kernel.git/drivers/gpu/drm/udl/udl_transfer.c, branch linux-5.13.y

drm/udl: Remove field lost_pixels from struct udl_device

2019-12-06T12:52:33Z

The field lost_pixels in struct udl_device was supposed to signal an error during USB transfers of the framebuffer data. The driver would have to schedule a re-transfer at a later point. This code was never implemented. Remove lost_pixels and return regular error codes instead. Signed-off-by: Thomas Zimmermann Reviewed-by: Emil Velikov Acked-by: Gerd Hoffmann Link: https://patchwork.freedesktop.org/patch/msgid/20191206085954.9697-8-tzimmermann@suse.de

drm/udl: Vmap framebuffer after all tests succeeded in damage handling

2019-12-06T12:51:32Z

We now do the fast tests before the potentially expensive vmap operation. Signed-off-by: Thomas Zimmermann Reviewed-by: Emil Velikov Acked-by: Gerd Hoffmann Link: https://patchwork.freedesktop.org/patch/msgid/20191206085954.9697-4-tzimmermann@suse.de

drm/udl: Don't track number of identical and sent pixels per line

2019-12-06T12:51:23Z

A call to udl_render_hline() returns the number of identical and sent pixels. None of these values is used. Remove the parameters. Signed-off-by: Thomas Zimmermann Reviewed-by: Emil Velikov Acked-by: Gerd Hoffmann Link: https://patchwork.freedesktop.org/patch/msgid/20191206085954.9697-3-tzimmermann@suse.de

drm/udl: drop use of drmP.h

2019-07-17T10:52:55Z

The drmP.h header file is deprecated. Drop it from all files in the udl driver. Made the header files self contained, which then made it simpler to update the .c files. Signed-off-by: Sam Ravnborg Acked-by: Emil Velikov Reviewed-by: Alex Deucher Cc: Sean Paul Cc: David Airlie Cc: Daniel Vetter Cc: Jani Nikula Cc: Robert Tarasov Cc: Oleksandr Andrushchenko Cc: Thomas Zimmermann Cc: "Noralf Trønnes" Cc: Eric Anholt Cc: Mikulas Patocka Cc: Emil Lundmark Cc: Eugeniy Paltsev Link: https://patchwork.freedesktop.org/patch/msgid/20190716064220.18157-9-sam@ravnborg.org

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 262

2019-06-05T15:30:28Z

Based on 1 normalized pattern(s): this file is subject to the terms and conditions of the gnu general public license v2 see the file copying in the main directory of this archive for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 11 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141333.582369016@linutronix.de Signed-off-by: Greg Kroah-Hartman

udl-kms: avoid prefetch

2018-07-30T22:11:12Z

Modern processors can detect linear memory accesses and prefetch data automatically, so there's no need to use prefetch. Signed-off-by: Mikulas Patocka Signed-off-by: Dave Airlie

udl-kms: avoid division

2018-07-30T22:11:12Z

Division is slow, so it shouldn't be done by the pixel generating code. The driver supports only 2 or 4 bytes per pixel, so we can replace division with a shift. Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie

drm/udl: fix display corruption of the last line

2018-07-05T06:44:51Z

The displaylink hardware has such a peculiarity that it doesn't render a command until next command is received. This produces occasional corruption, such as when setting 22x11 font on the console, only the first line of the cursor will be blinking if the cursor is located at some specific columns. When we end up with a repeating pixel, the driver has a bug that it leaves one uninitialized byte after the command (and this byte is enough to flush the command and render it - thus it fixes the screen corruption), however whe we end up with a non-repeating pixel, there is no byte appended and this results in temporary screen corruption. This patch fixes the screen corruption by always appending a byte 0xAF at the end of URB. It also removes the uninitialized byte. Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie

drm/udl: Fix unaligned memory access in udl_render_hline

2017-04-11T13:21:30Z

On SPARC, the udl driver filled my kernel log with these messages: [186668.910612] Kernel unaligned access at TPC[76609c] udl_render_hline+0x13c/0x3a0 Use put_unaligned_be16 to avoid them. On x86 this results in the same code, but on SPARC the compiler emits two single-byte stores. Signed-off-by: Jonathan Neuschäfer Acked-by: David Airlie Signed-off-by: Sean Paul Link: http://patchwork.freedesktop.org/patch/msgid/20170407200229.20642-1-j.neuschaefer@gmx.net

drm/udl: optimize udl_compress_hline16 (v2)

2015-01-31T00:08:47Z

The run-length encoding algorithm should compare 16-bit encoded pixel values instead of comparing raw pixel values. It allows pixels with similar but different colors to be encoded as repeat pixels, and thus potentially save USB bandwidth. Signed-off-by: Haixia Shi Reviewed-by: Daniel Kurtz Tested-by: Haixia Shi Signed-off-by: Dave Airlie