linux-kernel - [PATCH v2 02/11] drm/udl: Add reset

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Date:   Tue,  6 Sep 2022 09:39:42 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/11] drm/udl: Add reset_resume

From: Thomas Zimmermann <tzimmermann@...e.de>

Implement the reset_resume callback of struct usb_driver. Set the
standard channel when called.

Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/gpu/drm/udl/udl_drv.c  | 11 +++++++++++
 drivers/gpu/drm/udl/udl_drv.h  |  1 +
 drivers/gpu/drm/udl/udl_main.c |  2 +-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index 5703277c6f52..0ba88e5472a9 100644
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -32,6 +32,16 @@ static int udl_usb_resume(struct usb_interface *interface)
 	return drm_mode_config_helper_resume(dev);
 }
 
+static int udl_usb_reset_resume(struct usb_interface *interface)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+	struct udl_device *udl = to_udl(dev);
+
+	udl_select_std_channel(udl);
+
+	return drm_mode_config_helper_resume(dev);
+}
+
 /*
  * FIXME: Dma-buf sharing requires DMA support by the importing device.
  *        This function is a workaround to make USB devices work as well.
@@ -140,6 +150,7 @@ static struct usb_driver udl_driver = {
 	.disconnect = udl_usb_disconnect,
 	.suspend = udl_usb_suspend,
 	.resume = udl_usb_resume,
+	.reset_resume = udl_usb_reset_resume,
 	.id_table = id_table,
 };
 module_usb_driver(udl_driver);
diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index 28aaf75d71cf..37c14b0ff1fc 100644
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -95,6 +95,7 @@ int udl_render_hline(struct drm_device *dev, int log_bpp, struct urb **urb_ptr,
 		     u32 byte_offset, u32 device_byte_offset, u32 byte_width);
 
 int udl_drop_usb(struct drm_device *dev);
+int udl_select_std_channel(struct udl_device *udl);
 
 #define CMD_WRITE_RAW8   "\xAF\x60" /**< 8 bit raw write command. */
 #define CMD_WRITE_RL8    "\xAF\x61" /**< 8 bit run length command. */
diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index fdafbf8f3c3c..7d1e6bbc165c 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -92,7 +92,7 @@ static int udl_parse_vendor_descriptor(struct udl_device *udl)
 /*
  * Need to ensure a channel is selected before submitting URBs
  */
-static int udl_select_std_channel(struct udl_device *udl)
+int udl_select_std_channel(struct udl_device *udl)
 {
 	static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
 					 0x1C, 0x88, 0x5E, 0x15,
-- 
2.35.3