linux-kernel - [PATCH 3/3] vcodec: mediatek: Add probe-defer for MTK IOMMU and SMI

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Date:	Wed, 20 Jul 2016 11:02:01 +0800
From:	Yong Wu <yong.wu@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Hans Verkuil <hans.verkuil@...co.com>
CC:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Tiffany Lin <tiffany.lin@...iatek.com>,
	Honghui Zhang <honghui.zhang@...iatek.com>,
	Bibby Hsieh <bibby.hsieh@...iatek.com>,
	YT Shen <yt.shen@...iatek.com>, CK Hu <ck.hu@...iatek.com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	<youlin.pei@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
	<srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux-foundation.org>, Yong Wu <yong.wu@...iatek.com>
Subject: [PATCH 3/3] vcodec: mediatek: Add probe-defer for MTK IOMMU and SMI

Mediatek V4l2 depend on the IOMMU and SMI. we should add probe-defer
to wait for the IOMMU and SMI is ready.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
index 4c977b2..9e6203e 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
@@ -66,6 +66,11 @@ int mtk_vcodec_init_enc_pm(struct mtk_vcodec_dev *mtkdev)
 	pdev = mtkdev->plat_dev;
 	pm->dev = &pdev->dev;
 
+	/* Wait until MTK IOMMU and SMI probe done.*/
+	if (!mtk_smi_larb_is_ready(pm->larbvenc) ||
+	    !mtk_smi_larb_is_ready(pm->larbvenclt))
+		return -EPROBE_DEFER;
+
 	pm->vencpll_d2 = devm_clk_get(&pdev->dev, "venc_sel_src");
 	if (IS_ERR(pm->vencpll_d2)) {
 		mtk_v4l2_err("devm_clk_get vencpll_d2 fail");
-- 
1.8.1.1.dirty