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89c6ea2006
There's no VBLANK interrupt on Matrox chipsets. The workaround that is being used here and in other free Matrox drivers is to program <linecomp> to the value of <vblkstr> and enable the VLINE interrupt. This triggers an interrupt at the time when VBLANK begins. VLINE uses separate registers for enabling and clearing pending interrupts. No extra synchronization between irq handler and the rest of the driver is required. v6: - clear VLINE status bit before registering IRQ (Jocelyn) v5: - disable all interrupts before registering IRQ (Jocelyn) - don't read from ICLEAR (Jocelyn) v4: - recreate patch on latest upstream - use devm_request_irq() for managed cleanup - fail if vblanking cannot be initialized - rename register constants (Sam, Emil) - clear interrupt before registering handler (Ville) - move <linecomp> programming into separate commit - set <linecomp> to <vblkstr> - fix typo in commit message v3: - set <linecomp> to <vdisplay> + 1 to trigger at VBLANK - expand comment on linecomp v2: - only signal vblank on CRTC 0 - use constants for registers and fields - set VLINECLR before enabling interrupt - test against STATUS and IEN in irq handler - coding-style fixes Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Tested-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240718104551.575912-7-tzimmermann@suse.de
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.