From patchwork Sat Jun 18 16:27:02 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 9185721 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B62E46075F for ; Sat, 18 Jun 2016 16:30:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A6C5328356 for ; Sat, 18 Jun 2016 16:30:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9AA7428365; Sat, 18 Jun 2016 16:30:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 31C4128356 for ; Sat, 18 Jun 2016 16:30:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751583AbcFRQ2d (ORCPT ); Sat, 18 Jun 2016 12:28:33 -0400 Received: from mail.kernel.org ([198.145.29.136]:50786 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751404AbcFRQ2b (ORCPT ); Sat, 18 Jun 2016 12:28:31 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1910820165; Sat, 18 Jun 2016 16:28:30 +0000 (UTC) Received: from mail.kernel.org (unknown [178.162.198.111]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 567362013D; Sat, 18 Jun 2016 16:28:27 +0000 (UTC) From: Sebastian Reichel To: Sebastian Reichel , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Tony Lindgren , Aaro Koskinen , Pavel Machek , Ivaylo Dimitrov , =?UTF-8?q?Pali=20Roh=C3=A1r?= Subject: [RFC 12/19] HSI: omap_ssi_port: switch to threaded pio irq Date: Sat, 18 Jun 2016 18:27:02 +0200 Message-Id: <1466267229-25012-13-git-send-email-sre@kernel.org> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1466267229-25012-1-git-send-email-sre@kernel.org> References: <1466267229-25012-1-git-send-email-sre@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Move pio interrupt handler from tasklet into thread to allow runtime_pm_get_sync calls without irq_safe being set. Signed-off-by: Sebastian Reichel --- drivers/hsi/controllers/omap_ssi.h | 2 -- drivers/hsi/controllers/omap_ssi_port.c | 60 +++++++++++++-------------------- 2 files changed, 24 insertions(+), 38 deletions(-) diff --git a/drivers/hsi/controllers/omap_ssi.h b/drivers/hsi/controllers/omap_ssi.h index 5467f61e5086..99143f4f8837 100644 --- a/drivers/hsi/controllers/omap_ssi.h +++ b/drivers/hsi/controllers/omap_ssi.h @@ -76,7 +76,6 @@ struct omap_ssm_ctx { * @irq: IRQ number * @wake_irq: IRQ number for incoming wake line (-1 if none) * @wake_gpio: GPIO number for incoming wake line (-1 if none) - * @pio_tasklet: Bottom half for PIO transfers and events * @flags: flags to keep track of states * @wk_refcount: Reference count for output wake line * @work: worker for starting TX @@ -100,7 +99,6 @@ struct omap_ssi_port { unsigned int irq; int wake_irq; struct gpio_desc *wake_gpio; - struct tasklet_struct pio_tasklet; bool wktest:1; /* FIXME: HACK to be removed */ unsigned long flags; unsigned int wk_refcount; diff --git a/drivers/hsi/controllers/omap_ssi_port.c b/drivers/hsi/controllers/omap_ssi_port.c index cc56d0ee82a2..f62f0c482cea 100644 --- a/drivers/hsi/controllers/omap_ssi_port.c +++ b/drivers/hsi/controllers/omap_ssi_port.c @@ -877,7 +877,7 @@ static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue) u32 reg; u32 val; - spin_lock(&omap_port->lock); + spin_lock_bh(&omap_port->lock); msg = list_first_entry(queue, struct hsi_msg, link); if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) { msg->actual_len = 0; @@ -909,7 +909,7 @@ static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue) (msg->ttype == HSI_MSG_WRITE))) { writel(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); - spin_unlock(&omap_port->lock); + spin_unlock_bh(&omap_port->lock); return; } @@ -925,12 +925,12 @@ static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue) writel_relaxed(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel_relaxed(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); list_del(&msg->link); - spin_unlock(&omap_port->lock); + spin_unlock_bh(&omap_port->lock); msg->complete(msg); ssi_transfer(omap_port, queue); } -static void ssi_pio_tasklet(unsigned long ssi_port) +static irqreturn_t ssi_pio_thread(int irq, void *ssi_port) { struct hsi_port *port = (struct hsi_port *)ssi_port; struct hsi_controller *ssi = to_hsi_controller(port->device.parent); @@ -941,37 +941,29 @@ static void ssi_pio_tasklet(unsigned long ssi_port) u32 status_reg; pm_runtime_get_sync(omap_port->pdev); - status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); - status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); - for (ch = 0; ch < omap_port->channels; ch++) { - if (status_reg & SSI_DATAACCEPT(ch)) - ssi_pio_complete(port, &omap_port->txqueue[ch]); - if (status_reg & SSI_DATAAVAILABLE(ch)) - ssi_pio_complete(port, &omap_port->rxqueue[ch]); - } - if (status_reg & SSI_BREAKDETECTED) - ssi_break_complete(port); - if (status_reg & SSI_ERROROCCURED) - ssi_error(port); + do { + status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); + status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); - status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); - status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); - pm_runtime_put_sync(omap_port->pdev); + for (ch = 0; ch < omap_port->channels; ch++) { + if (status_reg & SSI_DATAACCEPT(ch)) + ssi_pio_complete(port, &omap_port->txqueue[ch]); + if (status_reg & SSI_DATAAVAILABLE(ch)) + ssi_pio_complete(port, &omap_port->rxqueue[ch]); + } + if (status_reg & SSI_BREAKDETECTED) + ssi_break_complete(port); + if (status_reg & SSI_ERROROCCURED) + ssi_error(port); - if (status_reg) - tasklet_hi_schedule(&omap_port->pio_tasklet); - else - enable_irq(omap_port->irq); -} + status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); + status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); -static irqreturn_t ssi_pio_isr(int irq, void *port) -{ - struct omap_ssi_port *omap_port = hsi_port_drvdata(port); - - tasklet_hi_schedule(&omap_port->pio_tasklet); - disable_irq_nosync(irq); + /* TODO: sleep if we retry? */ + } while (status_reg); + pm_runtime_put(omap_port->pdev); return IRQ_HANDLED; } @@ -1023,10 +1015,8 @@ static int ssi_port_irq(struct hsi_port *port, struct platform_device *pd) return err; } omap_port->irq = err; - tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet, - (unsigned long)port); - err = devm_request_irq(&port->device, omap_port->irq, ssi_pio_isr, - 0, "mpu_irq0", port); + err = devm_request_threaded_irq(&port->device, omap_port->irq, NULL, + ssi_pio_thread, IRQF_ONESHOT, "SSI PORT", port); if (err < 0) dev_err(&port->device, "Request IRQ %d failed (%d)\n", omap_port->irq, err); @@ -1229,8 +1219,6 @@ static int ssi_port_remove(struct platform_device *pd) hsi_port_unregister_clients(port); - tasklet_kill(&omap_port->pio_tasklet); - port->async = hsi_dummy_msg; port->setup = hsi_dummy_cl; port->flush = hsi_dummy_cl;