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SubjectRe: [PATCH 07/12] drm/udl: Add parameter to set number of URBs
From
Hi

Am 16.08.22 um 17:36 schrieb Takashi Iwai:
> From: Thomas Zimmermann <tzimmermann@suse.de>
>
> For further debugging and optimization purpose, allow users to adjust
> the number of URBs via a new module parameter, numurbs.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>

I made this patch for debugging, but I don't think it should be added to
the upstream kernel. Please don't merge.

Best regards
Thomas

> ---
> drivers/gpu/drm/udl/udl_main.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
> index 2b7eafd48ec2..3c97f647883f 100644
> --- a/drivers/gpu/drm/udl/udl_main.c
> +++ b/drivers/gpu/drm/udl/udl_main.c
> @@ -8,6 +8,8 @@
> * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
> */
>
> +#include <linux/moduleparam.h>
> +
> #include <drm/drm.h>
> #include <drm/drm_print.h>
> #include <drm/drm_probe_helper.h>
> @@ -23,6 +25,9 @@
> #define WRITES_IN_FLIGHT (20)
> #define MAX_VENDOR_DESCRIPTOR_SIZE 256
>
> +static uint udl_num_urbs = WRITES_IN_FLIGHT;
> +module_param_named(numurbs, udl_num_urbs, uint, 0600);
> +
> static int udl_parse_vendor_descriptor(struct udl_device *udl)
> {
> struct usb_device *udev = udl_to_usb_device(udl);
> @@ -294,6 +299,8 @@ int udl_init(struct udl_device *udl)
> struct drm_device *dev = &udl->drm;
> int ret = -ENOMEM;
>
> + drm_info(dev, "pre-allocating %d URBs\n", udl_num_urbs);
> +
> DRM_DEBUG("\n");
>
> udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
> @@ -311,7 +318,7 @@ int udl_init(struct udl_device *udl)
> if (udl_select_std_channel(udl))
> DRM_ERROR("Selecting channel failed\n");
>
> - if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
> + if (!udl_alloc_urb_list(dev, udl_num_urbs, MAX_TRANSFER)) {
> DRM_ERROR("udl_alloc_urb_list failed\n");
> goto err;
> }

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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