Re: [PATCH v7 1/3] drm/bridge/synopsys: dsi: stop clobbering drvdata
Hi Nickey,
On 12/12/2017 02:10 AM, Nickey Yang wrote:
> From: Brian Norris
>
> Bridge drivers/helpers shouldn't be clobbering the drvdata, since a
> parent driver might need to own this. Instead, let's return our
> 'dw_mipi_dsi' object and have callers pass that back to us for removal.
>
> Signed-off-by: Brian Norris
> Signed-off-by: Nickey Yang
> Link:https://patchwork.kernel.org/patch/10078493/
>
> ---
> Changes
>
> v4:
> - Add From tag,update subject line
> - keep patch "drm/stm: dsi: Adjust dw_mipi_dsi_probe and remove"
>in this piece together.
>
> v5:
> - remove Review & Ack tag
> - fix remove() directly referencing the static
>dw_mipi_dsi_stm_plat_data struct.
>
> v7:
> - add missing platform_set_drvdata in stm part.
>
> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 36
> ++-
> drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 12 ++---
> include/drm/bridge/dw_mipi_dsi.h | 17 -
> 3 files changed, 32 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index d9cca4f..c39c7dc 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -922,8 +922,6 @@ static int dw_mipi_dsi_bridge_attach(struct drm_bridge
> *bridge)
> dsi->bridge.of_node = pdev->dev.of_node;
> #endif
>
> - dev_set_drvdata(dev, dsi);
> -
> return dsi;
> }
>
> @@ -935,23 +933,16 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi
> *dsi)
> /*
>* Probe/remove API, used from platforms based on the DRM bridge API.
>*/
> -int dw_mipi_dsi_probe(struct platform_device *pdev,
> - const struct dw_mipi_dsi_plat_data *plat_data)
> +struct dw_mipi_dsi *
> +dw_mipi_dsi_probe(struct platform_device *pdev,
> + const struct dw_mipi_dsi_plat_data *plat_data)
> {
> - struct dw_mipi_dsi *dsi;
> -
> - dsi = __dw_mipi_dsi_probe(pdev, plat_data);
> - if (IS_ERR(dsi))
> - return PTR_ERR(dsi);
> -
> - return 0;
> + return __dw_mipi_dsi_probe(pdev, plat_data);
> }
> EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
>
> -void dw_mipi_dsi_remove(struct platform_device *pdev)
> +void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
> {
> - struct dw_mipi_dsi *dsi = platform_get_drvdata(pdev);
> -
> mipi_dsi_host_unregister(&dsi->dsi_host);
>
> __dw_mipi_dsi_remove(dsi);
> @@ -961,31 +952,30 @@ void dw_mipi_dsi_remove(struct platform_device *pdev)
> /*
>* Bind/unbind API, used from platforms based on the component framework.
>*/
> -int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder
> *encoder,
> - const struct dw_mipi_dsi_plat_data *plat_data)
> +struct dw_mipi_dsi *
> +dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
> + const struct dw_mipi_dsi_plat_data *plat_data)
> {
> struct dw_mipi_dsi *dsi;
> int ret;
>
> dsi = __dw_mipi_dsi_probe(pdev, plat_data);
> if (IS_ERR(dsi))
> - return PTR_ERR(dsi);
> + return dsi;
>
> ret = drm_bridge_attach(encoder, &dsi->bridge, NULL);
> if (ret) {
> - dw_mipi_dsi_remove(pdev);
> + dw_mipi_dsi_remove(dsi);
> DRM_ERROR("Failed to initialize bridge with drm\n");
> - return ret;
> + return ERR_PTR(ret);
> }
>
> - return 0;
> + return dsi;
> }
> EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
>
> -void dw_mipi_dsi_unbind(struct device *dev)
> +void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi)
> {
> - struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
> -
> __dw_mipi_dsi_remove(dsi);
> }
> EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> index e5b6310..c1ed691 100644
> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> @@ -66,6 +66,7 @@ enum dsi_color {
> struct dw_mipi_dsi_stm {
> void __iomem *base;
> struct clk *pllref_clk;
> + struct dw_mipi_dsi *dmd;
> };
>
> static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
> @@ -290,6 +291,8 @@ static int dw_mipi_dsi_stm_probe(struct platform_device
> *pdev)
> if (!dsi)
> return -ENOMEM;
>
> + platform_set_drvdata(pdev, dsi);
> +
Why don't you simply use the original patch from Brian.
With your last update, platform_set_drvdata() is called early during the
stm_probe() and this is not the "classic" way: most of the time we
prefer calling platform_set_drvdata() at the end of the probe (or as
close as possible of the end of the probe). I took few minutes to look
into drm directory and it seems to be the classic way for most of the
drivers...
