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@xxxxxx>
---
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
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