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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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bff13b8f2c
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. This explictily sets the read/write, draw and mmap callbacks to the correct default implementation. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requireing the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. Set the callbacks via macros. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: linux-media@vger.kernel.org Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Link: https://patchwork.freedesktop.org/patch/msgid/20231127131655.4020-21-tzimmermann@suse.de
79 lines
2.5 KiB
Plaintext
79 lines
2.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config VIDEO_IVTV
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tristate "Conexant cx23416/cx23415 MPEG encoder/decoder support"
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depends on VIDEO_DEV && PCI && I2C
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select I2C_ALGOBIT
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depends on RC_CORE
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select VIDEO_TUNER
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select VIDEO_TVEEPROM
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select VIDEO_CX2341X
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select VIDEO_CX25840
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select VIDEO_MSP3400
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select VIDEO_SAA711X
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select VIDEO_SAA717X
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select VIDEO_SAA7127
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select VIDEO_CS53L32A
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select VIDEO_M52790
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select VIDEO_WM8775
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select VIDEO_WM8739
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select VIDEO_VP27SMPX
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select VIDEO_UPD64031A
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select VIDEO_UPD64083
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help
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This is a video4linux driver for Conexant cx23416 or cx23415 based
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PCI personal video recorder devices.
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This is used in devices such as the Hauppauge PVR-150/250/350/500
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cards.
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To compile this driver as a module, choose M here: the
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module will be called ivtv.
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config VIDEO_IVTV_ALSA
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tristate "Conexant cx23415/cx23416 ALSA interface for PCM audio capture"
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depends on VIDEO_IVTV && SND
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select SND_PCM
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help
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This driver provides an ALSA interface as another method for user
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applications to obtain PCM audio data from Conexant cx23415/cx23416
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based PCI TV cards supported by the ivtv driver.
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The ALSA interface has much wider use in user applications performing
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PCM audio capture, than the V4L2 "/dev/video24" PCM audio interface
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provided by the main ivtv driver.
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To compile this driver as a module, choose M here: the
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module will be called ivtv-alsa.
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config VIDEO_FB_IVTV
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tristate "Conexant cx23415 framebuffer support"
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depends on VIDEO_IVTV && FB
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select FB_IOMEM_HELPERS
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help
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This is a framebuffer driver for the Conexant cx23415 MPEG
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encoder/decoder.
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This is used in the Hauppauge PVR-350 card.
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To compile this driver as a module, choose M here: the
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module will be called ivtvfb.
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config VIDEO_FB_IVTV_FORCE_PAT
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bool "force cx23415 framebuffer init with x86 PAT enabled"
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depends on VIDEO_FB_IVTV && X86_PAT
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help
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With PAT enabled, the cx23415 framebuffer driver does not
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utilize write-combined caching on the framebuffer memory.
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For this reason, the driver will by default disable itself
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when initializied on a kernel with PAT enabled (i.e. not
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using the nopat kernel parameter).
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The driver is not easily upgradable to the PAT-aware
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ioremap_wc() API since the firmware hides the address
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ranges that should be marked write-combined from the driver.
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With this setting enabled, the framebuffer will initialize on
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PAT-enabled systems but the framebuffer memory will be uncached.
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If unsure, say N.
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