lkml.org 
[lkml]   [2016]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/3] usb: musb: da8xx: Call earlier clk_prepare_enable()
Date
The first attempt to read a register may fail because the clock may not
be enabled, and then the probe of musb driver will fail.
Call clk_prepare_enable() before the first register read.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
---
drivers/usb/musb/da8xx.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index 210b7e4..ec93602 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -366,6 +366,12 @@ static int da8xx_musb_init(struct musb *musb)

musb->mregs += DA8XX_MENTOR_CORE_OFFSET;

+ ret = clk_prepare_enable(glue->clk);
+ if (ret) {
+ dev_err(glue->dev, "failed to enable clock\n");
+ goto fail;
+ }
+
/* Returns zero if e.g. not clocked */
rev = musb_readl(reg_base, DA8XX_USB_REVISION_REG);
if (!rev)
@@ -377,12 +383,6 @@ static int da8xx_musb_init(struct musb *musb)
goto fail;
}

- ret = clk_prepare_enable(glue->clk);
- if (ret) {
- dev_err(glue->dev, "failed to enable clock\n");
- goto fail;
- }
-
setup_timer(&otg_workaround, otg_timer, (unsigned long)musb);

/* Reset the controller */
--
2.7.3
\
 
 \ /
  Last update: 2016-10-25 15:54    [W:0.052 / U:1.376 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site