| Message ID | 20211012064843.298104-5-alexander.stein@ew.tq-group.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ti-sn65dsi83 patches | expand |
Hi Alexander, Thank you for the patch. On Tue, Oct 12, 2021 at 08:48:43AM +0200, Alexander Stein wrote: > VCC needs to be enabled before releasing the enable GPIO. > > Reviewed-by: Sam Ravnborg <sam@ravnborg.org> > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> > --- > drivers/gpu/drm/bridge/ti-sn65dsi83.c | 15 ++++++++++++++- > 1 file changed, 14 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c > index 9072342566f3..a6b1fd71dfee 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c > @@ -33,6 +33,7 @@ > #include <linux/of_device.h> > #include <linux/of_graph.h> > #include <linux/regmap.h> > +#include <linux/regulator/consumer.h> > > #include <drm/drm_atomic_helper.h> > #include <drm/drm_bridge.h> > @@ -143,6 +144,7 @@ struct sn65dsi83 { > struct mipi_dsi_device *dsi; > struct drm_bridge *panel_bridge; > struct gpio_desc *enable_gpio; > + struct regulator *vcc; > int dsi_lanes; > bool lvds_dual_link; > bool lvds_dual_link_even_odd_swap; > @@ -647,6 +649,12 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model) > > ctx->panel_bridge = panel_bridge; > > + ctx->vcc = devm_regulator_get(dev, "vcc"); > + if (IS_ERR(ctx->vcc)) > + return dev_err_probe(dev, PTR_ERR(ctx->vcc), > + "Failed to get supply 'vcc': %pe\n", > + ctx->vcc); > + > return 0; > } > > @@ -691,7 +699,11 @@ static int sn65dsi83_probe(struct i2c_client *client, > ctx->bridge.of_node = dev->of_node; > drm_bridge_add(&ctx->bridge); > > - return 0; > + ret = regulator_enable(ctx->vcc); > + if (ret) > + dev_err(dev, "Failed to enable vcc: %i\n", ret); I think this should move to sn65dsi83_atomic_pre_enable() (and similarly for regulator_disable()) as keeping the regulator enabled at all times will cost power. > + > + return ret; > } > > static int sn65dsi83_remove(struct i2c_client *client) > @@ -702,6 +714,7 @@ static int sn65dsi83_remove(struct i2c_client *client) > mipi_dsi_device_unregister(ctx->dsi); > drm_bridge_remove(&ctx->bridge); > of_node_put(ctx->host_node); > + regulator_disable(ctx->vcc); > > return 0; > }
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c index 9072342566f3..a6b1fd71dfee 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c @@ -33,6 +33,7 @@ #include <linux/of_device.h> #include <linux/of_graph.h> #include <linux/regmap.h> +#include <linux/regulator/consumer.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> @@ -143,6 +144,7 @@ struct sn65dsi83 { struct mipi_dsi_device *dsi; struct drm_bridge *panel_bridge; struct gpio_desc *enable_gpio; + struct regulator *vcc; int dsi_lanes; bool lvds_dual_link; bool lvds_dual_link_even_odd_swap; @@ -647,6 +649,12 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model) ctx->panel_bridge = panel_bridge; + ctx->vcc = devm_regulator_get(dev, "vcc"); + if (IS_ERR(ctx->vcc)) + return dev_err_probe(dev, PTR_ERR(ctx->vcc), + "Failed to get supply 'vcc': %pe\n", + ctx->vcc); + return 0; } @@ -691,7 +699,11 @@ static int sn65dsi83_probe(struct i2c_client *client, ctx->bridge.of_node = dev->of_node; drm_bridge_add(&ctx->bridge); - return 0; + ret = regulator_enable(ctx->vcc); + if (ret) + dev_err(dev, "Failed to enable vcc: %i\n", ret); + + return ret; } static int sn65dsi83_remove(struct i2c_client *client) @@ -702,6 +714,7 @@ static int sn65dsi83_remove(struct i2c_client *client) mipi_dsi_device_unregister(ctx->dsi); drm_bridge_remove(&ctx->bridge); of_node_put(ctx->host_node); + regulator_disable(ctx->vcc); return 0; }