Mixer soft reset is a recommended step before reconfiguring the mixer after power on. Mixer looses the previous state of DMAs if soft reset. This is the recommendation from the hardware team.
Signed-off-by: Rahul Sharma rahul.sharma@samsung.com --- drivers/gpu/drm/exynos/exynos_mixer.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c index 6773b03..6f18581 100644 --- a/drivers/gpu/drm/exynos/exynos_mixer.c +++ b/drivers/gpu/drm/exynos/exynos_mixer.c @@ -1085,6 +1085,8 @@ static void mixer_poweron(struct exynos_drm_manager *mgr) ctx->powered = true; mutex_unlock(&ctx->mixer_mutex);
+ mixer_reg_writemask(res, MXR_STATUS, ~0, MXR_STATUS_SOFT_RESET); + mixer_reg_write(res, MXR_INT_EN, ctx->int_en); mixer_win_reset(ctx);