| Message ID | 20181026144344.27778-17-jagan@amarulasolutions.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/sun4i: Allwinner A64 MIPI-DSI support | expand |
On Mon, Oct 29, 2018 at 3:01 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote: > > On Fri, Oct 26, 2018 at 08:13:35PM +0530, Jagan Teki wrote: > > Some boards have VCC-DSI pin connected to voltage regulator which may > > not be turned on by default. > > > > Add support for such boards by adding voltage regulator handling code to > > MIPI DSI driver. > > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > > Tested-by: Jagan Teki <jagan@amarulasolutions.com> > > --- > > Changes for v3: > > - new patch > > Changes for v2: > > - none > > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 14 ++++++++++++++ > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 3 +++ > > 2 files changed, 17 insertions(+) > > > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > > index 42bd7506abaf..bc57343592e0 100644 > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > > @@ -949,6 +949,12 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master, > > > > dsi->drv = drv; > > > > + ret = regulator_enable(dsi->regulator); > > + if (ret) { > > + dev_err(dev, "Failed to enable regulator\n"); > > + return ret; > > + } > > + > > The regulator should be enabled only when the device is in use. True, but there is no device specific quirk needed because who ever not needed simply use dummy regulator [ 0.245821] sun6i-mipi-dsi 1ca0000.dsi: 1ca0000.dsi supply vcc-dsi not found, using dummy regulato r even like HVCC in hdmi driver [1] [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c?id=633ba1e086e1abbeef1ffd899911de8cf3987d9f
On Mon, Oct 29, 2018 at 08:18:05PM +0530, Jagan Teki wrote: > On Mon, Oct 29, 2018 at 3:01 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote: > > > > On Fri, Oct 26, 2018 at 08:13:35PM +0530, Jagan Teki wrote: > > > Some boards have VCC-DSI pin connected to voltage regulator which may > > > not be turned on by default. > > > > > > Add support for such boards by adding voltage regulator handling code to > > > MIPI DSI driver. > > > > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > > > Tested-by: Jagan Teki <jagan@amarulasolutions.com> > > > --- > > > Changes for v3: > > > - new patch > > > Changes for v2: > > > - none > > > > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 14 ++++++++++++++ > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 3 +++ > > > 2 files changed, 17 insertions(+) > > > > > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > > > index 42bd7506abaf..bc57343592e0 100644 > > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > > > @@ -949,6 +949,12 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master, > > > > > > dsi->drv = drv; > > > > > > + ret = regulator_enable(dsi->regulator); > > > + if (ret) { > > > + dev_err(dev, "Failed to enable regulator\n"); > > > + return ret; > > > + } > > > + > > > > The regulator should be enabled only when the device is in use. > > True, but there is no device specific quirk needed because who ever > not needed simply use dummy regulator > [ 0.245821] sun6i-mipi-dsi 1ca0000.dsi: 1ca0000.dsi supply vcc-dsi > not found, using dummy regulato > r > > even like HVCC in hdmi driver [1] > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c?id=633ba1e086e1abbeef1ffd899911de8cf3987d9f That's not my point. You should enable the regulator only when the DSI bridge is being enabled, not when the driver has probed. Maxime
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 42bd7506abaf..bc57343592e0 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -949,6 +949,12 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master, dsi->drv = drv; + ret = regulator_enable(dsi->regulator); + if (ret) { + dev_err(dev, "Failed to enable regulator\n"); + return ret; + } + drm_encoder_helper_add(&dsi->encoder, &sun6i_dsi_enc_helper_funcs); ret = drm_encoder_init(drm, @@ -980,6 +986,7 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master, err_cleanup_connector: drm_encoder_cleanup(&dsi->encoder); + regulator_disable(dsi->regulator); return ret; } @@ -989,6 +996,7 @@ static void sun6i_dsi_unbind(struct device *dev, struct device *master, struct sun6i_dsi *dsi = dev_get_drvdata(dev); drm_panel_detach(dsi->panel); + regulator_disable(dsi->regulator); } static const struct component_ops sun6i_dsi_ops = { @@ -1022,6 +1030,12 @@ static int sun6i_dsi_probe(struct platform_device *pdev) return PTR_ERR(base); } + dsi->regulator = devm_regulator_get(dev, "vcc-dsi"); + if (IS_ERR(dsi->regulator)) { + dev_err(dev, "Couldn't get regulator\n"); + return PTR_ERR(dsi->regulator); + } + dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base, &sun6i_dsi_regmap_config); if (IS_ERR(dsi->regs)) { diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h index 597b62227019..0df60f84bab3 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h @@ -13,6 +13,8 @@ #include <drm/drm_encoder.h> #include <drm/drm_mipi_dsi.h> +#include <linux/regulator/consumer.h> + struct sun6i_dphy { struct clk *bus_clk; struct clk *mod_clk; @@ -32,6 +34,7 @@ struct sun6i_dsi { struct clk *bus_clk; struct clk *mod_clk; struct regmap *regs; + struct regulator *regulator; struct reset_control *reset; struct sun6i_dphy *dphy;