* [PATCH] ARM: OMAP2+: Use srst_udelay for USB on dm814x
@ 2016-03-02 1:55 Tony Lindgren
2016-03-02 3:30 ` Paul Walmsley
0 siblings, 1 reply; 2+ messages in thread
From: Tony Lindgren @ 2016-03-02 1:55 UTC (permalink / raw)
To: linux-arm-kernel
Without this booting t410 can fail randomly with no output
depending on the .config options chosen. Enabling debug_ll
causes the problem to go away. I narrowed this down to USB
by disabling one module at a time.
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
arch/arm/mach-omap2/omap_hwmod_81xx_data.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/mach-omap2/omap_hwmod_81xx_data.c b/arch/arm/mach-omap2/omap_hwmod_81xx_data.c
index 39736ad..df83277 100644
--- a/arch/arm/mach-omap2/omap_hwmod_81xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_81xx_data.c
@@ -582,9 +582,11 @@ static struct omap_hwmod_ocp_if dm81xx_alwon_l3_slow__gpmc = {
.user = OCP_USER_MPU,
};
+/* USB needs udelay 1 after reset at least on hp t410, use 2 for margin */
static struct omap_hwmod_class_sysconfig dm81xx_usbhsotg_sysc = {
.rev_offs = 0x0,
.sysc_offs = 0x10,
+ .srst_udelay = 2,
.sysc_flags = SYSC_HAS_SIDLEMODE | SYSC_HAS_MIDLEMODE |
SYSC_HAS_SOFTRESET,
.idlemodes = SIDLE_SMART | MSTANDBY_FORCE | MSTANDBY_SMART,
--
2.7.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] ARM: OMAP2+: Use srst_udelay for USB on dm814x
2016-03-02 1:55 [PATCH] ARM: OMAP2+: Use srst_udelay for USB on dm814x Tony Lindgren
@ 2016-03-02 3:30 ` Paul Walmsley
0 siblings, 0 replies; 2+ messages in thread
From: Paul Walmsley @ 2016-03-02 3:30 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, 1 Mar 2016, Tony Lindgren wrote:
> Without this booting t410 can fail randomly with no output
> depending on the .config options chosen. Enabling debug_ll
> causes the problem to go away. I narrowed this down to USB
> by disabling one module at a time.
>
> Cc: Paul Walmsley <paul@pwsan.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>
Wow, nice. Bet that was a pain!
Acked-by: Paul Walmsley <paul@pwsan.com>
- Paul
^ permalink raw reply [flat|nested] 2+ messages in thread
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