From: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
To: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Thierry Reding <thierry.reding@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>, Sean Paul <sean@poorly.run>,
Andrzej Hajda <a.hajda@samsung.com>
Cc: Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
Sam Ravnborg <sam@ravnborg.org>,
Simon Horman <horms@verge.net.au>,
Magnus Damm <magnus.damm@gmail.com>,
Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Chris Paterson <Chris.Paterson2@renesas.com>,
Biju Das <biju.das@bp.renesas.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Jacopo Mondi <jacopo+renesas@jmondi.org>,
ebiharaml@si-linux.co.jp
Subject: [PATCH v6 3/6] drm: rcar-du: lvds: Get dual link configuration from DT
Date: Tue, 17 Dec 2019 13:45:58 +0000 [thread overview]
Message-ID: <1576590361-28244-4-git-send-email-fabrizio.castro@bp.renesas.com> (raw)
In-Reply-To: <1576590361-28244-1-git-send-email-fabrizio.castro@bp.renesas.com>
For dual-LVDS configurations, it is now possible to mark the
DT port nodes for the sink with boolean properties (like
dual-lvds-even-pixels and dual-lvds-odd-pixels) to let drivers
know the encoders need to be configured in dual-LVDS mode.
Rework the implementation of rcar_lvds_parse_dt_companion
to make use of the DT markers while keeping backward
compatibility.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v5->v6:
* No change
v4->v5:
* Addressed comments from Laurent's review
v3->v4:
* New patch extracted from patch:
"drm: rcar-du: lvds: Add dual-LVDS panels support"
---
drivers/gpu/drm/rcar-du/rcar_lvds.c | 54 +++++++++++++++++++++++++++++++------
1 file changed, 46 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index da71107..fdbd36b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -678,7 +678,10 @@ static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds)
{
const struct of_device_id *match;
struct device_node *companion;
+ struct device_node *port0, *port1;
+ struct rcar_lvds *companion_lvds;
struct device *dev = lvds->dev;
+ int dual_link;
int ret = 0;
/* Locate the companion LVDS encoder for dual-link operation, if any. */
@@ -697,13 +700,54 @@ static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds)
goto done;
}
+ /*
+ * We need to work out if the sink is expecting us to function in
+ * dual-link mode. We do this by looking at the DT port nodes we are
+ * connected to, if they are marked as expecting even pixels and
+ * odd pixels than we need to enable vertical stripe output.
+ */
+ port0 = of_graph_get_port_by_id(dev->of_node, 1);
+ port1 = of_graph_get_port_by_id(companion, 1);
+ dual_link = drm_of_lvds_get_dual_link_pixel_order(port0, port1);
+ of_node_put(port0);
+ of_node_put(port1);
+
+ if (dual_link >= DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS)
+ lvds->dual_link = true;
+ else if (lvds->next_bridge && lvds->next_bridge->timings)
+ /*
+ * Early dual-link bridge specific implementations populate the
+ * timings field of drm_bridge, read the dual_link flag off the
+ * bridge directly for backward compatibility.
+ */
+ lvds->dual_link = lvds->next_bridge->timings->dual_link;
+
+ if (!lvds->dual_link) {
+ dev_dbg(dev, "Single-link configuration detected\n");
+ goto done;
+ }
+
lvds->companion = of_drm_find_bridge(companion);
if (!lvds->companion) {
ret = -EPROBE_DEFER;
goto done;
}
- dev_dbg(dev, "Found companion encoder %pOF\n", companion);
+ dev_dbg(dev,
+ "Dual-link configuration detected (companion encoder %pOF)\n",
+ companion);
+
+ /*
+ * FIXME: We should not be messing with the companion encoder private
+ * data from the primary encoder, we should rather let the companion
+ * encoder work things out on its own. However, the companion encoder
+ * doesn't hold a reference to the primary encoder, and
+ * drm_of_lvds_get_dual_link_pixel_order needs to be given references
+ * to the output ports of both encoders, therefore leave it like this
+ * for the time being.
+ */
+ companion_lvds = bridge_to_rcar_lvds(lvds->companion);
+ companion_lvds->dual_link = true;
done:
of_node_put(companion);
@@ -720,13 +764,7 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
if (ret)
goto done;
- if ((lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) &&
- lvds->next_bridge)
- lvds->dual_link = lvds->next_bridge->timings
- ? lvds->next_bridge->timings->dual_link
- : false;
-
- if (lvds->dual_link)
+ if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK)
ret = rcar_lvds_parse_dt_companion(lvds);
done:
--
2.7.4
next prev parent reply other threads:[~2019-12-17 13:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-17 13:45 [PATCH v6 0/6] Add dual-LVDS panel support to EK874 Fabrizio Castro
2019-12-17 13:45 ` [PATCH v6 1/6] drm: of: Add drm_of_lvds_get_dual_link_pixel_order Fabrizio Castro
2019-12-17 13:45 ` [PATCH v6 2/6] drm: rcar-du: lvds: Improve identification of panels Fabrizio Castro
2019-12-17 13:45 ` Fabrizio Castro [this message]
2019-12-17 13:45 ` [PATCH v6 4/6] drm: rcar-du: lvds: Allow for even and odd pixels swap Fabrizio Castro
2019-12-17 13:46 ` [PATCH v6 5/6] dt-bindings: display: Add idk-2121wr binding Fabrizio Castro
2019-12-18 20:20 ` Rob Herring
2019-12-18 20:21 ` Rob Herring
2019-12-17 13:46 ` [PATCH v6 6/6] arm64: dts: renesas: Add EK874 board with idk-2121wr display support Fabrizio Castro
2019-12-17 23:13 ` [PATCH v6 0/6] Add dual-LVDS panel support to EK874 Laurent Pinchart
2020-01-17 8:47 ` Geert Uytterhoeven
2020-01-17 9:22 ` Sam Ravnborg
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