linux-kernel - [PATCH v2 1/2] drm/bridge/synopsys: dsi: Add a warning msg on dsi read requests

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Date:   Thu, 25 Jan 2018 11:37:59 +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 v2 1/2] drm/bridge/synopsys: dsi: Add a warning msg on dsi read requests

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 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index daec7881be6d..72ecaeb40822 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -405,6 +405,12 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 	struct mipi_dsi_packet packet;
 	int ret;
 
+	if (msg->rx_buf || msg->rx_len) {
+		/* TODO dw drv improvements: implement read feature */
+		dev_warn(dsi->dev, "read operations not yet implemented\n");
+		return -EINVAL;
+	}
+
 	ret = mipi_dsi_create_packet(&packet, msg);
 	if (ret) {
 		dev_err(dsi->dev, "failed to create packet: %d\n", ret);
-- 
2.15.1