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Thu, 12 Apr 2018 20:24:20 -0400 Received: from muru.com ([72.249.23.125]:36550 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752163AbeDMAYU (ORCPT ); Thu, 12 Apr 2018 20:24:20 -0400 Date: Thu, 12 Apr 2018 17:24:15 -0700 From: Tony Lindgren To: Pavel Machek Cc: Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, Alan Cox , Dan Williams , Jiri Prchal , Jiri Slaby , Marcel Partap , Merlijn Wajer , Michael Nazzareno Trimarchi , Michael Scott , Peter Hurley , Russ Gorby , Sascha Hauer , Sebastian Reichel Subject: Re: [PATCH 1/2] tty: n_gsm: Fix long delays with control frame timeouts in ADM mode Message-ID: <20180413002415.GC5700@atomide.com> References: <20180407171951.122759-1-tony@atomide.com> <20180408090259.GA8185@amd> <20180408165038.GM5700@atomide.com> <20180408190600.GA24342@amd> <20180408235740.GN5700@atomide.com> <20180409105407.GA15315@amd> <20180409134259.GO5700@atomide.com> <20180412212412.GA29243@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180412212412.GA29243@amd> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-serial-owner@vger.kernel.org X-Mailing-List: linux-serial@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: * Pavel Machek [180412 21:25]: > sudo insmod /tmp/n_gsm.ko debug=0xff > > user@devuan:/my/droid4-ngsm$ sudo ./droid4-ngsm > Starting ngsm.. > Testing ngsm.. > Could not open /dev/gsmtty1: Level 2 halted > Trying to start ngsm again: Level 2 halted > Starting ngsm.. > Testing ngsm.. > Could not open /dev/gsmtty1: Level 2 halted > Trying to start ngsm again: Level 2 halted > Starting ngsm.. > ^CCould not set conf: Interrupted system call > Could not start ngsm: Interrupted system call > > [ 3378.381134] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host > [ 3408.460937] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host > [ 3413.633239] Q> 0) R: UIH(F) > [ 3413.639190] C3 > [ 3413.642761] gsm_data_kick: 00000000: 7e 01 ef c3 aa 7e > ~....~ > [ 3413.653564] gsmld_output: 00000000: 7e 01 ef c3 aa 7e OK so no response from the modem. After few of the above packets, you should then also see something coming back: gsm_data_kick: 00000000: 7e 01 ef c3 aa 7e gsmld_output: 00000000: 7e 01 ef c3 aa 7e gsmld_output: 00000000: f9 03 3f 01 1c f9 --> 0) C: SABM(P) gsmld_output: 00000000: f9 03 3f 01 1c f9 --> 0) C: SABM(P) gsmld_receive: 00000000: f9 03 1f 01 36 f9 <-- 0) C: DM(P) gsmld_output: 00000000: f9 03 3f 01 1c f9 --> 0) C: SABM(P) gsmld_receive: 00000000: f9 03 1f 01 36 f9 <-- 0) C: DM(P) DLCI 0 opening in ADM mode. Do you have phy-mapphone-mdm6600 loaded? That is still needed to configure all the boot mode pins for the modem so it is usable.. The UART will then work also without ohci-platform, just the USB PHY is disabled without ohci-platform. I have these in my .config: CONFIG_SERIAL_8250_OMAP=y CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP=y CONFIG_PHY_MAPPHONE_MDM6600=m CONFIG_N_GSM=m And then the two patches from $subject thread. I just tried it with today's mainline kernel and it's still working for me. Maybe you're missing some related patch though if usingv4.16? 984c7706ff18 ("ARM: dts: omap4-droid4: Configure uart1 pins") e5b9fd7bdeb5 ("ARM: dts: omap4-droid4: Configure MDM6600 USB PHY") fdd192037fce ("ARM: dts: omap4-droid4: Fix USB PHY port naming") bca809d8183c ("ARM: omap2plus_defconfig: Enable MDM6600 USB PHY") 077e1cde78c3 ("ARM: omap2plus_defconfig: Enable 8250_OMAP" So maybe you're still using CONFIG_SERIAL_OMAP=y instead of CONFIG_SERIAL_8250_OMAP=y? Regards, Tony