From patchwork Fri Aug 30 23:20:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11124689 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D87CA1399 for ; Fri, 30 Aug 2019 23:21:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C1DDC2343D for ; Fri, 30 Aug 2019 23:21:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728324AbfH3XVF (ORCPT ); Fri, 30 Aug 2019 19:21:05 -0400 Received: from muru.com ([72.249.23.125]:59248 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbfH3XVE (ORCPT ); Fri, 30 Aug 2019 19:21:04 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 78C278116; Fri, 30 Aug 2019 23:21:33 +0000 (UTC) From: Tony Lindgren To: Bin Liu Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-omap@vger.kernel.org, Jacopo Mondi , Marcel Partap , Merlijn Wajer , Michael Scott , NeKit , Pavel Machek , Sebastian Reichel Subject: [PATCH 1/4] usb: musb: omap2430: Wait on enable to avoid babble Date: Fri, 30 Aug 2019 16:20:55 -0700 Message-Id: <20190830232058.53414-2-tony@atomide.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190830232058.53414-1-tony@atomide.com> References: <20190830232058.53414-1-tony@atomide.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org We can babble interrupt if we attempt to switch to USB host mode too soon after enabling musb. Let's fix the issue by waiting a bit in runtime_resume. Cc: Jacopo Mondi Cc: Marcel Partap Cc: Merlijn Wajer Cc: Michael Scott Cc: NeKit Cc: Pavel Machek Cc: Sebastian Reichel Signed-off-by: Tony Lindgren --- drivers/usb/musb/omap2430.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -552,6 +552,9 @@ static int omap2430_runtime_resume(struct device *dev) musb_writel(musb->mregs, OTG_INTERFSEL, musb->context.otg_interfsel); + /* Wait for musb to get oriented. Otherwise we can get babble */ + usleep_range(200000, 250000); + return 0; } From patchwork Fri Aug 30 23:20:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11124693 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 58B80174A for ; Fri, 30 Aug 2019 23:21:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3883623431 for ; Fri, 30 Aug 2019 23:21:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728334AbfH3XVH (ORCPT ); Fri, 30 Aug 2019 19:21:07 -0400 Received: from muru.com ([72.249.23.125]:59260 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbfH3XVH (ORCPT ); Fri, 30 Aug 2019 19:21:07 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 26E68817C; Fri, 30 Aug 2019 23:21:35 +0000 (UTC) From: Tony Lindgren To: Bin Liu Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-omap@vger.kernel.org, Jacopo Mondi , Marcel Partap , Merlijn Wajer , Michael Scott , NeKit , Pavel Machek , Sebastian Reichel Subject: [PATCH 2/4] usb: musb: omap2430: Handle multiple ID ground interrupts Date: Fri, 30 Aug 2019 16:20:56 -0700 Message-Id: <20190830232058.53414-3-tony@atomide.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190830232058.53414-1-tony@atomide.com> References: <20190830232058.53414-1-tony@atomide.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org We currently get "unhandled DISCONNECT transition" warnings from musb core on device disconnect as things are wrongly set to OTG_STATE_A_IDLE in host mode when enumerating devices. We can also get "Failed to write reg index" errors after enumerating. This is happening at least with cpcap phy where we get multiple ID ground interrupts. Looks like it's VBUS keeps timing out and needs to be kicked when the phy sends multiple ID ground interrupts during host mode. Cc: Jacopo Mondi Cc: Marcel Partap Cc: Merlijn Wajer Cc: Michael Scott Cc: NeKit Cc: Pavel Machek Cc: Sebastian Reichel Signed-off-by: Tony Lindgren --- drivers/usb/musb/omap2430.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -151,13 +151,26 @@ static void omap_musb_set_mailbox(struct omap2430_glue *glue) switch (glue->status) { case MUSB_ID_GROUND: dev_dbg(musb->controller, "ID GND\n"); - - musb->xceiv->otg->state = OTG_STATE_A_IDLE; - musb->xceiv->last_event = USB_EVENT_ID; - if (musb->gadget_driver) { - omap_control_usb_set_mode(glue->control_otghs, - USB_MODE_HOST); + switch (musb->xceiv->otg->state) { + case OTG_STATE_A_WAIT_VRISE: + case OTG_STATE_A_WAIT_BCON: + case OTG_STATE_A_HOST: + case OTG_STATE_A_IDLE: + /* + * On multiple ID ground interrupts just keep enabling + * VBUS. At least cpcap VBUS shuts down otherwise. + */ omap2430_musb_set_vbus(musb, 1); + break; + default: + musb->xceiv->otg->state = OTG_STATE_A_IDLE; + musb->xceiv->last_event = USB_EVENT_ID; + if (musb->gadget_driver) { + omap_control_usb_set_mode(glue->control_otghs, + USB_MODE_HOST); + omap2430_musb_set_vbus(musb, 1); + } + break; } break; From patchwork Fri Aug 30 23:20:57 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11124697 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DF524174A for ; Fri, 30 Aug 2019 23:21:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BFB7723711 for ; Fri, 30 Aug 2019 23:21:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728353AbfH3XVJ (ORCPT ); Fri, 30 Aug 2019 19:21:09 -0400 Received: from muru.com ([72.249.23.125]:59282 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbfH3XVJ (ORCPT ); Fri, 30 Aug 2019 19:21:09 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 02CD081A1; Fri, 30 Aug 2019 23:21:36 +0000 (UTC) From: Tony Lindgren To: Bin Liu Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-omap@vger.kernel.org, Jacopo Mondi , Marcel Partap , Merlijn Wajer , Michael Scott , NeKit , Pavel Machek , Sebastian Reichel Subject: [PATCH 3/4] usb: musb: Add musb_set_host and peripheral and use them for omap2430 Date: Fri, 30 Aug 2019 16:20:57 -0700 Message-Id: <20190830232058.53414-4-tony@atomide.