From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: [PATCH] ARM: OMAP2+: Use srst_udelay for USB on dm814x Date: Tue, 1 Mar 2016 17:55:02 -0800 Message-ID: <1456883702-32377-1-git-send-email-tony@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-omap@vger.kernel.org Cc: Paul Walmsley , Matthijs van Duin , Nicolas Chauvet , Neil Armstrong , Philipp Rosenberger , Delio Brignoli , Brian Hutchinson , linux-arm-kernel@lists.infradead.org List-Id: linux-omap@vger.kernel.org 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 Signed-off-by: Tony Lindgren --- 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