linux-toradex.git/drivers/gpu/drm/tinydrm/core, branch master

drm/tinydrm: Move tinydrm_display_pipe_init() to mipi-dbi

2019-07-23T13:50:46+00:00

tinydrm_display_pipe_init() has only one user now, so move it to mipi-dbi.

Changes:
- Remove drm_connector_helper_funcs.detect, it's always connected.
- Store the connector and mode in mipi_dbi instead of it's own struct.

Otherwise remove some leftover tinydrm-helpers.h inclusions.

Cc: Eric Anholt 
Cc: David Lechner 
Reviewed-by: Sam Ravnborg 
Signed-off-by: Noralf Trønnes 
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-12-noralf@tronnes.org

drm/tinydrm: Move tinydrm_spi_transfer()

2019-07-23T13:47:33+00:00

This is only used by mipi-dbi drivers so move it there.

The reason this isn't moved to the SPI subsystem is that it will in a
later patch pass a dummy rx buffer for SPI controllers that need this.
Low memory boards (64MB) can run into a problem allocating such a "large"
contiguous buffer on every transfer after a long up time.
This leaves a very specific use case, so we'll keep the function here.
mipi-dbi will first go through a refactoring though, before this will
be done.

Remove SPI todo entry now that we're done with the tinydrm.ko SPI code.

v2: Drop moving the mipi_dbi_spi_init() declaration (Sam)

Cc: David Lechner 
Reviewed-by: Sam Ravnborg 
Acked-by: : David Lechner 
Signed-off-by: Noralf Trønnes 
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-8-noralf@tronnes.org

drm/tinydrm: Clean up tinydrm_spi_transfer()

2019-07-23T13:46:56+00:00

Prep work before moving the function to mipi-dbi.

tinydrm_spi_transfer() was made to support one class of drivers in
drivers/staging/fbtft that has not been converted to DRM yet, so strip
away the unused functionality:
- Start byte (header) is not used.
- No driver relies on the automatic 16-bit byte swapping on little endian
  machines with SPI controllers only supporting 8 bits per word.

Other changes:
- No need to initialize ret
- No need for the WARN since mipi-dbi only uses 8 and 16 bpw.
- Use spi_message_init_with_transfers()

Cc: David Lechner 
Acked-by: : David Lechner 
Signed-off-by: Noralf Trønnes 
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-7-noralf@tronnes.org

drm/tinydrm: Remove tinydrm_spi_max_transfer_size()

2019-07-23T13:46:27+00:00

spi-bcm2835 can handle >64kB buffers now so there is no need to check
->max_dma_len. The tinydrm_spi_max_transfer_size() max_len argument is
not used by any callers, so not needed.

Then we have the spi_max module parameter. It was added because
staging/fbtft has support for it and there was a report that someone used
it to set a small buffer size to avoid popping on a USB soundcard on a
Raspberry Pi. In hindsight it shouldn't have been added, I should have
waited for it to become a problem first. I don't know it anyone is
actually using it, but since tinydrm_spi_transfer() is being moved to
mipi-dbi, I'm taking the opportunity to remove it. I'll add it back to
mipi-dbi if someone complains.

With that out of the way, spi_max_transfer_size() can be used instead.

The chosen 16kB buffer size for Type C Option 1 (9-bit) interface is
somewhat arbitrary, but a bigger buffer will have a miniscule impact on
transfer speed, so it's probably fine.

Acked-by: Sam Ravnborg 
Signed-off-by: Noralf Trønnes 
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-6-noralf@tronnes.org

drm/tinydrm: Remove spi debug buffer dumping

2019-07-23T13:45:56+00:00

The SPI event tracing can dump the buffer now so no need for this.
Remove the debug print from tinydrm_spi_transfer() since this info can be
gleaned from the trace event.

Reviewed-by: Sam Ravnborg 
Signed-off-by: Noralf Trønnes 
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-5-noralf@tronnes.org

drm/tinydrm: Use spi_is_bpw_supported()

2019-07-23T13:45:31+00:00

This means that tinydrm_spi_bpw_supported() can be removed.

Reviewed-by: Sam Ravnborg 
Signed-off-by: Noralf Trønnes 
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-4-noralf@tronnes.org

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

drm: move tinydrm format conversion helpers to new drm_format_helper.c

2019-04-08T04:59:26+00:00

Also rename them from tinydrm_* to drm_fb_*
Pure code motion, no functional change.

Signed-off-by: Gerd Hoffmann 
Reviewed-by: Sam Ravnborg 
Reviewed-by: Noralf Trønnes 
Link: http://patchwork.freedesktop.org/patch/msgid/20190405095219.9231-2-kraxel@redhat.com

drm/tinydrm: Remove tinydrm_device

2019-03-04T14:31:27+00:00

No more users left so it can go alongside its helpers.
Update the tinydrm docs description and remove todo entry.

Signed-off-by: Noralf Trønnes 
Reviewed-by: Sam Ravnborg 
Acked-by: Daniel Vetter 
Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-7-noralf@tronnes.org