MIPS: lantiq: gphy: Drop reboot/remove reset asserts

BugLink: http://bugs.launchpad.net/bugs/1788897
commit 32795631e67e16141aa5e065c28ba03bf17abb90 upstream.

While doing a global software reset, these bits are not cleared and let
some bootloader fail to initialise the GPHYs. The bootloader don't
expect the GPHYs in reset, as they aren't during power on.

The asserts were a workaround for a wrong syscon-reboot mask. With a
mask set which includes the GPHY resets, these resets aren't required
any more.

Fixes: 126534141b45 ("MIPS: lantiq: Add a GPHY driver which uses the RCU syscon-mfd")
Signed-off-by: Mathias Kresin <dev@kresin.me>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 4.14+
Patchwork: https://patchwork.linux-mips.org/patch/19003/
[jhogan@kernel.org: Fix build warnings]
Signed-off-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/soc/lantiq/gphy.c b/drivers/soc/lantiq/gphy.c
index 8d8659463b3e85f4e1513007dde398ced1bc3e6a..feeb17cebc25e98973dd73160d2118c5cc205dcb 100644 (file)
--- a/drivers/soc/lantiq/gphy.c
+++ b/drivers/soc/lantiq/gphy.c
@@ -30,7 +30,6 @@ struct xway_gphy_priv {
        struct clk *gphy_clk_gate;
        struct reset_control *gphy_reset;
        struct reset_control *gphy_reset2;
-       struct notifier_block gphy_reboot_nb;
        void __iomem *membase;
        char *fw_name;
 };
@@ -64,24 +63,6 @@ static const struct of_device_id xway_gphy_match[] = {
 };
 MODULE_DEVICE_TABLE(of, xway_gphy_match);
 
-static struct xway_gphy_priv *to_xway_gphy_priv(struct notifier_block *nb)
-{
-       return container_of(nb, struct xway_gphy_priv, gphy_reboot_nb);
-}
-
-static int xway_gphy_reboot_notify(struct notifier_block *reboot_nb,
-                                  unsigned long code, void *unused)
-{
-       struct xway_gphy_priv *priv = to_xway_gphy_priv(reboot_nb);
-
-       if (priv) {
-               reset_control_assert(priv->gphy_reset);
-               reset_control_assert(priv->gphy_reset2);
-       }
-
-       return NOTIFY_DONE;
-}
-
 static int xway_gphy_load(struct device *dev, struct xway_gphy_priv *priv,
                          dma_addr_t *dev_addr)
 {
@@ -205,14 +186,6 @@ static int xway_gphy_probe(struct platform_device *pdev)
        reset_control_deassert(priv->gphy_reset);
        reset_control_deassert(priv->gphy_reset2);
 
-       /* assert the gphy reset because it can hang after a reboot: */
-       priv->gphy_reboot_nb.notifier_call = xway_gphy_reboot_notify;
-       priv->gphy_reboot_nb.priority = -1;
-
-       ret = register_reboot_notifier(&priv->gphy_reboot_nb);
-       if (ret)
-               dev_warn(dev, "Failed to register reboot notifier\n");
-
        platform_set_drvdata(pdev, priv);
 
        return ret;
@@ -220,21 +193,12 @@ static int xway_gphy_probe(struct platform_device *pdev)
 
 static int xway_gphy_remove(struct platform_device *pdev)
 {
-       struct device *dev = &pdev->dev;
        struct xway_gphy_priv *priv = platform_get_drvdata(pdev);
-       int ret;
-
-       reset_control_assert(priv->gphy_reset);
-       reset_control_assert(priv->gphy_reset2);
 
        iowrite32be(0, priv->membase);
 
        clk_disable_unprepare(priv->gphy_clk_gate);
 
-       ret = unregister_reboot_notifier(&priv->gphy_reboot_nb);
-       if (ret)
-               dev_warn(dev, "Failed to unregister reboot notifier\n");
-
        return 0;
 }