It seems that the current size (4) for the URB list is too small on
some devices, and it resulted in the occasional stalls. Increase the
default URB list size to 20 for working around it.
Signed-off-by: Takashi Iwai <[email protected]>
---
drivers/gpu/drm/udl/udl_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 6aed6e0f669c..2b7eafd48ec2 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -20,7 +20,7 @@
#define NR_USB_REQUEST_CHANNEL 0x12
#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
-#define WRITES_IN_FLIGHT (4)
+#define WRITES_IN_FLIGHT (20)
#define MAX_VENDOR_DESCRIPTOR_SIZE 256
static int udl_parse_vendor_descriptor(struct udl_device *udl)
--
2.35.3
Hi
Am 16.08.22 um 17:36 schrieb Takashi Iwai:
> It seems that the current size (4) for the URB list is too small on
> some devices, and it resulted in the occasional stalls. Increase the
> default URB list size to 20 for working around it.
>
> Signed-off-by: Takashi Iwai <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
> ---
> drivers/gpu/drm/udl/udl_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
> index 6aed6e0f669c..2b7eafd48ec2 100644
> --- a/drivers/gpu/drm/udl/udl_main.c
> +++ b/drivers/gpu/drm/udl/udl_main.c
> @@ -20,7 +20,7 @@
> #define NR_USB_REQUEST_CHANNEL 0x12
>
> #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
> -#define WRITES_IN_FLIGHT (4)
> +#define WRITES_IN_FLIGHT (20)
> #define MAX_VENDOR_DESCRIPTOR_SIZE 256
>
> static int udl_parse_vendor_descriptor(struct udl_device *udl)
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev