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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2020-07-17 14:44:56 +0300
committerVinod Koul <vkoul@kernel.org>2020-07-20 09:33:44 +0300
commit08b0ad375ca66181faee725b1b358bcae8d592ee (patch)
tree0a5873f255d7e5e1fafce85f4ebac36905348306 /drivers/phy
parentdc171790c729db72774fd076485b86f92954544b (diff)
downloadlinux-08b0ad375ca66181faee725b1b358bcae8d592ee.tar.xz
phy: renesas: rcar-gen3-usb2: move irq registration to init
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@sang-engineering.com> Reported-by: Geert Uytterhoeven <geert+renesas@glider.be> Fixes: 9f391c574efc ("phy: rcar-gen3-usb2: add runtime ID/VBUS pin detection") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/1594986297-12434-2-git-send-email-yoshihiro.shimoda.uh@renesas.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/renesas/phy-rcar-gen3-usb2.c61
1 files changed, 33 insertions, 28 deletions
diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index bfb22f868857..5087b7c44d55 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 +390,38 @@ 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);
+ }
/* Initialize USB2 part */
val = readl(usb2_base + USB2_INT_ENABLE);
@@ -433,6 +460,9 @@ 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 +533,6 @@ 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 +611,7 @@ 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 +627,8 @@ 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;