CONFIG_VIDEO_FB_IVTV_FORCE_PAT: force cx23415 framebuffer init with x86 PAT enabled

General informations

The Linux kernel configuration item CONFIG_VIDEO_FB_IVTV_FORCE_PAT:

• prompt: force cx23415 framebuffer init with x86 PAT enabled
• type: bool
• depends on: CONFIG_VIDEO_FB_IVTV && CONFIG_X86_PAT
• defined in drivers/media/pci/ivtv/Kconfig
• found in Linux kernels: 5.1–5.19, 6.0–6.12

Help text

With PAT enabled, the cx23415 framebuffer driver does not utilize write-combined caching on the framebuffer memory. For this reason, the driver will by default disable itself when initializied on a kernel with PAT enabled (i.e. not using the nopat kernel parameter).

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.

With this setting enabled, the framebuffer will initialize on PAT-enabled systems but the framebuffer memory will be uncached.

If unsure, say N.

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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