linux-kernel - [PATCH v2 06/11] drm/rockchip/dsi: return probe defer if attach panel failed

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Date:   Mon, 16 Jan 2017 18:08:26 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     dianders@...omium.org, tfiga@...omium.org, heiko@...ech.de,
        yzq@...k-chips.com, mark.rutland@....com,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        galak@...eaurora.org, pawel.moll@....com, seanpaul@...omium.org
Cc:     linux-rockchip@...ts.infradead.org,
        Mark Yao <mark.yao@...k-chips.com>,
        Chris Zhong <zyw@...k-chips.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/11] drm/rockchip/dsi: return probe defer if attach panel failed

From: Mark Yao <mark.yao@...k-chips.com>

Return -EINVAL would cause mipi dsi bad behavior, probe defer
to ensure mipi find the correct mode,

Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
Signed-off-by: Chris Zhong <zyw@...k-chips.com>
---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index d2a3efb..5e3f031 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -549,10 +549,14 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->channel = device->channel;
 	dsi->format = device->format;
 	dsi->panel = of_drm_find_panel(device->dev.of_node);
-	if (dsi->panel)
-		return drm_panel_attach(dsi->panel, &dsi->connector);
+	if (!dsi->panel) {
+		DRM_ERROR("failed to find panel\n");
+		return -EPROBE_DEFER;
+	}
 
-	return -EINVAL;
+	drm_panel_attach(dsi->panel, &dsi->connector);
+
+	return 0;
 }
 
 static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
@@ -560,7 +564,8 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
 {
 	struct dw_mipi_dsi *dsi = host_to_dsi(host);
 
-	drm_panel_detach(dsi->panel);
+	if (dsi->panel)
+		drm_panel_detach(dsi->panel);
 
 	return 0;
 }
-- 
2.6.3