Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933184AbdCUUQy (ORCPT ); Tue, 21 Mar 2017 16:16:54 -0400 Received: from mail-qk0-f173.google.com ([209.85.220.173]:33295 "EHLO mail-qk0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933017AbdCUUQw (ORCPT ); Tue, 21 Mar 2017 16:16:52 -0400 Date: Tue, 21 Mar 2017 16:16:23 -0400 From: Sean Paul To: Chris Zhong Cc: linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, robh+dt@kernel.org Subject: Re: [PATCH v3 1/4] drm/rockchip/dsi: check phy_cfg_clk only for RK3399 Message-ID: <20170321201623.GF19389@art_vandelay> References: <1489722865-22122-1-git-send-email-zyw@rock-chips.com> <1489722865-22122-2-git-send-email-zyw@rock-chips.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1489722865-22122-2-git-send-email-zyw@rock-chips.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2519 Lines: 81 On Fri, Mar 17, 2017 at 11:54:21AM +0800, Chris Zhong wrote: > For RK3399, the phy_cfg_clk is a required clock, if phy_cfg_clk is > disabled, MIPI phy can not work. Let's return a error if there is no > phy_cfg_clk in dts property, when the pdata match RK3399. > The dt bindings say this is a required clock, I think you'll need to update them to reflect that this is optional for certain SoCs Sean > Signed-off-by: Chris Zhong > --- > > Changes in v3: > - add a DW_MIPI_NEEDS_PHY_CFG_CLK for RK3399 > > Changes in v2: None > > drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 14 ++++++++------ > 1 file changed, 8 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c > index f84f9ae..68f48b0 100644 > --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c > +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c > @@ -251,6 +251,8 @@ > #define THS_PRE_PROGRAM_EN BIT(7) > #define THS_ZERO_PROGRAM_EN BIT(6) > > +#define DW_MIPI_NEEDS_PHY_CFG_CLK BIT(0) > + > enum { > BANDGAP_97_07, > BANDGAP_98_05, > @@ -279,6 +281,7 @@ struct dw_mipi_dsi_plat_data { > u32 grf_switch_reg; > u32 grf_dsi0_mode; > u32 grf_dsi0_mode_reg; > + unsigned int flags; > unsigned int max_data_lanes; > }; > > @@ -1136,6 +1139,7 @@ static struct dw_mipi_dsi_plat_data rk3399_mipi_dsi_drv_data = { > .grf_switch_reg = RK3399_GRF_SOC_CON19, > .grf_dsi0_mode = RK3399_GRF_DSI_MODE, > .grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22, > + .flags = DW_MIPI_NEEDS_PHY_CFG_CLK, > .max_data_lanes = 4, > }; > > @@ -1227,15 +1231,13 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master, > clk_disable_unprepare(dsi->pclk); > } > > - dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg"); > - if (IS_ERR(dsi->phy_cfg_clk)) { > - ret = PTR_ERR(dsi->phy_cfg_clk); > - if (ret != -ENOENT) { > + if (pdata->flags & DW_MIPI_NEEDS_PHY_CFG_CLK) { > + dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg"); > + if (IS_ERR(dsi->phy_cfg_clk)) { > + ret = PTR_ERR(dsi->phy_cfg_clk); > dev_err(dev, "Unable to get phy_cfg_clk: %d\n", ret); > return ret; > } > - dsi->phy_cfg_clk = NULL; > - dev_dbg(dev, "have not phy_cfg_clk\n"); > } > > ret = clk_prepare_enable(dsi->pllref_clk); > -- > 2.6.3 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Sean Paul, Software Engineer, Google / Chromium OS