drm/i915/dpll: use intel_de_wait_custom() instead of wait_for_us()

Prefer the register read specific wait function over i915 wait_for_us().

Reviewed-by: Gustavo Sousa <[e-mail]>
Link: https://lore.kernel.org/r/d8c[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/display/intel_dpll_mgr.c

···
 	enum dpio_phy phy = DPIO_PHY0;
 	enum dpio_channel ch = DPIO_CH0;
 	u32 temp;
+	int ret;
 
 	bxt_port_to_phy_channel(display, port, &phy, &ch);
 
···
 		intel_de_rmw(display, BXT_PORT_PLL_ENABLE(port),
 			     0, PORT_PLL_POWER_ENABLE);
 
-		if (wait_for_us((intel_de_read(display, BXT_PORT_PLL_ENABLE(port)) &
-				 PORT_PLL_POWER_STATE), 200))
+		ret = intel_de_wait_custom(display, BXT_PORT_PLL_ENABLE(port),
+					   PORT_PLL_POWER_STATE, PORT_PLL_POWER_STATE,
+					   200, 0, NULL);
+		if (ret)
 			drm_err(display->drm,
 				"Power state not set for PLL:%d\n", port);
 	}
···
 	intel_de_rmw(display, BXT_PORT_PLL_ENABLE(port), 0, PORT_PLL_ENABLE);
 	intel_de_posting_read(display, BXT_PORT_PLL_ENABLE(port));
 
-	if (wait_for_us((intel_de_read(display, BXT_PORT_PLL_ENABLE(port)) & PORT_PLL_LOCK),
-			200))
+	ret = intel_de_wait_custom(display, BXT_PORT_PLL_ENABLE(port),
+				   PORT_PLL_LOCK, PORT_PLL_LOCK,
+				   200, 0, NULL);
+	if (ret)
 		drm_err(display->drm, "PLL %d not locked\n", port);
 
 	if (display->platform.geminilake) {
···
 				struct intel_dpll *pll)
 {
 	enum port port = (enum port)pll->info->id; /* 1:1 port->PLL mapping */
+	int ret;
 
 	intel_de_rmw(display, BXT_PORT_PLL_ENABLE(port), PORT_PLL_ENABLE, 0);
 	intel_de_posting_read(display, BXT_PORT_PLL_ENABLE(port));
···
 		intel_de_rmw(display, BXT_PORT_PLL_ENABLE(port),
 			     PORT_PLL_POWER_ENABLE, 0);
 
-		if (wait_for_us(!(intel_de_read(display, BXT_PORT_PLL_ENABLE(port)) &
-				  PORT_PLL_POWER_STATE), 200))
+		ret = intel_de_wait_custom(display, BXT_PORT_PLL_ENABLE(port),
+					   PORT_PLL_POWER_STATE, 0,
+					   200, 0, NULL);
+		if (ret)
 			drm_err(display->drm,
 				"Power state not reset for PLL:%d\n", port);
 	}