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

[Tomi Valkeinen]

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

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@xxxxxxxxxxxxxxxx>
---
 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