drm/msm/dsi_phy_10nm: implement PHY disabling

Implement phy_disable() callback to disable DSI PHY lanes and blocks
when phy is not used.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Fixes: ff73ff1 ("drm/msm/dsi: Populate the 10nm PHY funcs")
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c

@@ -192,6 +192,28 @@ static int dsi_10nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 
 static void dsi_10nm_phy_disable(struct msm_dsi_phy *phy)
 {
+	void __iomem *base = phy->base;
+	u32 data;
+
+	DBG("");
+
+	if (dsi_phy_hw_v3_0_is_pll_on(phy))
+		pr_warn("Turning OFF PHY while PLL is on\n");
+
+	dsi_phy_hw_v3_0_config_lpcdrx(phy, false);
+	data = dsi_phy_read(base + REG_DSI_10nm_PHY_CMN_CTRL_0);
+
+	/* disable all lanes */
+	data &= ~0x1F;
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_CTRL_0, data);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_LANE_CTRL0, 0);
+
+	/* Turn off all PHY blocks */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_CTRL_0, 0x00);
+	/* make sure phy is turned off */
+	wmb();
+
+	DBG("DSI%d PHY disabled", phy->id);
 }
 
 static int dsi_10nm_phy_init(struct msm_dsi_phy *phy)