Hi Yakir, On Thu, Oct 29, 2015 at 09:58:38AM +0800, Yakir Yang wrote: > Add phy driver for the Rockchip DisplayPort PHY module. This > is required to get DisplayPort working in Rockchip SoCs. > > Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx> > Signed-off-by: Yakir Yang <ykk@xxxxxxxxxxxxxx> > --- ... > diff --git a/drivers/phy/phy-rockchip-dp.c b/drivers/phy/phy-rockchip-dp.c > new file mode 100644 > index 0000000..f3e0058 > --- /dev/null > +++ b/drivers/phy/phy-rockchip-dp.c > @@ -0,0 +1,151 @@ > +/* > + * Rockchip DP PHY driver > + * > + * Copyright (C) 2015 FuZhou Rockchip Co., Ltd. > + * Author: Yakir Yang <ykk@@rock-chips.com> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License. > + */ > + > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/clk.h> > +#include <linux/phy/phy.h> > +#include <linux/regmap.h> > +#include <linux/mfd/syscon.h> > +#include <linux/platform_device.h> > + > +#define GRF_SOC_CON12 0x0274 > + > +#define GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK BIT(4) > +#define GRF_EDP_REF_CLK_SEL_INTER BIT(4) Why are the above two macros the same? Judging by the RK3288 manual and other downstream drivers, it seems like you want the _MASK one to be shifted left by 16 (i.e., BIT(20)). > + > +#define GRF_EDP_PHY_SIDDQ_HIWORD_MASK BIT(21) > +#define GRF_EDP_PHY_SIDDQ_ON 0 > +#define GRF_EDP_PHY_SIDDQ_OFF BIT(5) > + ... > + ret = regmap_write(dp->grf, GRF_SOC_CON12, GRF_EDP_REF_CLK_SEL_INTER | > + GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK); IOW, the above is writing: BIT(4) | BIT(4) whereas I think you want: BIT(4) | BIT(20) > + if (ret != 0) { > + dev_err(dp->dev, "Could not config GRF edp ref clk: %d\n", ret); > + return ret; > + } > + ... (FYI, I came across this by inspection when comparing Heiko's 'somewhat-stable' branch [1] with this series. The former brings up eDP fine on veyron-jaq, whereas this one doesn't yet, even with the above change. Still debugging the issue.) Brian [1] https://github.com/mmind/linux-rockchip/tree/devel/somewhat-stable -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html