The component master driver imx-drm-core matches component devices using their of_node. Since commit 950b410dd1ab ("gpu: ipu-v3: Fix imx-ipuv3-crtc module autoloading"), the imx-ipuv3-crtc dev->of_node is not set during probing. Before that, of_node was set and caused an of: modalias to be used instead of the platform: modalias, which broke module autoloading.

On the other hand, if dev->of_node is not set yet when the imx-ipuv3-crtc probe function calls component_add, component matching in imx-drm-core fails. While dev->of_node will be set once the next component tries to bring up the component master, imx-drm-core component binding will never succeed if one of the crtc devices is probed last.

This patch adds an of_node pointer to the component platform data and matches against the pdata->of_node instead of dev->of_node in imx-drm-core to work around this problem.

Fixes: 950b410dd1ab ("gpu: ipu-v3: Fix imx-ipuv3-crtc module autoloading") Signed-off-by: Philipp Zabel p.zabel@pengutronix.de --- I don't like this workaround on top of a workaround, and I think commit 950b410dd1ab should eventually be reverted in favor of another patch that allows the core code to fall back to a platform: modalias if the pdev->dev.of_node doesn't have a compatible property set.

As an alternative to applying this patch I would see reverting commit 407c9eba7897 ("drm/imx: Remove of_node assignment from ipuv3-crtc driver probe") for now, even though I think it is correct. --- drivers/gpu/drm/imx/imx-drm-core.c | 8 ++++++++ drivers/gpu/ipu-v3/ipu-common.c | 5 +++-- include/video/imx-ipu-v3.h | 2 ++ 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c index e26dcde..05229b9 100644 --- a/drivers/gpu/drm/imx/imx-drm-core.c +++ b/drivers/gpu/drm/imx/imx-drm-core.c @@ -25,6 +25,7 @@ #include <drm/drm_fb_cma_helper.h> #include <drm/drm_plane_helper.h> #include <drm/drm_of.h> +#include <video/imx-ipu-v3.h>

#include "imx-drm.h"

@@ -444,6 +445,13 @@ static int compare_of(struct device *dev, void *data) { struct device_node *np = data;

+ /* Special case for DI, dev->of_node may not be set yet */ + if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) { + struct ipu_client_platformdata *pdata = dev->platform_data; + + return pdata->of_node == np; + } + /* Special case for LDB, one device for two channels */ if (of_node_cmp(np->name, "lvds-channel") == 0) { np = of_get_parent(np); diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c index abb98c7..99dcacf 100644 --- a/drivers/gpu/ipu-v3/ipu-common.c +++ b/drivers/gpu/ipu-v3/ipu-common.c @@ -997,7 +997,7 @@ struct ipu_platform_reg { };

/* These must be in the order of the corresponding device tree port nodes */ -static const struct ipu_platform_reg client_reg[] = { +static struct ipu_platform_reg client_reg[] = { { .pdata = { .csi = 0, @@ -1048,7 +1048,7 @@ static int ipu_add_client_devices(struct ipu_soc *ipu, unsigned long ipu_base) mutex_unlock(&ipu_client_id_mutex);

for (i = 0; i < ARRAY_SIZE(client_reg); i++) { - const struct ipu_platform_reg *reg = &client_reg[i]; + struct ipu_platform_reg *reg = &client_reg[i]; struct platform_device *pdev; struct device_node *of_node;

@@ -1070,6 +1070,7 @@ static int ipu_add_client_devices(struct ipu_soc *ipu, unsigned long ipu_base)

pdev->dev.parent = dev;

+ reg->pdata.of_node = of_node; ret = platform_device_add_data(pdev, &reg->pdata, sizeof(reg->pdata)); if (!ret) diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h index ad66589..3a2a794 100644 --- a/include/video/imx-ipu-v3.h +++ b/include/video/imx-ipu-v3.h @@ -16,6 +16,7 @@ #include <linux/videodev2.h> #include <linux/bitmap.h> #include <linux/fb.h> +#include <linux/of.h> #include <media/v4l2-mediabus.h> #include <video/videomode.h>

@@ -345,6 +346,7 @@ struct ipu_client_platformdata { int dc; int dp; int dma[2]; + struct device_node *of_node; };

#endif /* __DRM_IPU_H__ */