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Touching HW while clocks are off is a serious error and for instance breaks suspend functionality. After this patch tilcdc_crtc_update_fb() always updates the primary plane's framebuffer pointer, increases fb's reference count and stores vblank event. tilcdc_crtc_update_fb() only writes the fb's DMA address to HW if the crtc is enabled, as tilcdc_crtc_enable() takes care of writing the address on enable. This patch also refactors the tilcdc_crtc_update_fb() a bit. Number of subsequent small changes had made it almost unreadable. There should be no other functional changes but checking the CRTC's enable state. However, the locking goes a bit differently and some of the redundant checks have been removed in this new version. The enable_lock should be enough to protect the access to tilcdc_crtc->enabled. The irq_lock protects the access to last_vblank and next_fb. The check for vrefresh and last_vblank being valid is redundant, as the vrefresh should be always valid if the CRTC is enabled and now last_vblank should be too, because it is initialized to current time when CRTC raster is enabled. If for some reason the values are not correctly initialized the division by zero warning is quite appropriate. Signed-off-by: Jyri Sarha <jsarha@ti.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.