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From:   Philippe Cornu <philippe.cornu@st.com>
To:     Archit Taneja <architt@codeaurora.org>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        David Airlie <airlied@linux.ie>,
        Philippe Cornu <philippe.cornu@st.com>,
        Brian Norris <briannorris@chromium.org>,
        Benjamin Gaignard <benjamin.gaignard@linaro.org>,
        Bhumika Goyal <bhumirks@gmail.com>,
        <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
        "Sandy Huang" <hjc@rock-chips.com>,
        Heiko Stubner <heiko@sntech.de>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-rockchip@lists.infradead.org>
CC:     Yannick Fertre <yannick.fertre@st.com>,
        Vincent Abriou <vincent.abriou@st.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        "Maxime Coquelin" <mcoquelin.stm32@gmail.com>,
        Ludovic Barre <ludovic.barre@st.com>,
        Mickael Reulier <mickael.reulier@st.com>
Subject: [PATCH v1 1/2] drm/bridge/synopsys: dsi: Fix dsi_host_transfer() return value
Date:   Tue, 23 Jan 2018 15:26:17 +0100
Message-ID: <20180123142618.28384-2-philippe.cornu@st.com>
In-Reply-To: <20180123142618.28384-1-philippe.cornu@st.com>
References: <20180123142618.28384-1-philippe.cornu@st.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The dw_mipi_dsi_host_transfer() must return the number of
bytes transmitted/received on success instead of 0.
Note: nb_bytes is introduced in this patch as it will be
re-used with the future dcs/generic dsi read feature.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index f458798af788..096cf5e5bb30 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -403,7 +403,7 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 {
 	struct dw_mipi_dsi *dsi = host_to_dsi(host);
 	struct mipi_dsi_packet packet;
-	int ret;
+	int ret, nb_bytes;
 
 	ret = mipi_dsi_create_packet(&packet, msg);
 	if (ret) {
@@ -413,7 +413,13 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 
 	dw_mipi_message_config(dsi, msg);
 
-	return dw_mipi_dsi_write(dsi, &packet);
+	ret = dw_mipi_dsi_write(dsi, &packet);
+	if (ret)
+		return ret;
+
+	nb_bytes = packet.size;
+
+	return nb_bytes;
 }
 
 static const struct mipi_dsi_host_ops dw_mipi_dsi_host_ops = {
-- 
2.15.1