redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

Revert "usb: dwc3: meson-g12a: fix shared reset control use" 

This reverts commit 7a410953d1.

This commit breaks USB on meson-gxl-s905x-libretech-cc. Reverting
the change solves the issue.

In fact, according to the reset framework code, consumers must not use
reset_control_(de)assert() on shared reset lines when reset_control_reset
has been used, and vice-versa.

Moreover, with this commit, usb is not guaranted to be reset since the
reset is likely to be initially deasserted.

Reverting the commit will bring back the suspend warning mentioned in the
commit description. Nevertheless, a warning is much less critical than
breaking dwc3-meson-g12a USB completely. We will address the warning
issue in another way as a 2nd step.

Fixes: 7a410953d1 ("usb: dwc3: meson-g12a: fix shared reset control use")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
Reported-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20200827144810.26657-1-aouledameur@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-sugar-mainline-defconfig
Amjad Ouled-Ameur 2020-08-27 16:48:10 +02:00 committed by Greg Kroah-Hartman
parent 1f3546ff3f
commit a6498d5182
1 changed files with 6 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/usb/dwc3/dwc3-meson-g12a.c
View File

@ -737,13 +737,13 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
goto err_disable_clks;
}
ret = reset_control_deassert(priv->reset);
ret = reset_control_reset(priv->reset);
if (ret)
goto err_assert_reset;
goto err_disable_clks;
ret = dwc3_meson_g12a_get_phys(priv);
if (ret)
goto err_assert_reset;
goto err_disable_clks;
ret = priv->drvdata->setup_regmaps(priv, base);
if (ret)
@ -752,7 +752,7 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
if (priv->vbus) {
ret = regulator_enable(priv->vbus);
if (ret)
goto err_assert_reset;
goto err_disable_clks;
}
/* Get dr_mode */
@ -765,13 +765,13 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
ret = priv->drvdata->usb_init(priv);
if (ret)
goto err_assert_reset;
goto err_disable_clks;
/* Init PHYs */
for (i = 0 ; i < PHY_COUNT ; ++i) {
ret = phy_init(priv->phys[i]);
if (ret)
goto err_assert_reset;
goto err_disable_clks;
}
/* Set PHY Power */
@ -809,9 +809,6 @@ err_phys_exit:
for (i = 0 ; i < PHY_COUNT ; ++i)
phy_exit(priv->phys[i]);
err_assert_reset:
reset_control_assert(priv->reset);
err_disable_clks:
clk_bulk_disable_unprepare(priv->drvdata->num_clks,
priv->drvdata->clks);