kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 159 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/734-v5.5-net-sfp-move-module-insert-reporting-out-of-probe.patch b/target/linux/generic/backport-5.4/734-v5.5-net-sfp-move-module-insert-reporting-out-of-probe.patch
new file mode 100644
index 0000000000..26b6a6b0e4
--- /dev/null
+++ b/target/linux/generic/backport-5.4/734-v5.5-net-sfp-move-module-insert-reporting-out-of-probe.patch
@@ -0,0 +1,159 @@
+From 57cbf7453551db1df619b79410d79fc418d862d5 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Tue, 5 Nov 2019 13:00:45 +0000
+Subject: [PATCH 632/660] net: sfp: move module insert reporting out of probe
+
+Move the module insertion reporting out of the probe handling, but
+after we have detected that the upstream has attached (since that is
+whom we are reporting insertion to.)
+
+Only report module removal if we had previously reported a module
+insertion.
+
+This gives cleaner semantics, and means we can probe the module before
+we have an upstream attached.
+
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+---
+ drivers/net/phy/sfp.c | 58 +++++++++++++++++++++++++++++--------------
+ 1 file changed, 40 insertions(+), 18 deletions(-)
+
+--- a/drivers/net/phy/sfp.c
++++ b/drivers/net/phy/sfp.c
+@@ -45,11 +45,12 @@ enum {
+ 	SFP_E_TIMEOUT,
+ 
+ 	SFP_MOD_EMPTY = 0,
++	SFP_MOD_ERROR,
+ 	SFP_MOD_PROBE,
++	SFP_MOD_WAITDEV,
+ 	SFP_MOD_HPOWER,
+ 	SFP_MOD_WAITPWR,
+ 	SFP_MOD_PRESENT,
+-	SFP_MOD_ERROR,
+ 
+ 	SFP_DEV_DETACHED = 0,
+ 	SFP_DEV_DOWN,
+@@ -68,11 +69,12 @@ enum {
+ 
+ static const char  * const mod_state_strings[] = {
+ 	[SFP_MOD_EMPTY] = "empty",
++	[SFP_MOD_ERROR] = "error",
+ 	[SFP_MOD_PROBE] = "probe",
++	[SFP_MOD_WAITDEV] = "waitdev",
+ 	[SFP_MOD_HPOWER] = "hpower",
+ 	[SFP_MOD_WAITPWR] = "waitpwr",
+ 	[SFP_MOD_PRESENT] = "present",
+-	[SFP_MOD_ERROR] = "error",
+ };
+ 
+ static const char *mod_state_to_str(unsigned short mod_state)
+@@ -1479,16 +1481,13 @@ static int sfp_sm_mod_probe(struct sfp *
+ 	if (ret < 0)
+ 		return ret;
+ 
+-	ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
+-	if (ret < 0)
+-		return ret;
+-
+ 	return 0;
+ }
+ 
+ static void sfp_sm_mod_remove(struct sfp *sfp)
+ {
+-	sfp_module_remove(sfp->sfp_bus);
++	if (sfp->sm_mod_state > SFP_MOD_WAITDEV)
++		sfp_module_remove(sfp->sfp_bus);
+ 
+ 	sfp_hwmon_remove(sfp);
+ 
+@@ -1539,12 +1538,12 @@ static void sfp_sm_module(struct sfp *sf
+ 	}
+ 
+ 	/* Handle device detach globally */
+-	if (sfp->sm_dev_state < SFP_DEV_DOWN) {
++	if (sfp->sm_dev_state < SFP_DEV_DOWN &&
++	    sfp->sm_mod_state > SFP_MOD_WAITDEV) {
+ 		if (sfp->module_power_mW > 1000 &&
+ 		    sfp->sm_mod_state > SFP_MOD_HPOWER)
+ 			sfp_sm_mod_hpower(sfp, false);
+-		if (sfp->sm_mod_state > SFP_MOD_EMPTY)
+-			sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
++		sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
+ 		return;
+ 	}
+ 
+@@ -1555,6 +1554,7 @@ static void sfp_sm_module(struct sfp *sf
+ 		break;
+ 
+ 	case SFP_MOD_PROBE:
++		/* Wait for T_PROBE_INIT to time out */
+ 		if (event != SFP_E_TIMEOUT)
+ 			break;
+ 
+@@ -1568,6 +1568,20 @@ static void sfp_sm_module(struct sfp *sf
+ 			break;
+ 		}
+ 
++		sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
++		/* fall through */
++	case SFP_MOD_WAITDEV:
++		/* Ensure that the device is attached before proceeding */
++		if (sfp->sm_dev_state < SFP_DEV_DOWN)
++			break;
++
++		/* Report the module insertion to the upstream device */
++		err = sfp_module_insert(sfp->sfp_bus, &sfp->id);
++		if (err < 0) {
++			sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
++			break;
++		}
++
+ 		/* If this is a power level 1 module, we are done */
+ 		if (sfp->module_power_mW <= 1000)
+ 			goto insert;
+@@ -1577,12 +1591,17 @@ static void sfp_sm_module(struct sfp *sf
+ 	case SFP_MOD_HPOWER:
+ 		/* Enable high power mode */
+ 		err = sfp_sm_mod_hpower(sfp, true);
+-		if (err == 0)
+-			sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
+-		else if (err != -EAGAIN)
+-			sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
+-		else
+-			sfp_sm_set_timer(sfp, T_PROBE_RETRY);
++		if (err < 0) {
++			if (err != -EAGAIN) {
++				sfp_module_remove(sfp->sfp_bus);
++				sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
++			} else {
++				sfp_sm_set_timer(sfp, T_PROBE_RETRY);
++			}
++			break;
++		}
++
++		sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
+ 		break;
+ 
+ 	case SFP_MOD_WAITPWR:
+@@ -1750,8 +1769,6 @@ static void sfp_sm_event(struct sfp *sfp
+ static void sfp_attach(struct sfp *sfp)
+ {
+ 	sfp_sm_event(sfp, SFP_E_DEV_ATTACH);
+-	if (sfp->state & SFP_F_PRESENT)
+-		sfp_sm_event(sfp, SFP_E_INSERT);
+ }
+ 
+ static void sfp_detach(struct sfp *sfp)
+@@ -2001,6 +2018,11 @@ static int sfp_probe(struct platform_dev
+ 		sfp->state |= SFP_F_RATE_SELECT;
+ 	sfp_set_state(sfp, sfp->state);
+ 	sfp_module_tx_disable(sfp);
++	if (sfp->state & SFP_F_PRESENT) {
++		rtnl_lock();
++		sfp_sm_event(sfp, SFP_E_INSERT);
++		rtnl_unlock();
++	}
+ 
+ 	for (i = 0; i < GPIO_MAX; i++) {
+ 		if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])