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Message-ID: <20200717063856.GH82923@vkoul-mobl>
Date: Fri, 17 Jul 2020 12:08:56 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: kishon@...com, wsa+renesas@...g-engineering.com,
geert+renesas@...der.be, linux-renesas-soc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] phy: renesas: rcar-gen3-usb2: fix SError happen if
DEBUG_SHIRQ is enabled
hello Yoshihiro,
On 13-07-20, 21:11, Yoshihiro Shimoda wrote:
Please consider revising patch subject. It tell me you are fixing an
error but it doesnt tell me what this patch is about :)
Perhpas :move irq registration to init" maybe a better title which
describes the changes this patch brings in
> If CONFIG_DEBUG_SHIRQ was enabled, r8a77951-salvator-xs could boot
> correctly. If we appended "earlycon keep_bootcon" to the kernel
> command like, we could get kernel log like below.
>
> SError Interrupt on CPU0, code 0xbf000002 -- SError
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc3-salvator-x-00505-g6c843129e6faaf01 #785
> Hardware name: Renesas Salvator-X 2nd version board based on r8a77951 (DT)
> pstate: 60400085 (nZCv daIf +PAN -UAO BTYPE=--)
> pc : rcar_gen3_phy_usb2_irq+0x14/0x54
> lr : free_irq+0xf4/0x27c
>
> This means free_irq() calls the interrupt handler while PM runtime
> is not getting if DEBUG_SHIRQ is enabled and rcar_gen3_phy_usb2_probe()
> failed. To fix the issue, move the irq registration place to
> rcar_gen3_phy_usb2_init() which is ready to handle the interrupts.
>
> Note that after the commit 549b6b55b005 ("phy: renesas: rcar-gen3-usb2:
> enable/disable independent irqs") which is merged into v5.2, since this
> driver creates multiple phy instances, needs to check whether one of
> phy instances is initialized. However, if we backport this patch to v5.1
> or less, we don't need to check it because such kernel have single
> phy instance.
>
> Reported-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Fixes: 9f391c574efc ("phy: rcar-gen3-usb2: add runtime ID/VBUS pin detection")
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
> Changes from v1:
> - Move the irq registration to rcar_gen3_phy_usb2_init() instead of
> add a condition into the irq handler.
> https://patchwork.kernel.org/patch/11654097/
>
> drivers/phy/renesas/phy-rcar-gen3-usb2.c | 62 +++++++++++++++++---------------
> 1 file changed, 34 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> index bfb22f8..6978f86 100644
> --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> @@ -111,6 +111,7 @@ struct rcar_gen3_chan {
> struct work_struct work;
> struct mutex lock; /* protects rphys[...].powered */
> enum usb_dr_mode dr_mode;
> + int irq;
> bool extcon_host;
> bool is_otg_channel;
> bool uses_otg_pins;
> @@ -389,12 +390,39 @@ static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
> rcar_gen3_device_recognition(ch);
> }
>
> +static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
> +{
> + struct rcar_gen3_chan *ch = _ch;
> + void __iomem *usb2_base = ch->base;
> + u32 status = readl(usb2_base + USB2_OBINTSTA);
> + irqreturn_t ret = IRQ_NONE;
> +
> + if (status & USB2_OBINT_BITS) {
> + dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
> + writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
> + rcar_gen3_device_recognition(ch);
> + ret = IRQ_HANDLED;
> + }
> +
> + return ret;
> +}
> +
> static int rcar_gen3_phy_usb2_init(struct phy *p)
> {
> struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
> struct rcar_gen3_chan *channel = rphy->ch;
> void __iomem *usb2_base = channel->base;
> u32 val;
> + int ret;
> +
> + if (!rcar_gen3_is_any_rphy_initialized(channel) && channel->irq >= 0) {
> + INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
> + ret = request_irq(channel->irq, rcar_gen3_phy_usb2_irq,
> + IRQF_SHARED, dev_name(channel->dev), channel);
> + if (ret < 0)
> + dev_err(channel->dev, "No irq handler (%d)\n",
> + channel->irq);
This could be in a single line :)
Should we continue on error here?
> + }
>
> /* Initialize USB2 part */
> val = readl(usb2_base + USB2_INT_ENABLE);
> @@ -433,6 +461,9 @@ static int rcar_gen3_phy_usb2_exit(struct phy *p)
> val &= ~USB2_INT_ENABLE_UCOM_INTEN;
> writel(val, usb2_base + USB2_INT_ENABLE);
>
> + if (channel->irq >= 0 && !rcar_gen3_is_any_rphy_initialized(channel))
> + free_irq(channel->irq, channel);
> +
> return 0;
> }
>
> @@ -503,23 +534,6 @@ static const struct phy_ops rz_g1c_phy_usb2_ops = {
> .owner = THIS_MODULE,
> };
>
> -static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
> -{
> - struct rcar_gen3_chan *ch = _ch;
> - void __iomem *usb2_base = ch->base;
> - u32 status = readl(usb2_base + USB2_OBINTSTA);
> - irqreturn_t ret = IRQ_NONE;
> -
> - if (status & USB2_OBINT_BITS) {
> - dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
> - writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
> - rcar_gen3_device_recognition(ch);
> - ret = IRQ_HANDLED;
> - }
> -
> - return ret;
> -}
> -
> static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
> {
> .compatible = "renesas,usb2-phy-r8a77470",
> @@ -598,7 +612,7 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
> struct phy_provider *provider;
> struct resource *res;
> const struct phy_ops *phy_usb2_ops;
> - int irq, ret = 0, i;
> + int ret = 0, i;
>
> if (!dev->of_node) {
> dev_err(dev, "This driver needs device tree\n");
> @@ -614,16 +628,8 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
> if (IS_ERR(channel->base))
> return PTR_ERR(channel->base);
>
> - /* call request_irq for OTG */
> - irq = platform_get_irq_optional(pdev, 0);
> - if (irq >= 0) {
> - INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
> - irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
> - IRQF_SHARED, dev_name(dev), channel);
> - if (irq < 0)
> - dev_err(dev, "No irq handler (%d)\n", irq);
> - }
> -
> + /* get irq number here and request_irq for OTG in phy_init */
> + channel->irq = platform_get_irq_optional(pdev, 0);
> channel->dr_mode = rcar_gen3_get_dr_mode(dev->of_node);
> if (channel->dr_mode != USB_DR_MODE_UNKNOWN) {
> int ret;
> --
> 2.7.4
--
~Vinod
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