526daee730
ivtvfb was previously disabled for x86 PAT-enabled systems
by commit 1bf1735b47 ("x86/mm/pat, drivers/media/ivtv:
Use arch_phys_wc_add() and require PAT disabled") as a
workaround to abstract MTRR code away from device drivers.
The driver is not easily upgradable to the PAT-aware
ioremap_wc() API since the firmware hides the address
ranges that should be marked write-combined from the driver.
However, since a write-combined cache on the framebuffer
is only a performance enhancement not a requirement for
the framebuffer to function, completely disabling the driver
in this configuration is not necessary.
Add force_pat module parameter and a corresponding kernel
configuration parameter to optionally force initialization
on PAT-enabled x86 systems with a warning about the lack of
write-combined caching, and document the reasons the driver
cannot be easily updated to support wc caching on all systems.
Signed-off-by: Nick French <naf@ou.edu>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil-cisco@xs4all.nl: fix typo, split long pr_ lines up]
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
95 lines
3 KiB
Plaintext
95 lines
3 KiB
Plaintext
config VIDEO_IVTV
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tristate "Conexant cx23416/cx23415 MPEG encoder/decoder support"
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depends on VIDEO_V4L2 && 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. There is a driver homepage at <http://www.ivtvdriver.org>.
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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_DEPRECATED_IOCTLS
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bool "enable the DVB ioctls abuse on ivtv driver"
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depends on VIDEO_IVTV
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default n
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---help---
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Enable the usage of the a DVB set of ioctls that were abused by
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IVTV driver for a while.
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Those ioctls were not needed for a long time, as IVTV implements
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the proper V4L2 ioctls since kernel 3.3.
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If unsure, say N.
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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_CFB_FILLRECT
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select FB_CFB_COPYAREA
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select FB_CFB_IMAGEBLIT
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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. There is a driver
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homepage at <http://www.ivtvdriver.org>.
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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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default n
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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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