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drm/exynos: add check for the device power status 

V2: Add mutex protection, while read.

The hdmi and mixer win_commit calls currently are
not checking the status of IP before updating the
respective registers, this patch adds this check.

Signed-off-by: Shirish S <s.shirish@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Shirish S 2013-01-23 22:03:18 -05:00 committed by Inki Dae
parent 428982e70a
commit dda9012b2a
2 changed files with 14 additions and 0 deletions
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7
drivers/gpu/drm/exynos/exynos_hdmi.c
View File

@ -2163,6 +2163,13 @@ static void hdmi_commit(void *ctx)
DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
mutex_lock(&hdata->hdmi_mutex);
if (!hdata->powered) {
mutex_unlock(&hdata->hdmi_mutex);
return;
}
mutex_unlock(&hdata->hdmi_mutex);
hdmi_conf_apply(hdata);
}

7
drivers/gpu/drm/exynos/exynos_mixer.c
View File

@ -776,6 +776,13 @@ static void mixer_win_commit(void *ctx, int win)
DRM_DEBUG_KMS("[%d] %s, win: %d\n", __LINE__, __func__, win);
mutex_lock(&mixer_ctx->mixer_mutex);
if (!mixer_ctx->powered) {
mutex_unlock(&mixer_ctx->mixer_mutex);
return;
}
mutex_unlock(&mixer_ctx->mixer_mutex);
if (win > 1 && mixer_ctx->vp_enabled)
vp_video_buffer(mixer_ctx, win);
else