From: Philippe Cornu Date: Thu, 25 Jan 2018 10:37:59 +0000 (+0100) Subject: drm/bridge/synopsys: dsi: Add a warning msg on dsi read requests X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4cda6e8e1ea0e7bc80028fa4fe196357a2799d05;p=openwrt%2Fstaging%2Fblogic.git 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 --- diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c index c83049d66baf..37d13ccad2e7 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);