From: Yong Wu <yong.wu@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Rob Herring <robh+dt@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>,
Tomasz Figa <tfiga@google.com>, Will Deacon <will.deacon@arm.com>,
<linux-mediatek@lists.infradead.org>,
<srv_heupstream@mediatek.com>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<iommu@lists.linux-foundation.org>, <arnd@arndb.de>,
<yingjoe.chen@mediatek.com>, <yong.wu@mediatek.com>,
<youlin.pei@mediatek.com>,
Nicolas Boichat <drinkcat@chromium.org>
Subject: [PATCH 03/13] iommu/mediatek: Add probe_defer for smi-larb
Date: Tue, 1 Jan 2019 12:51:06 +0800 [thread overview]
Message-ID: <1546318276-18993-4-git-send-email-yong.wu@mediatek.com> (raw)
In-Reply-To: <1546318276-18993-1-git-send-email-yong.wu@mediatek.com>
The iommu consumer should use device_link to connect with the
smi-larb(supplier). then the smi-larb should run before the iommu
consumer. Here we delay the iommu driver until the smi driver is
ready, then all the iommu consumer always is after the smi driver.
When there is no this patch, if some consumer drivers run before
smi-larb, the supplier link_status is DL_DEV_NO_DRIVER(0) in the
device_link_add, then device_links_driver_bound will use WARN_ON
to complain that the link_status of supplier is not right.
This is a preparing patch for adding device_link.
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
drivers/iommu/mtk_iommu.c | 2 +-
drivers/iommu/mtk_iommu_v1.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 36526c9..202e41b 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -645,7 +645,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
id = i;
plarbdev = of_find_device_by_node(larbnode);
- if (!plarbdev)
+ if (!plarbdev || !plarbdev->dev.driver)
return -EPROBE_DEFER;
data->smi_imu.larb_imu[id].dev = &plarbdev->dev;
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index f8b8275..9386aee 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -601,7 +601,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
plarbdev = of_platform_device_create(
larb_spec.np, NULL,
platform_bus_type.dev_root);
- if (!plarbdev) {
+ if (!plarbdev || !plarbdev->dev.driver) {
of_node_put(larb_spec.np);
return -EPROBE_DEFER;
}
--
1.9.1
next prev parent reply other threads:[~2019-01-01 4:52 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-01 4:51 [PATCH 00/13] Clean up "mediatek,larb" after adding device_link Yong Wu
2019-01-01 4:51 ` [PATCH 01/13] dt-binding: mediatek: Get rid of mediatek,larb for multimedia HW Yong Wu
2019-01-11 14:58 ` Rob Herring
2019-02-25 23:54 ` Evan Green
2019-01-01 4:51 ` [PATCH 02/13] driver core: Remove the link if there is no driver with AUTO flag Yong Wu
2019-02-25 23:53 ` Evan Green
2019-02-27 14:33 ` Yong Wu
2019-03-05 19:03 ` Evan Green
2019-03-12 14:21 ` Matthias Brugger
2019-03-12 23:17 ` Evan Green
2019-03-13 9:08 ` Yong Wu
2019-01-01 4:51 ` Yong Wu [this message]
2019-02-25 23:54 ` [PATCH 03/13] iommu/mediatek: Add probe_defer for smi-larb Evan Green
2019-02-27 14:33 ` Yong Wu
2019-03-05 19:02 ` Evan Green
2019-01-01 4:51 ` [PATCH 04/13] iommu/mediatek: Add device_link between the consumer and the larb devices Yong Wu
2019-02-25 23:54 ` Evan Green
2019-02-27 14:34 ` Yong Wu
2019-02-27 19:30 ` Robin Murphy
2019-03-13 9:11 ` Yong Wu
2019-01-01 4:51 ` [PATCH 05/13] memory: mtk-smi: Add device-link between smi-larb and smi-common Yong Wu
2019-02-25 23:54 ` Evan Green
2019-02-27 14:33 ` Yong Wu
2019-03-05 19:02 ` Evan Green
2019-01-01 4:51 ` [PATCH 06/13] media: mtk-jpeg: Get rid of mtk_smi_larb_get/put Yong Wu
2019-02-25 23:55 ` Evan Green
2019-01-01 4:51 ` [PATCH 07/13] media: mtk-mdp: " Yong Wu
2019-02-25 23:55 ` Evan Green
2019-01-01 4:51 ` [PATCH 08/13] media: mtk-vcodec: " Yong Wu
2019-02-25 23:55 ` Evan Green
2019-01-01 4:51 ` [PATCH 09/13] drm/mediatek: " Yong Wu
2019-02-25 23:55 ` Evan Green
2019-01-01 4:51 ` [PATCH 10/13] memory: mtk-smi: " Yong Wu
2019-02-25 23:56 ` Evan Green
2019-01-01 4:51 ` [PATCH 11/13] iommu/mediatek: Use builtin_platform_driver Yong Wu
2019-02-25 23:56 ` Evan Green
2019-02-27 14:33 ` Yong Wu
2019-03-05 19:03 ` Evan Green
2019-01-01 4:51 ` [PATCH 12/13] arm: dts: mediatek: Get rid of mediatek,larb for MM nodes Yong Wu
2019-02-25 23:56 ` Evan Green
2019-01-01 4:51 ` [PATCH 13/13] arm64: " Yong Wu
2019-02-25 23:56 ` Evan Green
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