drm/imx/lcdc: avoid duplicate clk_per enable

The simple-KMS helper calls the pipe update after enabling the CRTC.
On an enable commit, imx_lcdc_pipe_enable() already programs the
mode and enables clk_per. The following pipe update sees the plane move
from no CRTC to the active CRTC, treats it as a mode update, and calls
imx_lcdc_update_hw_registers() again.

That second call has no old CRTC state to disable clk_per first, but it
enables clk_per again at the end. The disable path only drops one
reference, leaving clk_per enabled after each on/off cycle.

Skip the register update from the pipe update path when the CRTC already
needs a modeset. The enable path has already programmed the hardware for
that commit; keep the event handling in pipe update unchanged.

Fixes: c87e859cdeb5 ("drm/imx/lcdc: Implement DRM driver for imx25")
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Ze Huang <ze.huang@oss.qualcomm.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260919-b4-imx-simple-kms-v4-v4-1-53b1fdf4589e@oss.qualcomm.com

0 files changed, 0 insertions, 0 deletions