083a6c23b9
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 <david@lechnology.com> Acked-by: : David Lechner <david@lechnology.com> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-7-noralf@tronnes.org
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2016 Noralf Trønnes
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*/
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#ifndef __LINUX_TINYDRM_HELPERS_H
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#define __LINUX_TINYDRM_HELPERS_H
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struct backlight_device;
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struct drm_device;
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struct drm_display_mode;
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struct drm_framebuffer;
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struct drm_rect;
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struct drm_simple_display_pipe;
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struct drm_simple_display_pipe_funcs;
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struct spi_transfer;
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struct spi_device;
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struct device;
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/**
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* tinydrm_machine_little_endian - Machine is little endian
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*
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* Returns:
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* true if *defined(__LITTLE_ENDIAN)*, false otherwise
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*/
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static inline bool tinydrm_machine_little_endian(void)
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{
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#if defined(__LITTLE_ENDIAN)
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return true;
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#else
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return false;
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#endif
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}
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int tinydrm_display_pipe_init(struct drm_device *drm,
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struct drm_simple_display_pipe *pipe,
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const struct drm_simple_display_pipe_funcs *funcs,
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int connector_type,
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const uint32_t *formats,
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unsigned int format_count,
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const struct drm_display_mode *mode,
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unsigned int rotation);
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int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
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u8 bpw, const void *buf, size_t len);
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#endif /* __LINUX_TINYDRM_HELPERS_H */
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