* [PATCH] Avoid delay when initializing USB peripheral by dwc2
@ 2021-03-17 15:51 João Loureiro
0 siblings, 0 replies; 3+ messages in thread
From: João Loureiro @ 2021-03-17 15:51 UTC (permalink / raw)
To: u-boot
From: Jo?o Loureiro <joao.loureiro@nedap.com>
When `usb start` is called on the terminal, the dwc2 driver will try
to start every USB device as host first, even if it is explicitly
configured as peripheral in the device tree (dr_mode = "peripheral").
So to avoid an unwanted 15 seconds delay when initializing the usb
(one second per channel = 1s x 15), this patch adds a check to the
initialization, and will skip host initialization of the device is
explicitly set as peripheral. The checking is already done similarly
in the `drivers/usb/gadget/dwc2_udc_otg.c` driver.
Signed-off-by: Jo?o Loureiro <joaofl@gmail.com>
---
drivers/usb/host/dwc2.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index ec643e9f45..43cc2e0433 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -21,6 +21,7 @@
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/delay.h>
+#include <linux/usb/otg.h>
#include <power/regulator.h>
#include <reset.h>
@@ -1204,7 +1205,13 @@ static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv)
#endif
dwc_otg_core_init(dev);
- dwc_otg_core_host_init(dev, regs);
+
+ if (usb_get_dr_mode(dev_ofnode(dev)) == USB_DR_MODE_PERIPHERAL) {
+ dev_dbg(dev, "USB device %s dr_mode set to %d. Skipping host_init.\n",
+ dev->name, usb_get_dr_mode(dev_ofnode(dev)));
+ } else {
+ dwc_otg_core_host_init(dev, regs);
+ }
clrsetbits_le32(®s->hprt0, DWC2_HPRT0_PRTENA |
DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH] Avoid delay when initializing USB peripheral by dwc2
2021-03-17 15:52 João Loureiro
@ 2021-03-19 2:19 ` Marek Vasut
0 siblings, 0 replies; 3+ messages in thread
From: Marek Vasut @ 2021-03-19 2:19 UTC (permalink / raw)
To: u-boot
On 3/17/21 4:52 PM, Jo?o Loureiro wrote:
> When `usb start` is called on the terminal, the dwc2 driver will try
> to start every USB device as host first, even if it is explicitly
> configured as peripheral in the device tree (dr_mode = "peripheral").
>
> So to avoid an unwanted 15 seconds delay when initializing the usb
> (one second per channel = 1s x 15), this patch adds a check to the
> initialization, and will skip host initialization of the device is
> explicitly set as peripheral. The checking is already done similarly
> in the `drivers/usb/gadget/dwc2_udc_otg.c` driver.
[...]
> ---
> drivers/usb/host/dwc2.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
A few more things, next time you send a subsequent version of the patch,
use PATCH vX and document the patch changelog below the diffstat (i.e.
V2: changed foo because bar).
Also, add tags to subject, for this patch it would be "usb: dwc2:". I
can fill them in when applying, but in case there is a V3 of this patch,
update those in your tree too.
Finally, use ./scripts/get_maintainer to find out who to CC. I'm adding
a few more DWC2 users.
> diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
> index ec643e9f45..43cc2e0433 100644
> --- a/drivers/usb/host/dwc2.c
> +++ b/drivers/usb/host/dwc2.c
> @@ -21,6 +21,7 @@
> #include <asm/io.h>
> #include <dm/device_compat.h>
> #include <linux/delay.h>
> +#include <linux/usb/otg.h>
> #include <power/regulator.h>
> #include <reset.h>
>
> @@ -1204,7 +1205,13 @@ static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv)
> #endif
>
> dwc_otg_core_init(dev);
> - dwc_otg_core_host_init(dev, regs);
> +
> + if (usb_get_dr_mode(dev_ofnode(dev)) == USB_DR_MODE_PERIPHERAL) {
> + dev_dbg(dev, "USB device %s dr_mode set to %d. Skipping host_init.\n",
> + dev->name, usb_get_dr_mode(dev_ofnode(dev)));
> + } else {
> + dwc_otg_core_host_init(dev, regs);
> + }
>
> clrsetbits_le32(®s->hprt0, DWC2_HPRT0_PRTENA |
> DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |
>
[...]
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] Avoid delay when initializing USB peripheral by dwc2
@ 2021-03-17 15:52 João Loureiro
2021-03-19 2:19 ` Marek Vasut
0 siblings, 1 reply; 3+ messages in thread
From: João Loureiro @ 2021-03-17 15:52 UTC (permalink / raw)
To: u-boot
When `usb start` is called on the terminal, the dwc2 driver will try
to start every USB device as host first, even if it is explicitly
configured as peripheral in the device tree (dr_mode = "peripheral").
So to avoid an unwanted 15 seconds delay when initializing the usb
(one second per channel = 1s x 15), this patch adds a check to the
initialization, and will skip host initialization of the device is
explicitly set as peripheral. The checking is already done similarly
in the `drivers/usb/gadget/dwc2_udc_otg.c` driver.
Signed-off-by: Jo?o Loureiro <joaofl@gmail.com>
---
drivers/usb/host/dwc2.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index ec643e9f45..43cc2e0433 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -21,6 +21,7 @@
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/delay.h>
+#include <linux/usb/otg.h>
#include <power/regulator.h>
#include <reset.h>
@@ -1204,7 +1205,13 @@ static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv)
#endif
dwc_otg_core_init(dev);
- dwc_otg_core_host_init(dev, regs);
+
+ if (usb_get_dr_mode(dev_ofnode(dev)) == USB_DR_MODE_PERIPHERAL) {
+ dev_dbg(dev, "USB device %s dr_mode set to %d. Skipping host_init.\n",
+ dev->name, usb_get_dr_mode(dev_ofnode(dev)));
+ } else {
+ dwc_otg_core_host_init(dev, regs);
+ }
clrsetbits_le32(®s->hprt0, DWC2_HPRT0_PRTENA |
DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-03-19 2:19 UTC | newest]
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2021-03-17 15:51 [PATCH] Avoid delay when initializing USB peripheral by dwc2 João Loureiro
2021-03-17 15:52 João Loureiro
2021-03-19 2:19 ` Marek Vasut
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