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From:   Maciej Purski <m.purski@samsung.com>
To:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org,
        dri-devel@lists.freedesktop.org
Cc:     David Airlie <airlied@linux.ie>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Archit Taneja <architt@codeaurora.org>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Inki Dae <inki.dae@samsung.com>,
        Joonyoung Shim <jy0922.shim@samsung.com>,
        Seung-Woo Kim <sw0312.kim@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Maciej Purski <m.purski@samsung.com>
Subject: [PATCH 04/12] drm/exynos: add non-panel path to exynos_dsi_enable()
Date:   Mon, 28 May 2018 11:47:08 +0200
Message-id: <1527500833-16005-5-git-send-email-m.purski@samsung.com>
In-reply-to: <1527500833-16005-1-git-send-email-m.purski@samsung.com>
CMS-TYPE: 201P
References: <1527500833-16005-1-git-send-email-m.purski@samsung.com>
        <CGME20180528094725eucas1p2e80e551edb29dd4ab437246f4896d108@eucas1p2.samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

As DSIM can now have a bridge connected as a peripheral, it should be
possible to successfully enable exynos_dsi, when there is no panel
provided.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 8957faf..7d92e50 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1382,27 +1382,26 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	if (dsi->state & DSIM_STATE_ENABLED)
 		return;
 
-	pm_runtime_get_sync(dsi->dev);
-
-	dsi->state |= DSIM_STATE_ENABLED;
-
-	ret = drm_panel_prepare(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_prepare(dsi->panel);
+		if (ret < 0) {
+			return;
+		}
 	}
 
 	exynos_dsi_set_display_mode(dsi);
 	exynos_dsi_set_display_enable(dsi, true);
 
-	ret = drm_panel_enable(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		exynos_dsi_set_display_enable(dsi, false);
-		drm_panel_unprepare(dsi->panel);
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_enable(dsi->panel);
+		if (ret < 0) {
+			exynos_dsi_set_display_enable(dsi, false);
+			drm_panel_unprepare(dsi->panel);
+			return;
+		}
 	}
 
+	dsi->state |= DSIM_STATE_ENABLED;
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
 }
 
-- 
2.7.4