On Wed, Oct 23, 2019 at 06:56:17PM +0200, Stephan Gerhold wrote: > The DSI PHY regulator supports two regulator modes: LDO and DCDC. > This mode can be selected using the "qcom,dsi-phy-regulator-ldo-mode" > device tree property. > > However, at the moment only the 20nm PHY driver actually implements > that option. Add a check in the 28nm PHY driver to program the > registers correctly for LDO mode. > > Tested-by: Nikita Travkin <nikitos.tr@xxxxxxxxx> # l8150 > Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx> Thanks for your patch! I've pushed it to msm-next. Sean > --- > Changes in v2: Move DCDC/LDO code into separate methods > v1: https://lore.kernel.org/linux-arm-msm/20191021163425.83697-1-stephan@xxxxxxxxxxx/ > > This is needed to make the display work on Longcheer L8150, > which has recently gained mainline support in: > https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?id=16e8e8072108426029f0c16dff7fbe77fae3df8f > > This patch is based on code from the downstream kernel: > https://source.codeaurora.org/quic/la/kernel/msm-3.10/tree/drivers/video/msm/mdss/msm_mdss_io_8974.c?h=LA.BR.1.2.9.1-02310-8x16.0#n152 > > The LDO regulator configuration is taken from msm8916-qrd.dtsi: > https://source.codeaurora.org/quic/la/kernel/msm-3.10/tree/arch/arm/boot/dts/qcom/msm8916-qrd.dtsi?h=LA.BR.1.2.9.1-02310-8x16.0#n56 > --- > drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c | 42 +++++++++++++++++----- > 1 file changed, 34 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c > index b3f678f6c2aa..b384ea20f359 100644 > --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c > +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c > @@ -39,15 +39,10 @@ static void dsi_28nm_dphy_set_timing(struct msm_dsi_phy *phy, > DSI_28nm_PHY_TIMING_CTRL_11_TRIG3_CMD(0)); > } > > -static void dsi_28nm_phy_regulator_ctrl(struct msm_dsi_phy *phy, bool enable) > +static void dsi_28nm_phy_regulator_enable_dcdc(struct msm_dsi_phy *phy) > { > void __iomem *base = phy->reg_base; > > - if (!enable) { > - dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CAL_PWR_CFG, 0); > - return; > - } > - > dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_0, 0x0); > dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CAL_PWR_CFG, 1); > dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_5, 0); > @@ -56,6 +51,39 @@ static void dsi_28nm_phy_regulator_ctrl(struct msm_dsi_phy *phy, bool enable) > dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_1, 0x9); > dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_0, 0x7); > dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_4, 0x20); > + dsi_phy_write(phy->base + REG_DSI_28nm_PHY_LDO_CNTRL, 0x00); > +} > + > +static void dsi_28nm_phy_regulator_enable_ldo(struct msm_dsi_phy *phy) > +{ > + void __iomem *base = phy->reg_base; > + > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_0, 0x0); > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CAL_PWR_CFG, 0); > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_5, 0x7); > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_3, 0); > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_2, 0x1); > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_1, 0x1); > + dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_4, 0x20); > + > + if (phy->cfg->type == MSM_DSI_PHY_28NM_LP) > + dsi_phy_write(phy->base + REG_DSI_28nm_PHY_LDO_CNTRL, 0x05); > + else > + dsi_phy_write(phy->base + REG_DSI_28nm_PHY_LDO_CNTRL, 0x0d); > +} > + > +static void dsi_28nm_phy_regulator_ctrl(struct msm_dsi_phy *phy, bool enable) > +{ > + if (!enable) { > + dsi_phy_write(phy->reg_base + > + REG_DSI_28nm_PHY_REGULATOR_CAL_PWR_CFG, 0); > + return; > + } > + > + if (phy->regulator_ldo_mode) > + dsi_28nm_phy_regulator_enable_ldo(phy); > + else > + dsi_28nm_phy_regulator_enable_dcdc(phy); > } > > static int dsi_28nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id, > @@ -77,8 +105,6 @@ static int dsi_28nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id, > > dsi_28nm_phy_regulator_ctrl(phy, true); > > - dsi_phy_write(base + REG_DSI_28nm_PHY_LDO_CNTRL, 0x00); > - > dsi_28nm_dphy_set_timing(phy, timing); > > dsi_phy_write(base + REG_DSI_28nm_PHY_CTRL_1, 0x00); > -- > 2.23.0 > > _______________________________________________ > Freedreno mailing list > Freedreno@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/freedreno -- Sean Paul, Software Engineer, Google / Chromium OS
