drm/msm/dsi: simplify vco_delay handling in dsi_phy_28nm driver

Instead of setting the variable and then using it just in the one place,
determine vco_delay directly at the PLL configuration time.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Tested-by: Stephen Boyd <swboyd@chromium.org> # on sc7180 lazor
Link: https://lore.kernel.org/r/20210331105735.3690009-16-dmitry.baryshkov@linaro.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c

@@ -72,8 +72,6 @@ struct dsi_pll_28nm {
 	struct platform_device *pdev;
 	void __iomem *mmio;
 
-	int vco_delay;
-
 	struct pll_28nm_cached_state cached_state;
 };
 
@@ -212,8 +210,10 @@ static int dsi_pll_28nm_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 	pll_write(base + REG_DSI_28nm_PHY_PLL_SDM_CFG4, 0x00);
 
 	/* Add hardware recommended delay for correct PLL configuration */
-	if (pll_28nm->vco_delay)
-		udelay(pll_28nm->vco_delay);
+	if (pll->cfg->quirks & DSI_PHY_28NM_QUIRK_PHY_LP)
+		udelay(1000);
+	else
+		udelay(1);
 
 	pll_write(base + REG_DSI_28nm_PHY_PLL_REFCLK_CFG, refclk_cfg);
 	pll_write(base + REG_DSI_28nm_PHY_PLL_PWRGEN_CFG, 0x00);
@@ -580,10 +580,6 @@ static int dsi_pll_28nm_init(struct msm_dsi_phy *phy)
 
 	pll = &pll_28nm->base;
 	pll->cfg = phy->cfg;
-	if (phy->cfg->quirks & DSI_PHY_28NM_QUIRK_PHY_LP)
-		pll_28nm->vco_delay = 1000;
-	else
-		pll_28nm->vco_delay = 1;
 
 	ret = pll_28nm_register(pll_28nm, phy->provided_clocks->hws);
 	if (ret) {