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* [PATCH 1/4] drm/sun4i: tcon: Support an active-low DE signal with RGB interface
@ 2018-10-10 11:41 Paul Kocialkowski
  2018-10-10 11:41 ` [PATCH 2/4] drm/panel: simple: Add support for the Lemaker BL035 3.5" LCD Paul Kocialkowski
                   ` (3 more replies)
  0 siblings, 4 replies; 13+ messages in thread
From: Paul Kocialkowski @ 2018-10-10 11:41 UTC (permalink / raw)
  To: devicetree, linux-arm-kernel, linux-kernel, dri-devel
  Cc: Rob Herring, Mark Rutland, Maxime Ripard, Chen-Yu Tsai,
	Thierry Reding, David Airlie, linux-sunxi, Mark Van den Borre,
	Gerry Demaret, Luc Verhaegen, Paul Kocialkowski

Some panels need an active-low data enable (DE) signal for the RGB
interface. This requires flipping a bit in the TCON0 polarity register
when setting up the mode for the RGB interface.

Add a new helper function to match specific bus flags and use it to set
the polarity inversion bit for the DE signal when required.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c | 28 ++++++++++++++++++++++++++--
 drivers/gpu/drm/sun4i/sun4i_tcon.h |  1 +
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 3fb084f802e2..d249a462ec09 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -78,6 +78,24 @@ static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder)
 	return -EINVAL;
 }
 
+static bool sun4i_tcon_match_bus_flags(const struct drm_encoder *encoder,
+				       u32 bus_flags)
+{
+	struct drm_connector *connector;
+	struct drm_display_info *info;
+
+	connector = sun4i_tcon_get_connector(encoder);
+	if (!connector)
+		return false;
+
+	info = &connector->display_info;
+
+	if ((info->bus_flags & bus_flags) == bus_flags)
+		return true;
+
+	return false;
+}
+
 static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel,
 					  bool enabled)
 {
@@ -415,6 +433,7 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
 }
 
 static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
+				     const struct drm_encoder *encoder,
 				     const struct drm_display_mode *mode)
 {
 	unsigned int bp, hsync, vsync;
@@ -474,8 +493,13 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
 	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 		val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
 
+	if (sun4i_tcon_match_bus_flags(encoder, DRM_BUS_FLAG_DE_LOW))
+		val |= SUN4I_TCON0_IO_POL_DE_NEGATIVE;
+
 	regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,
-			   SUN4I_TCON0_IO_POL_HSYNC_POSITIVE | SUN4I_TCON0_IO_POL_VSYNC_POSITIVE,
+			   SUN4I_TCON0_IO_POL_HSYNC_POSITIVE |
+			   SUN4I_TCON0_IO_POL_VSYNC_POSITIVE |
+			   SUN4I_TCON0_IO_POL_DE_NEGATIVE,
 			   val);
 
 	/* Map output pins to channel 0 */
@@ -596,7 +620,7 @@ void sun4i_tcon_mode_set(struct sun4i_tcon *tcon,
 		sun4i_tcon0_mode_set_lvds(tcon, encoder, mode);
 		break;
 	case DRM_MODE_ENCODER_NONE:
-		sun4i_tcon0_mode_set_rgb(tcon, mode);
+		sun4i_tcon0_mode_set_rgb(tcon, encoder, mode);
 		sun4i_tcon_set_mux(tcon, 0, encoder);
 		break;
 	case DRM_MODE_ENCODER_TVDAC:
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
index f6a071cd5a6f..708399c80561 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
@@ -113,6 +113,7 @@
 
 #define SUN4I_TCON0_IO_POL_REG			0x88
 #define SUN4I_TCON0_IO_POL_DCLK_PHASE(phase)		((phase & 3) << 28)
+#define SUN4I_TCON0_IO_POL_DE_NEGATIVE			BIT(27)
 #define SUN4I_TCON0_IO_POL_HSYNC_POSITIVE		BIT(25)
 #define SUN4I_TCON0_IO_POL_VSYNC_POSITIVE		BIT(24)
 
-- 
2.19.0


^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2018-10-26 11:20 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-10 11:41 [PATCH 1/4] drm/sun4i: tcon: Support an active-low DE signal with RGB interface Paul Kocialkowski
2018-10-10 11:41 ` [PATCH 2/4] drm/panel: simple: Add support for the Lemaker BL035 3.5" LCD Paul Kocialkowski
2018-10-10 14:58   ` Maxime Ripard
2018-10-23 10:08     ` Paul Kocialkowski
2018-10-24 16:57       ` Maxime Ripard
2018-10-10 11:41 ` [PATCH 3/4] ARM: dts: sun7i: Add pinmux configuration for LCD0 RGB888 pins Paul Kocialkowski
2018-10-10 14:59   ` Maxime Ripard
2018-10-10 11:41 ` [PATCH NOT FOR MERGE 4/4] ARM: dts: sun7i-a20-bananapi: Add bindings for the BL035 3.5" LCD Paul Kocialkowski
2018-10-10 14:57 ` [PATCH 1/4] drm/sun4i: tcon: Support an active-low DE signal with RGB interface Maxime Ripard
2018-10-23  9:33   ` Paul Kocialkowski
2018-10-24 16:47     ` Maxime Ripard
2018-10-24 17:24       ` Paul Kocialkowski
2018-10-26 11:20         ` Maxime Ripard

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