drm: meson: add macro used to enable HDMI PLL

This patch add new macro HHI_HDMI_PLL_CNTL_EN which is used to enable
HDMI PLL.
Signed-off-by: Julien Masson <jmasson@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/86o92n82e1.fsf@baylibre.com

drivers/gpu/drm/meson/meson_vclk.c

@@ -97,6 +97,7 @@
 #define HHI_VDAC_CNTL1		0x2F8 /* 0xbe offset in data sheet */
 
 #define HHI_HDMI_PLL_CNTL	0x320 /* 0xc8 offset in data sheet */
+#define HHI_HDMI_PLL_CNTL_EN	BIT(30)
 #define HHI_HDMI_PLL_CNTL2	0x324 /* 0xc9 offset in data sheet */
 #define HHI_HDMI_PLL_CNTL3	0x328 /* 0xca offset in data sheet */
 #define HHI_HDMI_PLL_CNTL4	0x32C /* 0xcb offset in data sheet */
@@ -469,7 +470,7 @@ void meson_hdmi_pll_set_params(struct meson_drm *priv, unsigned int m,
 
 		/* Enable and unreset */
 		regmap_update_bits(priv->hhi, HHI_HDMI_PLL_CNTL,
-				   0x7 << 28, 0x4 << 28);
+				   0x7 << 28, HHI_HDMI_PLL_CNTL_EN);
 
 		/* Poll for lock bit */
 		regmap_read_poll_timeout(priv->hhi, HHI_HDMI_PLL_CNTL,