kernel: backport some upstream at803x fixes

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2016-11-29 17:55:41 +01:00
parent 566de813c3
commit 06a21e12ee
3 changed files with 162 additions and 0 deletions

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@ -0,0 +1,43 @@
From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Wed, 23 Mar 2016 00:44:40 +0300
Subject: [PATCH] at803x: fix reset handling
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The driver of course "knows" that the chip's reset signal is active low,
so it drives the GPIO to 0 to reset the PHY and to 1 otherwise; however
all this will only work iff the GPIO is specified as active-high in the
device tree! I think both the driver and the device trees (if there are
any -- I was unable to find them) need to be fixed in this case...
Fixes: 13a56b449325 ("net: phy: at803x: Add support for hardware reset")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -250,7 +250,7 @@ static int at803x_probe(struct phy_devic
if (!priv)
return -ENOMEM;
- gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpiod_reset))
return PTR_ERR(gpiod_reset);
@@ -377,10 +377,10 @@ static void at803x_link_change_notify(st
at803x_context_save(phydev, &context);
- gpiod_set_value(priv->gpiod_reset, 0);
- msleep(1);
gpiod_set_value(priv->gpiod_reset, 1);
msleep(1);
+ gpiod_set_value(priv->gpiod_reset, 0);
+ msleep(1);
at803x_context_restore(phydev, &context);

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From: Sebastian Frias <sf84@laposte.net>
Date: Wed, 23 Mar 2016 11:49:09 +0100
Subject: [PATCH] net: phy: at803x: Request 'reset' GPIO only for AT8030 PHY
This removes the dependency on GPIOLIB for non faulty PHYs.
Indeed, without this patch, if GPIOLIB is not selected
devm_gpiod_get_optional() will return -ENOSYS and the driver probe
call will fail, regardless of the actual PHY hardware.
Out of the 3 PHYs supported by this driver (AT8030, AT8031, AT8035),
only AT8030 presents the issues that commit 13a56b449325 ("net: phy:
at803x: Add support for hardware reset") attempts to work-around by
using a 'reset' GPIO line.
Hence, only AT8030 should depend on GPIOLIB operating properly.
Fixes: 13a56b449325 ("net: phy: at803x: Add support for hardware reset")
Signed-off-by: Sebastian Frias <sf84@laposte.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -250,12 +250,16 @@ static int at803x_probe(struct phy_devic
if (!priv)
return -ENOMEM;
+ if (phydev->drv->phy_id != ATH8030_PHY_ID)
+ goto does_not_require_reset_workaround;
+
gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpiod_reset))
return PTR_ERR(gpiod_reset);
priv->gpiod_reset = gpiod_reset;
+does_not_require_reset_workaround:
phydev->priv = priv;
return 0;

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@ -0,0 +1,77 @@
From: Timur Tabi <timur@codeaurora.org>
Date: Tue, 26 Apr 2016 12:44:18 -0500
Subject: [PATCH] net: phy: at803x: only the AT8030 needs a hardware reset on
link change
Commit 13a56b44 ("at803x: Add support for hardware reset") added a
work-around for a hardware bug on the AT8030. However, the work-around
was being called for all 803x PHYs, even those that don't need it.
Function at803x_link_change_notify() checks to make sure that it only
resets the PHY on the 8030, but it makes more sense to not call that
function at all if it isn't needed.
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -374,27 +374,25 @@ static void at803x_link_change_notify(st
* in the FIFO. In such cases, the FIFO enters an error mode it
* cannot recover from by software.
*/
- if (phydev->drv->phy_id == ATH8030_PHY_ID) {
- if (phydev->state == PHY_NOLINK) {
- if (priv->gpiod_reset && !priv->phy_reset) {
- struct at803x_context context;
+ if (phydev->state == PHY_NOLINK) {
+ if (priv->gpiod_reset && !priv->phy_reset) {
+ struct at803x_context context;
- at803x_context_save(phydev, &context);
+ at803x_context_save(phydev, &context);
- gpiod_set_value(priv->gpiod_reset, 1);
- msleep(1);
- gpiod_set_value(priv->gpiod_reset, 0);
- msleep(1);
+ gpiod_set_value(priv->gpiod_reset, 1);
+ msleep(1);
+ gpiod_set_value(priv->gpiod_reset, 0);
+ msleep(1);
- at803x_context_restore(phydev, &context);
+ at803x_context_restore(phydev, &context);
- dev_dbg(&phydev->dev, "%s(): phy was reset\n",
- __func__);
- priv->phy_reset = true;
- }
- } else {
- priv->phy_reset = false;
+ dev_dbg(&phydev->dev, "%s(): phy was reset\n",
+ __func__);
+ priv->phy_reset = true;
}
+ } else {
+ priv->phy_reset = false;
}
if (pdata && pdata->fixup_rgmii_tx_delay &&
phydev->speed != priv->prev_speed) {
@@ -426,7 +424,6 @@ static struct phy_driver at803x_driver[]
.phy_id_mask = AT803X_PHY_ID_MASK,
.probe = at803x_probe,
.config_init = at803x_config_init,
- .link_change_notify = at803x_link_change_notify,
.set_wol = at803x_set_wol,
.get_wol = at803x_get_wol,
.suspend = at803x_suspend,
@@ -468,7 +465,6 @@ static struct phy_driver at803x_driver[]
.phy_id_mask = AT803X_PHY_ID_MASK,
.probe = at803x_probe,
.config_init = at803x_config_init,
- .link_change_notify = at803x_link_change_notify,
.set_wol = at803x_set_wol,
.get_wol = at803x_get_wol,
.suspend = at803x_suspend,