linux-kernel - [PATCH v1 8/8] HACK: drm: rcar-du: dsi: use-extal-clk hack

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Message-Id: <20221117122547.809644-9-tomi.valkeinen@ideasonboard.com>
Date:   Thu, 17 Nov 2022 14:25:47 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: [PATCH v1 8/8] HACK: drm: rcar-du: dsi: use-extal-clk hack

From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>

Renesas BSP kernel does this for Whitehawk board. It is not clear what
it does, as the bits are marked reserved in the SoC documentation.

Do not merge.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
---
 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
index 723c35726c38..c264cb689664 100644
--- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
@@ -598,6 +598,10 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
 		return -ENODEV;
 	}
 
+	/* XXX HACK for Whitehawk board. "use_extal_clk" from BSP Kernel. */
+	if (dsi->info->model == RCAR_DSI_R8A779G0)
+		rcar_mipi_dsi_set(dsi, CLOCKSET1, 0x0100000C);
+
 	/* PLL Clock Setting */
 	rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_SHADOW_CLEAR);
 	rcar_mipi_dsi_set(dsi, CLOCKSET1, CLOCKSET1_SHADOW_CLEAR);
-- 
2.34.1