struct ptp_clock_info *ptp,
 	 */
 	counter = ns & fep->cc.mask;
 
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
 	writel(counter, fep->hwp + FEC_ATIME);
 	timecounter_init(&fep->tc, &fep->cc, ns);
 	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	mutex_unlock(&fep->ptp_clk_mutex);
 	return 0;
 }
 
@@ -514,11 +518,13 @@ static void fec_time_keep(struct work_struct *work)
 	struct fec_enet_private *fep = container_of(dwork, struct fec_enet_private, time_keep);
 	unsigned long flags;
 
-	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	mutex_lock(&fep->ptp_clk_mutex);
 	if (fep->ptp_clk_on) {
+		spin_lock_irqsave(&fep->tmreg_lock, flags);
 		timecounter_read(&fep->tc);
+		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
 	}
-	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	mutex_unlock(&fep->ptp_clk_mutex);
 
 	schedule_delayed_work(&fep->time_keep, HZ);
 }
@@ -593,6 +599,8 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 	}
 	fep->ptp_inc = NSEC_PER_SEC / fep->cycle_speed;
 
+	spin_lock_init(&fep->tmreg_lock);
+
 	fec_ptp_start_cyclecounter(ndev);
 
 	INIT_DELAYED_WORK(&fep->time_keep, fec_time_keep);
@@ -625,36 +633,7 @@ void fec_ptp_stop(struct platform_device *pdev)
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct fec_enet_private *fep = netdev_priv(ndev);
 
-	if (fep->pps_enable)
-		fec_ptp_enable_pps(fep, 0);
-
 	cancel_delayed_work_sync(&fep->time_keep);
 	if (fep->ptp_clock)
 		ptp_clock_unregister(fep->ptp_clock);
 }
-
-void fec_ptp_save_state(struct fec_enet_private *fep)
-{
-	u32 atime_inc_corr;
-
-	fec_ptp_gettime(&fep->ptp_caps, &fep->ptp_saved_state.ts_phc);
-	fep->ptp_saved_state.ns_sys = ktime_get_ns();
-
-	fep->ptp_saved_state.at_corr = readl(fep->hwp + FEC_ATIME_CORR);
-	atime_inc_corr = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_CORR_MASK;
-	fep->ptp_saved_state.at_inc_corr = (u8)(atime_inc_corr >> FEC_T_INC_CORR_OFFSET);
-}
-
-int fec_ptp_restore_state(struct fec_enet_private *fep)
-{
-	u32 atime_inc = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_MASK;
-	u64 ns_sys;
-
-	writel(fep->ptp_saved_state.at_corr, fep->hwp + FEC_ATIME_CORR);
-	atime_inc |= ((u32)fep->ptp_saved_state.at_inc_corr) << FEC_T_INC_CORR_OFFSET;
-	writel(atime_inc, fep->hwp + FEC_ATIME_INC);
-
-	ns_sys = ktime_get_ns() - fep->ptp_saved_state.ns_sys;
-	timespec64_add_ns(&fep->ptp_saved_state.ts_phc, ns_sys);
-	return fec_ptp_settime(&fep->ptp_caps, &fep->ptp_saved_state.ts_phc);
-}