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190830232058.53414-1-tony@atomide.com> References: <20190830232058.53414-1-tony@atomide.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org At least some revisions of musb core need to set devctl session bit in peripheral mode to force musb to host mode. And we have places clearing the devctl session bit. Let's add a generic function to do this, and use it for omap2430. This should get us a bit closer to completely removing devctl register tinkering in the SoC glue code. Before making use of this code for the other glue layers, things need to be tested carefully as there may be a approximately a 200 ms delay needed between powering up musb and calling musb_set_host() to avoid. Otherwise the system hangs at least with omap2430 glue layer. Signed-off-by: Tony Lindgren --- drivers/usb/musb/musb_core.c | 103 +++++++++++++++++++++++++++++++++++ drivers/usb/musb/musb_core.h | 3 + drivers/usb/musb/omap2430.c | 70 +++++++----------------- 3 files changed, 127 insertions(+), 49 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -73,6 +73,7 @@ #include #include #include +#include #include #include #include @@ -414,6 +415,108 @@ void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) return hw_ep->musb->io.write_fifo(hw_ep, len, src); } +static u8 musb_read_devctl(struct musb *musb) +{ + return musb_readb(musb->mregs, MUSB_DEVCTL); +} + +/** + * musb_set_host - set and initialize host mode + * @musb: musb controller driver data + * + * At least some musb revisions need to enable devctl session bit in + * peripheral mode to switch to host mode. Initializes things to host + * mode and sets A_IDLE. SoC glue needs to advance state further + * based on phy provided VBUS state. + * + * Note that the SoC glue code may need to wait for musb to settle + * on enable before calling this to avoid babble. + */ +int musb_set_host(struct musb *musb) +{ + int error = 0; + u8 devctl; + + if (!musb) + return -EINVAL; + + devctl = musb_read_devctl(musb); + if (!(devctl & MUSB_DEVCTL_BDEVICE)) { + dev_info(musb->controller, + "%s: already in host mode: %02x\n", + __func__, devctl); + goto init_data; + } + + devctl |= MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + error = readx_poll_timeout(musb_read_devctl, musb, devctl, + !(devctl & MUSB_DEVCTL_BDEVICE), 5000, + 1000000); + if (error) { + dev_err(musb->controller, "%s: could not set host: %02x\n", + __func__, devctl); + + return error; + } + +init_data: + musb->is_active = 1; + musb->xceiv->otg->state = OTG_STATE_A_IDLE; + MUSB_HST_MODE(musb); + + return error; +} +EXPORT_SYMBOL_GPL(musb_set_host); + +/** + * musb_set_peripheral - set and initialize peripheral mode + * @musb: musb controller driver data + * + * Clears devctl session bit and initializes things for peripheral + * mode and sets B_IDLE. SoC glue needs to advance state further + * based on phy provided VBUS state. + */ +int musb_set_peripheral(struct musb *musb) +{ + int error = 0; + u8 devctl; + + if (!musb) + return -EINVAL; + + devctl = musb_read_devctl(musb); + if (devctl & MUSB_DEVCTL_BDEVICE) { + dev_info(musb->controller, + "%s: already in peripheral mode: %02x\n", + __func__, devctl); + + goto init_data; + } + + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + error = readx_poll_timeout(musb_read_devctl, musb, devctl, + devctl & MUSB_DEVCTL_BDEVICE, 5000, + 1000000); + if (error) { + dev_err(musb->controller, "%s: could not set periperal: %02x\n", + __func__, devctl); + + return error; + } + +init_data: + musb->is_active = 0; + musb->xceiv->otg->state = OTG_STATE_B_IDLE; + MUSB_DEV_MODE(musb); + + return error; +} +EXPORT_SYMBOL_GPL(musb_set_peripheral); + /*-------------------------------------------------------------------------*/ /* for high speed test mode; see USB 2.0 spec 7.1.20 */ diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h --- a/drivers/usb/musb/musb_core.h +++ b/drivers/usb/musb/musb_core.h @@ -487,6 +487,9 @@ extern void musb_start(struct musb *musb); extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src); extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst); +extern int musb_set_host(struct musb *musb); +extern int musb_set_peripheral(struct musb *musb); + extern void