drm/meson: Add support for DMT modes on HDMI

This patch adds support for DMT display modes over HDMI.
The modes timings configurations are from the Amlogic Vendor linux tree
and tested over multiples monitors.
Previously only a selected number of CEA modes were supported.

Only these following modes are supported with these changes:
- 640x480@60Hz
- 800x600@60Hz
- 1024x768@60Hz
- 1152x864@75Hz
- 1280x1024@60Hz
- 1600x1200@60Hz
- 1920x1080@60Hz

The associated code to handle the clock rates is also added.

Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1520935670-14187-1-git-send-email-narmstrong@baylibre.com

1 files changed, 11 insertions, 11 deletions

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index d49af17310c9..a393095aac1a 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -538,7 +538,6 @@ static irqreturn_t dw_hdmi_top_thread_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-/* TOFIX Enable support for non-vic modes */
 static enum drm_mode_status
 dw_hdmi_mode_valid(struct drm_connector *connector,
 		   const struct drm_display_mode *mode)
@@ -555,12 +554,12 @@ dw_hdmi_mode_valid(struct drm_connector *connector,
 		mode->vdisplay, mode->vsync_start,
 		mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 
-	/* For now, only accept VIC modes */
-	if (!vic)
-		return MODE_BAD;
-
-	/* For now, filter by supported VIC modes */
-	if (!meson_venc_hdmi_supported_vic(vic))
+	/* Check against non-VIC supported modes */
+	if (!vic) {
+		if (!meson_venc_hdmi_supported_mode(mode))
+			return MODE_BAD;
+	/* Check against supported VIC modes */
+	} else if (!meson_venc_hdmi_supported_vic(vic))
 		return MODE_BAD;
 
 	vclk_freq = mode->clock;
@@ -586,9 +585,14 @@ dw_hdmi_mode_valid(struct drm_connector *connector,
 
 	/* Finally filter by configurable vclk frequencies */
 	switch (vclk_freq) {
+	case 25175:
+	case 40000:
 	case 54000:
+	case 65000:
 	case 74250:
+	case 108000:
 	case 148500:
+	case 162000:
 	case 297000:
 	case 594000:
 		return MODE_OK;
@@ -653,10 +657,6 @@ static void meson_venc_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 	DRM_DEBUG_DRIVER("%d:\"%s\" vic %d\n",
 			 mode->base.id, mode->name, vic);
 
-	/* Should have been filtered */
-	if (!vic)
-		return;
-
 	/* VENC + VENC-DVI Mode setup */
 	meson_venc_hdmi_mode_set(priv, vic, mode);