drm/tilcdc: Precalculate total frametime in tilcdc_crtc_set_mode()

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commit ce99f7206c upstream.

We need the total frame refresh time to check if we are too close to
vertical sync when updating the two framebuffer DMA registers and risk
a collision. This new method is more accurate that the previous that
based on mode's vrefresh value, which itself is inaccurate or may not
even be initialized.

Reported-by: Kevin Hao <kexin.hao@windriver.com>
Fixes: 11abbc9f39 ("drm/tilcdc: Set framebuffer DMA address to HW only if CRTC is enabled")
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jyri Sarha 2017-10-12 12:19:46 +03:00 • committed by Greg Kroah-Hartman

parent a5851fdb17

commit e3c5870862

1 changed files with 12 additions and 1 deletions

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drivers/gpu/drm/tilcdc/tilcdc_crtc.c

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