Re: [PATCH] drm/bridge/synopsis: stop clobbering drvdata

Laurent Pinchart
2018-01-09T13:37:04Z

Hi Philippe,

On Tuesday, 9 January 2018 15:01:02 EET Philippe CORNU wrote:
> Hi Archit, Andrzej & Laurent,
>
> Regarding this patch from Brian, I think it could be nice to merge it
> (1xAcked-by, 2xReviewed-by).
>
> Could you please have a look?
>
> Only the small "typo" in the headline needs to be changed.
>
> Many thanks,

I've just replied to Brian in this mail thread. Sorry for the delay, it
slipped through the cracks. Thank you for pinging me.

> On 11/28/2017 10:34 AM, Philippe CORNU wrote:
>
> > Hi Brian,
> >
> > On 11/28/2017 02:05 AM, Brian Norris wrote:
> >
> >> 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.
> >
> >
> > And many thanks for this cleanup.
> > (please update the headline with "synopsys")
> >
> > Successfully tested on stm.
> >
> > Acked-by: Philippe Cornu <philippe.cornu@st.com>
> >
> > Many thanks,
> > Philippe :-)
> >
> >>
> >>
> >> Signed-off-by: Brian Norris <briannorris@chromium.org>
> >> ---
> >> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 36
> >> ++++++++++-----------------
> >> drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 14 +++++++----
> >> include/drm/bridge/dw_mipi_dsi.h | 17 ++++++++-----
> >> 3 files changed, 33 insertions(+), 34 deletions(-)
> >>
> >>
> >>
> >> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> >> b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> >> index d9cca4fd66ec..c39c7dce20ed 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 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
> >> 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 @@ EXPORT_SYMBOL_GPL(dw_mipi_dsi_remove);
> >> /*
> >> * 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 e5b6310240fe..7ed0ef7f6ec2 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 *dsi;
> >> };
> >> static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg,
> >> u32 val)
> >> @@ -318,21 +319,24 @@ 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) {
> >> + platform_set_drvdata(pdev, dsi);
> >> +
> >> + dsi->dsi = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
> >> + if (IS_ERR(dsi->dsi)) {
> >> DRM_ERROR("Failed to initialize mipi dsi host\n");
> >> clk_disable_unprepare(dsi->pllref_clk);
> >> + return PTR_ERR(dsi->dsi);
> >> }
> >> - return ret;
> >> + return 0;
> >> }
> >> static int dw_mipi_dsi_stm_remove(struct platform_device *pdev)
> >> {
> >> - struct dw_mipi_dsi_stm *dsi = dw_mipi_dsi_stm_plat_data.priv_data;
> >> + struct dw_mipi_dsi_stm *dsi = platform_get_drvdata(pdev);
> >> clk_disable_unprepare(dsi->pllref_clk);
> >> - dw_mipi_dsi_remove(pdev);
> >> + dw_mipi_dsi_remove(dsi->dsi);
> >> return 0;
> >> }
> >> diff --git a/include/drm/bridge/dw_mipi_dsi.h
> >> b/include/drm/bridge/dw_mipi_dsi.h
> >> index 9b30fec302c8..d9c6d549f971 100644
> >> --- a/include/drm/bridge/dw_mipi_dsi.h
> >> +++ b/include/drm/bridge/dw_mipi_dsi.h
> >> @@ -10,6 +10,8 @@
> >> #ifndef __DW_MIPI_DSI__
> >> #define __DW_MIPI_DSI__
> >> +struct dw_mipi_dsi;
> >> +
> >> struct dw_mipi_dsi_phy_ops {
> >> int (*init)(void *priv_data);
> >> int (*get_lane_mbps)(void *priv_data, struct drm_display_mode
> >> *mode,
> >> @@ -29,11 +31,14 @@ struct dw_mipi_dsi_plat_data {
> >> void *priv_data;
> >> };
> >> -int dw_mipi_dsi_probe(struct platform_device *pdev,
> >> - const struct dw_mipi_dsi_plat_data *plat_data);
> >> -void dw_mipi_dsi_remove(struct platform_device *pdev);
> >> -int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder
> >> *encoder,
> >> - const struct dw_mipi_dsi_plat_data *plat_data);
> >> -void dw_mipi_dsi_unbind(struct device *dev);
> >> +struct dw_mipi_dsi *dw_mipi_dsi_probe(struct platform_device *pdev,
> >> + const struct dw_mipi_dsi_plat_data
> >> + *plat_data);
> >> +void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi);
> >> +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);
> >> +void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi);
> >> #endif /* __DW_MIPI_DSI__ */

--
Regards,

Laurent Pinchart