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Message-Id: <CX4NJXCYMSJ1.AF8FQLHU77RU@tleb-bootlin-xps13-01>
Date: Tue, 21 Nov 2023 18:06:01 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: "Roger Quadros" <rogerq@...nel.org>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
"Rob Herring" <robh+dt@...nel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
"Conor Dooley" <conor+dt@...nel.org>,
"Peter Chen" <peter.chen@...nel.org>,
"Pawel Laszczak" <pawell@...ence.com>,
"Nishanth Menon" <nm@...com>,
"Vignesh Raghavendra" <vigneshr@...com>,
"Tero Kristo" <kristo@...nel.org>
Cc: <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Grégory Clement <gregory.clement@...tlin.com>
Subject: Re: [PATCH v2 6/7] usb: cdns3-ti: signal reset-on-resume to xHCI
for J7200 platform
Hello,
On Tue Nov 21, 2023 at 5:53 PM CET, Roger Quadros wrote:
> On 20/11/2023 19:06, Théo Lebrun wrote:
> > Pass CDNS3_RESET_ON_RESUME as platform data to cdns3 host role. It will
> > in turn pass it down to xHCI platform data as XHCI_RESET_ON_RESUME.
> >
> > Avoid this warning on resume:
> >
> > [ 16.017462] xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit
> >
> > When used, remote wakeup is not expected to work.
> >
> > Only focus J7200 as other SoC are untested.
> >
> > Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> > ---
> > drivers/usb/cdns3/cdns3-ti.c | 19 +++++++++++++++++--
> > 1 file changed, 17 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
> > index 84f93c2fcd5c..7d56a1acbc54 100644
> > --- a/drivers/usb/cdns3/cdns3-ti.c
> > +++ b/drivers/usb/cdns3/cdns3-ti.c
> > @@ -16,6 +16,7 @@
> > #include <linux/of_platform.h>
> > #include <linux/pm_runtime.h>
> > #include <linux/property.h>
> > +#include "core.h"
> >
> > /* USB Wrapper register offsets */
> > #define USBSS_PID 0x0
> > @@ -128,6 +129,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
> > {
> > struct device *dev = &pdev->dev;
> > struct device_node *node = pdev->dev.of_node;
> > + const struct of_dev_auxdata *auxdata;
> > struct cdns_ti *data;
> > unsigned long rate;
> > int error, i;
> > @@ -177,7 +179,8 @@ static int cdns_ti_probe(struct platform_device *pdev)
> >
> > cdns_ti_init_hw(data);
> >
> > - error = of_platform_populate(node, NULL, NULL, dev);
> > + auxdata = of_device_get_match_data(dev);
> > + error = of_platform_populate(node, NULL, auxdata, dev);
> > if (error) {
> > dev_err(dev, "failed to create children: %d\n", error);
> > return error;
> > @@ -222,8 +225,20 @@ static const struct dev_pm_ops cdns_ti_pm_ops = {
> >
> > #endif /* CONFIG_PM */
> >
> > +static struct cdns3_platform_data cdns_ti_j7200_pdata = {
> > + .quirks = CDNS3_RESET_ON_RESUME,
> > +};
>
> We will need to introduce a new data structure "struct cdns_ti_platform_data"
> and add platform specific details like "reset_on_resume" to it.
> This is to address what Krzysztof pointed to in patch 4.
Yes I've got it locally following Krzysztof's review. Below my signature
is a sneak peak as I'll wait a bit more before a V3. First we implement
resume behavior in the wrapper driver using match data then we add
auxdata passed to the subdevices.
Regards,
--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
------------------------------------------------------------------------
>From 69a59e3408668dfa06d3790cb20948961708791d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20Lebrun?= <theo.lebrun@...tlin.com>
Date: Mon, 20 Nov 2023 16:47:29 +0100
Subject: [PATCH 05/13] usb: cdns3-ti: add suspend/resume procedures for J7200
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Hardware initialisation is only done at probe. The J7200 USB controller
is reset at resume because of power-domains toggling off & on. We
therefore reconfigure the hardware at resume.
Reuse the newly extracted cdns_ti_init_hw() function that contains the
register write sequence.
Only focus J7200 as other SoC are untested. If the controller does not
reset we do not want to redo reg writes.
Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
drivers/usb/cdns3/cdns3-ti.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
index d4232b440e4e..7530b6b5159d 100644
--- a/drivers/usb/cdns3/cdns3-ti.c
+++ b/drivers/usb/cdns3/cdns3-ti.c
@@ -58,6 +58,11 @@ struct cdns_ti {
struct clk *usb2_refclk;
struct clk *lpm_clk;
int usb2_refclk_rate_code;
+ const struct cdns_ti_match_data *match_data;
+};
+
+struct cdns_ti_match_data {
+ bool reset_on_resume;
};
static const int cdns_ti_rate_table[] = { /* in KHZ */
@@ -138,6 +143,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
data->dev = dev;
+ data->match_data = of_device_get_match_data(dev);
data->usbss = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->usbss)) {
@@ -202,7 +208,30 @@ static void cdns_ti_remove(struct platform_device *pdev)
platform_set_drvdata(pdev, NULL);
}
+#ifdef CONFIG_PM
+
+static int cdns_ti_resume(struct device *dev)
+{
+ struct cdns_ti *data = dev_get_drvdata(dev);
+
+ if (data->match_data && data->match_data->reset_on_resume)
+ cdns_ti_init_hw(data);
+
+ return 0;
+}
+
+static const struct dev_pm_ops cdns_ti_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(NULL, cdns_ti_resume)
+};
+
+#endif /* CONFIG_PM */
+
+static const struct cdns_ti_match_data cdns_ti_j7200_match_data = {
+ .reset_on_resume = true,
+};
+
static const struct of_device_id cdns_ti_of_match[] = {
+ { .compatible = "ti,j7200-usb", .data = &cdns_ti_j7200_match_data, },
{ .compatible = "ti,j721e-usb", },
{ .compatible = "ti,am64-usb", },
{},
@@ -213,8 +242,9 @@ static struct platform_driver cdns_ti_driver = {
.probe = cdns_ti_probe,
.remove_new = cdns_ti_remove,
.driver = {
- .name = "cdns3-ti",
+ .name = "cdns3-ti",
.of_match_table = cdns_ti_of_match,
+ .pm = pm_ptr(&cdns_ti_pm_ops),
},
};
--
2.42.0
------------------------------------------------------------------------
>From 4ff91a036da297e9e8585980c6133bee9c45d9a6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20Lebrun?= <theo.lebrun@...tlin.com>
Date: Mon, 20 Nov 2023 17:02:44 +0100
Subject: [PATCH 07/13] usb: cdns3-ti: signal reset-on-resume to xHCI for J7200
platform
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Pass CDNS3_RESET_ON_RESUME as platform data to cdns3 host role. It will
in turn pass it down to xHCI platform data as XHCI_RESET_ON_RESUME.
Avoid this warning on resume:
[ 16.017462] xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit
When used, remote wakeup is not expected to work.
Only focus J7200 as other SoC are untested.
Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
drivers/usb/cdns3/cdns3-ti.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
index 7530b6b5159d..da2648ebc179 100644
--- a/drivers/usb/cdns3/cdns3-ti.c
+++ b/drivers/usb/cdns3/cdns3-ti.c
@@ -16,6 +16,7 @@
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
+#include "core.h"
/* USB Wrapper register offsets */
#define USBSS_PID 0x0
@@ -62,7 +63,8 @@ struct cdns_ti {
};
struct cdns_ti_match_data {
- bool reset_on_resume;
+ bool reset_on_resume;
+ const struct of_dev_auxdata *auxdata;
};
static const int cdns_ti_rate_table[] = { /* in KHZ */
@@ -132,6 +134,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = pdev->dev.of_node;
+ const struct of_dev_auxdata *auxdata = NULL;
struct cdns_ti *data;
unsigned long rate;
int error, i;
@@ -181,7 +184,9 @@ static int cdns_ti_probe(struct platform_device *pdev)
cdns_ti_init_hw(data);
- error = of_platform_populate(node, NULL, NULL, dev);
+ if (data->match_data)
+ auxdata = data->match_data->auxdata;
+ error = of_platform_populate(node, NULL, auxdata, dev);
if (error) {
dev_err(dev, "failed to create children: %d\n", error);
return error;
@@ -226,8 +231,21 @@ static const struct dev_pm_ops cdns_ti_pm_ops = {
#endif /* CONFIG_PM */
+static struct cdns3_platform_data cdns_ti_j7200_pdata = {
+ .quirks = CDNS3_RESET_ON_RESUME,
+};
+
+static const struct of_dev_auxdata cdns_ti_j7200_auxdata[] = {
+ {
+ .compatible = "cdns,usb3",
+ .platform_data = &cdns_ti_j7200_pdata,
+ },
+ {},
+};
+
static const struct cdns_ti_match_data cdns_ti_j7200_match_data = {
.reset_on_resume = true,
+ .auxdata = cdns_ti_j7200_auxdata,
};
static const struct of_device_id cdns_ti_of_match[] = {
--
2.42.0
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