From fe0ac8a5f94fc276b34a34a3d61d7cf8b9658dc9 Mon Sep 17 00:00:00 2001 From: Rahul Sharma Date: Mon, 23 Jun 2014 11:02:22 +0530 Subject: [PATCH] drm/exynos: stop mixer before gating clocks during poweroff Mixer should be power gated only after it is gracefully stopped. The recommended sequence is to Stop the mixer and wait till it enters to IDLE state before gating the clocks and power to the mixer. Signed-off-by: Rahul Sharma Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_mixer.c | 15 +++++++++++++++ drivers/gpu/drm/exynos/regs-mixer.h | 1 + 2 files changed, 16 insertions(+) diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c index c00abbe3cd139..d35950121fc42 100644 --- a/drivers/gpu/drm/exynos/exynos_mixer.c +++ b/drivers/gpu/drm/exynos/exynos_mixer.c @@ -377,6 +377,20 @@ static void mixer_run(struct mixer_context *ctx) mixer_regs_dump(ctx); } +static void mixer_stop(struct mixer_context *ctx) +{ + struct mixer_resources *res = &ctx->mixer_res; + int timeout = 20; + + mixer_reg_writemask(res, MXR_STATUS, 0, MXR_STATUS_REG_RUN); + + while (!(mixer_reg_read(res, MXR_STATUS) & MXR_STATUS_REG_IDLE) && + --timeout) + usleep_range(10000, 12000); + + mixer_regs_dump(ctx); +} + static void vp_video_buffer(struct mixer_context *ctx, int win) { struct mixer_resources *res = &ctx->mixer_res; @@ -1094,6 +1108,7 @@ static void mixer_poweroff(struct exynos_drm_manager *mgr) } mutex_unlock(&ctx->mixer_mutex); + mixer_stop(ctx); mixer_window_suspend(mgr); ctx->int_en = mixer_reg_read(res, MXR_INT_EN); diff --git a/drivers/gpu/drm/exynos/regs-mixer.h b/drivers/gpu/drm/exynos/regs-mixer.h index 4537026bc385f..5f32e1a294118 100644 --- a/drivers/gpu/drm/exynos/regs-mixer.h +++ b/drivers/gpu/drm/exynos/regs-mixer.h @@ -78,6 +78,7 @@ #define MXR_STATUS_BIG_ENDIAN (1 << 3) #define MXR_STATUS_ENDIAN_MASK (1 << 3) #define MXR_STATUS_SYNC_ENABLE (1 << 2) +#define MXR_STATUS_REG_IDLE (1 << 1) #define MXR_STATUS_REG_RUN (1 << 0) /* bits for MXR_CFG */ -- 2.39.5