From patchwork Wed Aug 17 01:47:45 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Walmsley X-Patchwork-Id: 1072762 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by demeter1.kernel.org (8.14.4/8.14.4) with ESMTP id p7H1m1HX003267 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 17 Aug 2011 01:48:22 GMT Received: from canuck.infradead.org ([2001:4978:20e::1]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QtVEV-0004Wx-Sm; Wed, 17 Aug 2011 01:47:52 +0000 Received: from localhost ([127.0.0.1] helo=canuck.infradead.org) by canuck.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1QtVEV-0002ny-DK; Wed, 17 Aug 2011 01:47:51 +0000 Received: from utopia.booyaka.com ([72.9.107.138]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QtVER-0002nf-6p for linux-arm-kernel@lists.infradead.org; Wed, 17 Aug 2011 01:47:48 +0000 Received: (qmail 23318 invoked by uid 1019); 17 Aug 2011 01:47:45 -0000 Date: Tue, 16 Aug 2011 19:47:45 -0600 (MDT) From: Paul Walmsley To: Santosh Subject: Re: [PATCH] OMAP: clockdomain: Wait for powerdomain to be ON when using clockdomain force wakeup In-Reply-To: Message-ID: References: <1310527588-13022-1-git-send-email-santosh.shilimkar@ti.com> <1310527588-13022-2-git-send-email-santosh.shilimkar@ti.com> <4E214267.2090700@ti.com> <4E43E23C.2080207@ti.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 X-CRM114-Version: 20090807-BlameThorstenAndJenny ( TRE 0.7.6 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20110816_214747_350825_04A6D326 X-CRM114-Status: GOOD ( 15.68 ) X-Spam-Score: -1.1 (-) X-Spam-Report: SpamAssassin version 3.3.1 on canuck.infradead.org summary: Content analysis details: (-1.1 points) pts rule name description ---- ---------------------- -------------------------------------------------- -1.1 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain Cc: khilman@ti.com, b-cousson@ti.com, Rajendra Nayak , p-titiano@ti.com, Tero Kristo , linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Wed, 17 Aug 2011 01:48:23 +0000 (UTC) Hi everyone I've updated this patch per my earlier comments and also to apply. Please let me know if you have any issues with it ASAP. - Paul From: Santosh Shilimkar Date: Sat, 13 Aug 2011 08:56:28 +0530 Subject: [PATCH] [PATCH] OMAP: clockdomain: Wait for powerdomain to be ON when using clockdomain force wakeup While using clockdomain force wakeup method, not waiting for powerdomain to be effectively ON may end up locking the clockdomain FSM until a next wakeup event occurs. One such issue was seen on OMAP4430, where L4_PER was periodically getting stuck in in-transition state when transitioning from from OSWR to ON. This issue was reported and investigated by Patrick Titiano Signed-off-by: Santosh Shilimkar Signed-off-by: Rajendra Nayak Reported-by: Patrick Titiano Cc: Kevin Hilman Cc: Benoit Cousson Cc: Paul Walmsley [paul@pwsan.com: updated to apply; added transition wait on clkdm_deny_idle(); remove two superfluous pwrdm_wait_transition() calls] Signed-off-by: Paul Walmsley --- arch/arm/mach-omap2/clockdomain.c | 2 ++ arch/arm/mach-omap2/pm.c | 2 -- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c index ab7db08..8f08906 100644 --- a/arch/arm/mach-omap2/clockdomain.c +++ b/arch/arm/mach-omap2/clockdomain.c @@ -747,6 +747,7 @@ int clkdm_wakeup(struct clockdomain *clkdm) spin_lock_irqsave(&clkdm->lock, flags); clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; ret = arch_clkdm->clkdm_wakeup(clkdm); + ret |= pwrdm_state_switch(clkdm->pwrdm.ptr); spin_unlock_irqrestore(&clkdm->lock, flags); return ret; } @@ -818,6 +819,7 @@ void clkdm_deny_idle(struct clockdomain *clkdm) spin_lock_irqsave(&clkdm->lock, flags); clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; arch_clkdm->clkdm_deny_idle(clkdm); + pwrdm_state_switch(clkdm->pwrdm.ptr); spin_unlock_irqrestore(&clkdm->lock, flags); } diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c index 3feb359..472bf22 100644 --- a/arch/arm/mach-omap2/pm.c +++ b/arch/arm/mach-omap2/pm.c @@ -130,7 +130,6 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) } else { hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]); clkdm_wakeup(pwrdm->pwrdm_clkdms[0]); - pwrdm_wait_transition(pwrdm); sleep_switch = FORCEWAKEUP_SWITCH; } } @@ -156,7 +155,6 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) return ret; } - pwrdm_wait_transition(pwrdm); pwrdm_state_switch(pwrdm); err: return ret;