linux-kernel - [PATCH v1 2/2] drm/bridge/synopsys: dsi: Add a warning msg on dsi read operations

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Date:   Tue, 23 Jan 2018 15:26:18 +0100
From:   Philippe Cornu <philippe.cornu@...com>
To:     Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Philippe Cornu <philippe.cornu@...com>,
        Brian Norris <briannorris@...omium.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Bhumika Goyal <bhumirks@...il.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Sandy Huang" <hjc@...k-chips.com>,
        Heiko Stubner <heiko@...ech.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>
CC:     Yannick Fertre <yannick.fertre@...com>,
        Vincent Abriou <vincent.abriou@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "Maxime Coquelin" <mcoquelin.stm32@...il.com>,
        Ludovic Barre <ludovic.barre@...com>,
        Mickael Reulier <mickael.reulier@...com>
Subject: [PATCH v1 2/2] drm/bridge/synopsys: dsi: Add a warning msg on dsi read operations

The DCS/GENERIC DSI read feature is not yet implemented so it
is important to warn the host_transfer() caller in case of
read operation requests.

Signed-off-by: Philippe Cornu <philippe.cornu@...com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 096cf5e5bb30..e46ddff8601c 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -417,7 +417,14 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 	if (ret)
 		return ret;
 
-	nb_bytes = packet.size;
+	if (msg->rx_buf && msg->rx_len > 0) {
+		/* TODO dw drv improvements: implement read feature */
+		dev_warn(dsi->dev, "read operations not yet implemented\n");
+		return -EPERM;
+
+	} else {
+		nb_bytes = packet.size;
+	}
 
 	return nb_bytes;
 }
-- 
2.15.1