From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 26 Jul 2023 15:39:35 +0200 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1qOejo-00AuNZ-IT for lore@lore.pengutronix.de; Wed, 26 Jul 2023 15:39:35 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qOejl-00051l-VR for lore@pengutronix.de; Wed, 26 Jul 2023 15:39:34 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:From:In-Reply-To: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; 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Wed, 26 Jul 2023 15:38:24 +0200 Received: from sha by ptx.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1qOeie-0000ze-L2; Wed, 26 Jul 2023 15:38:24 +0200 Date: Wed, 26 Jul 2023 15:38:24 +0200 To: Ahmad Fatoum Cc: barebox@lists.infradead.org Message-ID: <20230726133824.GW18491@pengutronix.de> References: <20230706161640.843682-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230706161640.843682-1-a.fatoum@pengutronix.de> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-Accept-Language: de,en X-Accept-Content-Type: text/plain User-Agent: Mutt/1.10.1 (2018-07-13) From: Sascha Hauer X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230726_063826_790366_05129F94 X-CRM114-Status: GOOD ( 23.29 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.8 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH] ddr: imx8m: add comment and print out prior to first DDRC read X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) On Thu, Jul 06, 2023 at 06:16:40PM +0200, Ahmad Fatoum wrote: > If board code low level entry forgets to call imx8m*_early_clock_init > before DRAM setup, write access to DRAM controller will seem to work, > but the first read access will hang the system. > > Make debugging this board bring up mistake easier by adding a debug > print along with a comment. > > Signed-off-by: Ahmad Fatoum > --- > drivers/ddr/imx8m/ddr_init.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) Applied, thanks Sascha > > diff --git a/drivers/ddr/imx8m/ddr_init.c b/drivers/ddr/imx8m/ddr_init.c > index 944cc3873e0c..9a86280d9c73 100644 > --- a/drivers/ddr/imx8m/ddr_init.c > +++ b/drivers/ddr/imx8m/ddr_init.c > @@ -106,7 +106,11 @@ int imx8m_ddr_init(struct dram_timing_info *dram_timing, > reg32_write(DDRC_RFSHCTL3(0), 0x0000001); > reg32_write(DDRC_PWRCTL(0), 0xa0); > > - /* if ddr type is LPDDR4, do it */ > + pr_debug("checking ddr type\n"); > + /* > + * below is first read, so if boot hangs here, imx8m*_early_clock_init() > + * might not have been called > + */ > tmp = reg32_read(DDRC_MSTR(0)); > if (tmp & (0x1 << 5) && ddrc_type != DDRC_TYPE_MN) > reg32_write(DDRC_DDR_SS_GPR0, 0x01); /* LPDDR4 mode */ > -- > 2.39.2 > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |