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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 <rahul.sharma@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Rahul Sharma 2014-06-23 11:02:22 +05:30 committed by Inki Dae
parent b4bfa3c7d0
commit 381be025ac
2 changed files with 16 additions and 0 deletions
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15
drivers/gpu/drm/exynos/exynos_mixer.c
View File

@ -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);

1
drivers/gpu/drm/exynos/regs-mixer.h
View File

@ -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 */