From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: Re: [PATCH 15/21] drm: sun4i: add support for HVCC regulator for DWC HDMI glue Date: Wed, 2 May 2018 13:48:43 +0200 Message-ID: <20180502114843.ou4qczp5eaigrdfo@flea> References: <20180430114058.5061-1-jagan@amarulasolutions.com> <20180430114058.5061-16-jagan@amarulasolutions.com> Reply-To: maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="2qato2boi6jl56g2" Return-path: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Content-Disposition: inline In-Reply-To: <20180430114058.5061-16-jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Jagan Teki Cc: Chen-Yu Tsai , Icenowy Zheng , Jernej Skrabec , Rob Herring , Mark Rutland , Catalin Marinas , Will Deacon , David Airlie , dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, Michael Turquette , Stephen Boyd , linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Michael Trimarchi , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Id: devicetree@vger.kernel.org --2qato2boi6jl56g2 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline On Mon, Apr 30, 2018 at 05:10:52PM +0530, Jagan Teki wrote: > From: Icenowy Zheng > > Allwinner SoCs with DWC HDMI controller have a "HVCC" power pin for the > HDMI part, and on some boards it's connected to a dedicated regulator > rather than the main 3.3v. > > Add support for optional HVCC regulator. For boards that doesn't use a > dedicated regulator to power it, the default dummy regulator is used. > > Signed-off-by: Icenowy Zheng > Signed-off-by: Jagan Teki > --- > drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 14 ++++++++++++++ > drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | 2 ++ > 2 files changed, 16 insertions(+) > > diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c > index 9f40a44b456b..7c33faff7ad4 100644 > --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c > +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c > @@ -73,6 +73,12 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master, > if (encoder->possible_crtcs == 0) > return -EPROBE_DEFER; > > + hdmi->vcc_hdmi = devm_regulator_get(dev, "hvcc"); > + if (IS_ERR(hdmi->vcc_hdmi)) { > + dev_err(dev, "Could not get HDMI power supply\n"); > + return PTR_ERR(hdmi->vcc_hdmi); > + } > + You're not making it optional here, unlike what your commit log says. Not that I'm fine with both, but we need to be consistent :) > hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl"); > if (IS_ERR(hdmi->rst_ctrl)) { > dev_err(dev, "Could not get ctrl reset control\n"); > @@ -91,6 +97,12 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master, > return ret; > } > > + ret = regulator_enable(hdmi->vcc_hdmi); > + if (ret) { > + dev_err(dev, "Cannot enable HDMI power supply\n"); > + goto err_disable_vcc; > + } > + > ret = clk_prepare_enable(hdmi->clk_tmds); > if (ret) { > dev_err(dev, "Could not enable tmds clock\n"); > @@ -143,6 +155,8 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master, > clk_disable_unprepare(hdmi->clk_tmds); > err_assert_ctrl_reset: > reset_control_assert(hdmi->rst_ctrl); > +err_disable_vcc: > + regulator_disable(hdmi->vcc_hdmi); The err_disable_vcc label will disable the regulator, but if there's an error in regulator_enable, it will disable it while it wasn't enabled in the first place, which is not really something we want to do. Maxime -- Maxime Ripard, Bootlin (formerly Free Electrons) Embedded Linux and Kernel engineering https://bootlin.com --2qato2boi6jl56g2--