Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752623AbdI0IgV (ORCPT ); Wed, 27 Sep 2017 04:36:21 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:46771 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752487AbdI0IgO (ORCPT ); Wed, 27 Sep 2017 04:36:14 -0400 X-Google-Smtp-Source: AOwi7QC8de/LX7DtKfMfi8SNQ+mtUl0r03rkwEBNWagZeggs51mwGBQraPxvcv6K0Io8et8nDUveUQ== From: Romain Izard To: Boris Brezillon , Michael Turquette , Stephen Boyd , Lee Jones , Wenyou Yang , Josh Wu , Richard Weinberger , David Woodhouse , Brian Norris , Marek Vasut , Cyrille Pitchen , Thierry Reding , Richard Genoud , Greg Kroah-Hartman , Jiri Slaby , Alan Stern , Ludovic Desroches , Nicolas Ferre , Alexandre Belloni Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-pwm@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, Romain Izard Subject: [PATCH v3 1/8] clk: at91: pmc: Wait for clocks when resuming Date: Wed, 27 Sep 2017 10:35:48 +0200 Message-Id: <20170927083555.16580-2-romain.izard.pro@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170927083555.16580-1-romain.izard.pro@gmail.com> References: <20170927083555.16580-1-romain.izard.pro@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1557 Lines: 58 Wait for the syncronization of all clocks when resuming, not only the UPLL clock. Do not use regmap_read_poll_timeout, as it will call BUG() when interrupts are masked, which is the case in here. Signed-off-by: Romain Izard Acked-by: Ludovic Desroches Acked-by: Nicolas Ferre --- drivers/clk/at91/pmc.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index 775af473fe11..5c2b26de303e 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -107,10 +107,20 @@ static int pmc_suspend(void) return 0; } +static bool pmc_ready(unsigned int mask) +{ + unsigned int status; + + regmap_read(pmcreg, AT91_PMC_SR, &status); + + return ((status & mask) == mask) ? 1 : 0; +} + static void pmc_resume(void) { - int i, ret = 0; + int i; u32 tmp; + u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA; regmap_read(pmcreg, AT91_PMC_MCKR, &tmp); if (pmc_cache.mckr != tmp) @@ -134,13 +144,11 @@ static void pmc_resume(void) AT91_PMC_PCR_CMD); } - if (pmc_cache.uckr & AT91_PMC_UPLLEN) { - ret = regmap_read_poll_timeout(pmcreg, AT91_PMC_SR, tmp, - !(tmp & AT91_PMC_LOCKU), - 10, 5000); - if (ret) - pr_crit("USB PLL didn't lock when resuming\n"); - } + if (pmc_cache.uckr & AT91_PMC_UPLLEN) + mask |= AT91_PMC_LOCKU; + + while (!pmc_ready(mask)) + cpu_relax(); } static struct syscore_ops pmc_syscore_ops = { -- 2.11.0