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
[PATCH v7 1/3] drm/bridge/synopsys: dsi: stop clobbering drvdata
From: Brian Norris
Bridge drivers/helpers shouldn't be clobbering the drvdata, since a
parent driver might need to own this. Instead, let's return our
'dw_mipi_dsi' object and have callers pass that back to us for removal.
Signed-off-by: Brian Norris
Signed-off-by: Nickey Yang
Link:https://patchwork.kernel.org/patch/10078493/
---
Changes
v4:
- Add From tag,update subject line
- keep patch "drm/stm: dsi: Adjust dw_mipi_dsi_probe and remove"
in this piece together.
v5:
- remove Review & Ack tag
- fix remove() directly referencing the static
dw_mipi_dsi_stm_plat_data struct.
v7:
- add missing platform_set_drvdata in stm part.
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 36 ++-
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 12 ++---
include/drm/bridge/dw_mipi_dsi.h | 17 -
3 files changed, 32 insertions(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index d9cca4f..c39c7dc 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -922,8 +922,6 @@ static int dw_mipi_dsi_bridge_attach(struct drm_bridge
*bridge)
dsi->bridge.of_node = pdev->dev.of_node;
#endif
- dev_set_drvdata(dev, dsi);
-
return dsi;
}
@@ -935,23 +933,16 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
/*
* Probe/remove API, used from platforms based on the DRM bridge API.
*/
-int dw_mipi_dsi_probe(struct platform_device *pdev,
- const struct dw_mipi_dsi_plat_data *plat_data)
+struct dw_mipi_dsi *
+dw_mipi_dsi_probe(struct platform_device *pdev,
+ const struct dw_mipi_dsi_plat_data *plat_data)
{
- struct dw_mipi_dsi *dsi;
-
- dsi = __dw_mipi_dsi_probe(pdev, plat_data);
- if (IS_ERR(dsi))
- return PTR_ERR(dsi);
-
- return 0;
+ return __dw_mipi_dsi_probe(pdev, plat_data);
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
-void dw_mipi_dsi_remove(struct platform_device *pdev)
+void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
{
- struct dw_mipi_dsi *dsi = platform_get_drvdata(pdev);
-
mipi_dsi_host_unregister(&dsi->dsi_host);
__dw_mipi_dsi_remove(dsi);
@@ -961,31 +952,30 @@ void dw_mipi_dsi_remove(struct platform_device *pdev)
/*
* Bind/unbind API, used from platforms based on the component framework.
*/
-int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
-const struct dw_mipi_dsi_plat_data *plat_data)
+struct dw_mipi_dsi *
+dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
+const struct dw_mipi_dsi_plat_data *plat_data)
{
struct dw_mipi_dsi *dsi;
int ret;
dsi = __dw_mipi_dsi_probe(pdev, plat_data);
if (IS_ERR(dsi))
- return PTR_ERR(dsi);
+ return dsi;
ret = drm_bridge_attach(encoder, &dsi->bridge, NULL);
if (ret) {
- dw_mipi_dsi_remove(pdev);
+ dw_mipi_dsi_remove(dsi);
DRM_ERROR("Failed to initialize bridge with drm\n");
- return ret;
+ return ERR_PTR(ret);
}
- return 0;
+ return dsi;
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
-void dw_mipi_dsi_unbind(struct device *dev)
+void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi)
{
- struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
-
__dw_mipi_dsi_remove(dsi);
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index e5b6310..c1ed691 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -66,6 +66,7 @@ enum dsi_color {
struct dw_mipi_dsi_stm {
void __iomem *base;
struct clk *pllref_clk;
+ struct dw_mipi_dsi *dmd;
};
static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
@@ -290,6 +291,8 @@ static int dw_mipi_dsi_stm_probe(struct platform_device
*pdev)
if (!dsi)
return -ENOMEM;
+ platform_set_drvdata(pdev, dsi);
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
DRM_ERROR("Unable to get resource\n");
@@ -318,10 +321,11 @@ static int dw_mipi_dsi_stm_probe(struct platform_device
*pdev)
dw_mipi_dsi_stm_plat_data.base = dsi->base;
dw_mipi_dsi_stm_plat_data.priv_data = dsi;
- ret = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
- if (ret) {
+ dsi->dmd = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
+ if (IS_ERR(dsi->dmd)) {
DRM_ERROR("Failed to initialize mipi dsi host\n");
clk_disable_unprepare(dsi->pllref_clk);
+ return PTR_ERR(dsi->dmd);
}
return ret;
@@ -329,10 +333,10 @@ static int dw_mipi_dsi_stm_probe(struct
