linux-kernel - [PATCH 5/5] drm/bridge: nwl-dsi: add support for DCSS

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Message-Id: <1598613212-1113-6-git-send-email-robert.chiras@oss.nxp.com>
Date:   Fri, 28 Aug 2020 14:13:32 +0300
From:   "Robert Chiras (OSS)" <robert.chiras@....nxp.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>,
        Guido Günther <agx@...xcpu.org>,
        Fabio Estevam <festevam@...il.com>,
        Ondrej Jirman <megous@...ous.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com
Subject: [PATCH 5/5] drm/bridge: nwl-dsi: add support for DCSS

From: Laurentiu Palcu <laurentiu.palcu@....com>

DCSS needs active low VSYNC and HSYNC. Also, move the input selection in
the probe function, as this will not change at runtime.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....com>
Signed-off-by: Robert Chiras <robert.chiras@....com>
---
 drivers/gpu/drm/bridge/nwl-dsi.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index ac4aa0a..c30f7a8 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -143,6 +143,7 @@ struct nwl_dsi {
 	struct nwl_dsi_transfer *xfer;
 	struct list_head valid_modes;
 	u32 clk_drop_lvl;
+	bool use_dcss;
 };
 
 static const struct regmap_config nwl_dsi_regmap_config = {
@@ -1036,16 +1037,16 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
 
 static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
 				      const struct drm_display_mode *mode,
-				      struct drm_display_mode *adjusted_mode)
+				      struct drm_display_mode *adjusted)
 {
 	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
 	struct mode_config *config;
 	unsigned long pll_rate;
 
 	DRM_DEV_DEBUG_DRIVER(dsi->dev, "Fixup mode:\n");
-	drm_mode_debug_printmodeline(adjusted_mode);
+	drm_mode_debug_printmodeline(adjusted);
 
-	config = nwl_dsi_mode_probe(dsi, adjusted_mode);
+	config = nwl_dsi_mode_probe(dsi, adjusted);
 	if (!config)
 		return false;
 
@@ -1067,12 +1068,16 @@ static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
 	}
 	/* Update the crtc_clock to be used by display controller */
 	if (config->crtc_clock)
-		adjusted_mode->crtc_clock = config->crtc_clock / 1000;
+		adjusted->crtc_clock = config->crtc_clock / 1000;
 
-
-	/* At least LCDIF + NWL needs active high sync */
-	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
-	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+	if (!dsi->use_dcss) {
+		/* At least LCDIF + NWL needs active high sync */
+		adjusted->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
+		adjusted->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+	} else {
+		adjusted->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
+		adjusted->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+	}
 
 	return true;
 }
@@ -1400,6 +1405,9 @@ static int nwl_dsi_select_input(struct nwl_dsi *dsi)
 		DRM_DEV_ERROR(dsi->dev, "Failed to select input: %d\n", ret);
 
 	of_node_put(remote);
+
+	dsi->use_dcss = use_dcss;
+
 	return ret;
 }
 
-- 
2.7.4