drm/meson: add support for HDMI clock support

This patchs adds support for the supported HDMI modes clocks frequencies.
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

drivers/gpu/drm/meson/meson_vclk.h

@@ -23,12 +23,14 @@
 
 enum {
 	MESON_VCLK_TARGET_CVBS = 0,
+	MESON_VCLK_TARGET_HDMI = 1,
 };
 
 /* 27MHz is the CVBS Pixel Clock */
-#define MESON_VCLK_CVBS	27000
+#define MESON_VCLK_CVBS			27000
 
 void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
-		      unsigned int freq);
+		      unsigned int vclk_freq, unsigned int venc_freq,
+		      unsigned int dac_freq, bool hdmi_use_enci);
 
 #endif /* __MESON_VCLK_H */

drivers/gpu/drm/meson/meson_venc_cvbs.c

@@ -32,6 +32,7 @@
 
 #include "meson_venc_cvbs.h"
 #include "meson_venc.h"
+#include "meson_vclk.h"
 #include "meson_registers.h"
 
 /* HHI VDAC Registers */
@@ -194,14 +195,20 @@ static void meson_venc_cvbs_encoder_mode_set(struct drm_encoder *encoder,
 {
 	struct meson_venc_cvbs *meson_venc_cvbs =
 					encoder_to_meson_venc_cvbs(encoder);
+	struct meson_drm *priv = meson_venc_cvbs->priv;
 	int i;
 
 	for (i = 0; i < MESON_CVBS_MODES_COUNT; ++i) {
 		struct meson_cvbs_mode *meson_mode = &meson_cvbs_modes[i];
 
 		if (drm_mode_equal(mode, &meson_mode->mode)) {
-			meson_venci_cvbs_mode_set(meson_venc_cvbs->priv,
+			meson_venci_cvbs_mode_set(priv,
 						  meson_mode->enci);
+
+			/* Setup 27MHz vclk2 for ENCI and VDAC */
+			meson_vclk_setup(priv, MESON_VCLK_TARGET_CVBS,
+					 MESON_VCLK_CVBS, MESON_VCLK_CVBS,
+					 MESON_VCLK_CVBS, true);
 			break;
 		}
 	}