musb_load_testpacket(struct musb *); extern irqreturn_t musb_interrupt(struct musb *); diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -38,65 +38,37 @@ struct omap2430_glue { static struct omap2430_glue *_glue; +/* + * HDRC controls CPEN, but beware current surges during device connect. + * They can trigger transient overcurrent conditions that must be ignored. + * + * Note that we're skipping A_WAIT_VFALL -> A_IDLE and jumping right to B_IDLE + * as set by musb_set_peripheral(). + */ static void omap2430_musb_set_vbus(struct musb *musb, int is_on) { - struct usb_otg *otg = musb->xceiv->otg; - u8 devctl; - unsigned long timeout = jiffies + msecs_to_jiffies(1000); - /* HDRC controls CPEN, but beware current surges during device - * connect. They can trigger transient overcurrent conditions - * that must be ignored. - */ - - devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + struct usb_otg *otg = musb->xceiv->otg; + int error; if (is_on) { - if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) { - int loops = 100; - /* start the session */ - devctl |= MUSB_DEVCTL_SESSION; - musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); - /* - * Wait for the musb to set as A device to enable the - * VBUS - */ - while (musb_readb(musb->mregs, MUSB_DEVCTL) & - MUSB_DEVCTL_BDEVICE) { - - mdelay(5); - cpu_relax(); - - if (time_after(jiffies, timeout) - || loops-- <= 0) { - dev_err(musb->controller, - "configured as A device timeout"); - break; - } + switch (musb->xceiv->otg->state) { + case OTG_STATE_A_IDLE: + error = musb_set_host(musb); + if (!error) { + musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; + otg_set_vbus(otg, 1); } - + break; + default: otg_set_vbus(otg, 1); - } else { - musb->is_active = 1; - musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; - devctl |= MUSB_DEVCTL_SESSION; - MUSB_HST_MODE(musb); + break; } } else { - musb->is_active = 0; - - /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and - * jumping right to B_IDLE... - */ - - musb->xceiv->otg->state = OTG_STATE_B_IDLE; - devctl &= ~MUSB_DEVCTL_SESSION; - - MUSB_DEV_MODE(musb); + error = musb_set_peripheral(musb); + otg_set_vbus(otg, 0); } - musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); - dev_dbg(musb->controller, "VBUS %s, devctl %02x " - /* otg %3x conf %08x prcm %08x */ "\n", + dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", usb_otg_state_string(musb->xceiv->otg->state), musb_readb(musb->mregs, MUSB_DEVCTL)); } From patchwork Fri Aug 30 23:20:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11124701 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5BD5513B1 for ; Fri, 30 Aug 2019 23:21:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3B9542343B for ; Fri, 30 Aug 2019 23:21:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728376AbfH3XVL (ORCPT ); Fri, 30 Aug 2019 19:21:11 -0400 Received: from muru.com ([72.249.23.125]:59296 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbfH3XVL (ORCPT ); Fri, 30 Aug 2019 19:21:11 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id B8CF780D4; Fri, 30 Aug 2019 23:21:39 +0000 (UTC) From: Tony Lindgren To: Bin Liu Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-omap@vger.kernel.org, Jacopo Mondi , Marcel Partap , Merlijn Wajer , Michael Scott , NeKit , Pavel Machek , Sebastian Reichel Subject: [PATCH 4/4] usb: musb: omap2430: Clean up enable and remove devctl tinkering Date: Fri, 30 Aug 2019 16:20:58 -0700 Message-Id: <20190830232058.53414-5-tony@atomide.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190830232058.53414-1-tony@atomide.com> References: <20190830232058.53414-1-tony@atomide.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org There should be no need to tinker with devctl in enable in the SoC glue code. We have musb_start() to take care of handling it already. Signed-off-by: Tony Lindgren --- drivers/usb/musb/omap2430.c | 20 -------------------- 1 file changed, 20 deletions(-) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -275,33 +275,13 @@ static int omap2430_musb_init(struct musb *musb) static void omap2430_musb_enable(struct musb *musb) { - u8 devctl; - unsigned long timeout = jiffies + msecs_to_jiffies(1000); struct device *dev = musb->controller; struct omap2430_glue *glue = dev_get_drvdata(dev->parent); - struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev); - struct omap_musb_board_data *data = pdata->board_data; - switch (glue->status) { case MUSB_ID_GROUND: omap_control_usb_set_mode(glue->control_otghs, USB_MODE_HOST); - if (data->interface_type != MUSB_INTERFACE_UTMI) - break; - devctl = musb_readb(musb->mregs, MUSB_DEVCTL); - /* start the session */ - devctl |= MUSB_DEVCTL_SESSION; - musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); - while (musb_readb(musb->mregs, MUSB_DEVCTL) & - MUSB_DEVCTL_BDEVICE) { - cpu_relax(); - - if (time_after(jiffies, timeout)) { - dev_err(dev, "configured as A device timeout"); - break; - } - } break; case MUSB_VBUS_VALID: