From 4cda6e8e1ea0e7bc80028fa4fe196357a2799d05 Mon Sep 17 00:00:00 2001 From: Philippe Cornu Date: Thu, 25 Jan 2018 11:37:59 +0100 Subject: [PATCH] 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. Reviewed-by: Brian Norris Signed-off-by: Philippe Cornu Signed-off-by: Archit Taneja Link: https://patchwork.freedesktop.org/patch/msgid/20180125103800.1999-2-philippe.cornu@st.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 c83049d..37d13cca 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c @@ -398,6 +398,12 @@ 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); -- 2.7.4