[PATCH v2] drm/exynos: clear channels only when iommu is enabled

From: Joonyoung Shim <jy0922.shim@samsung.com>
To: dri-devel@lists.freedesktop.org
Cc: k.kozlowski@samsung.com, sw0312.kim@samsung.com,
	m.szyprowski@samsung.com
Subject: [PATCH v2] drm/exynos: clear channels only when iommu is enabled
Date: Tue, 28 Jul 2015 17:51:02 +0900	[thread overview]
Message-ID: <1438073462-32560-1-git-send-email-jy0922.shim@samsung.com> (raw)

This is simplest solution about reported problem[1]. It's no problem to
clear channel only when iommu is enabled, if we consider that we cannot
recognize iommu errors when iommu is disabled and it have been valid
until now. But this cannot be nice solution.

[1] https://lkml.org/lkml/2015/7/21/404

Reported-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
---
v2: add Reported-by.

 drivers/gpu/drm/exynos/exynos_drm_fimd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 8d362b9..337af02 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -956,7 +956,8 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
 	if (ctx->display)
 		exynos_drm_create_enc_conn(drm_dev, ctx->display);
 
-	fimd_clear_channels(ctx->crtc);
+	if (is_drm_iommu_supported(drm_dev))
+		fimd_clear_channels(ctx->crtc);
 
 	ret = drm_iommu_attach_device(drm_dev, dev);
 	if (ret)
-- 
1.9.1

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