[4/4] drm/sun4i: lvds: Support data and clock polarity flags
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Message ID 011bbc064e12acb5d8848721f8ff94e50754a9e4.1581682983.git-series.maxime@cerno.tech
State New
Headers show
Series
  • drm/sun4i: Support clock and data polarities on LVDS output
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Commit Message

Maxime Ripard Feb. 14, 2020, 12:24 p.m. UTC
Our LVDS encoder can change the polarity of data and clock signals on
the LVDS link. Make sure we don't ignore the matching bus flags.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

Patch
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diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index c81cdce6ed55..fdf143042f83 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -404,6 +404,8 @@  static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
 				      const struct drm_encoder *encoder,
 				      const struct drm_display_mode *mode)
 {
+	struct drm_connector *connector = sun4i_tcon_get_connector(encoder);
+	const struct drm_display_info *info = &connector->display_info;
 	unsigned int bp;
 	u8 clk_delay;
 	u32 reg, val = 0;
@@ -449,9 +451,17 @@  static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
 		     SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
 		     SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
 
-	reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0 |
-		SUN4I_TCON0_LVDS_IF_DATA_POL_NORMAL |
-		SUN4I_TCON0_LVDS_IF_CLK_POL_NORMAL;
+	reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0;
+	if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
+		reg |= SUN4I_TCON0_LVDS_IF_CLK_POL_INV;
+	else
+		reg |= SUN4I_TCON0_LVDS_IF_CLK_POL_NORMAL;
+
+	if (info->bus_flags & DRM_BUS_FLAG_DATA_LOW)
+		reg |= SUN4I_TCON0_LVDS_IF_DATA_POL_INV;
+	else
+		reg |= SUN4I_TCON0_LVDS_IF_DATA_POL_NORMAL;
+
 	if (sun4i_tcon_get_pixel_depth(encoder) == 24)
 		reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_24BITS;
 	else