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

[Brian Norris]

On Thu, Jan 25, 2018 at 11:37:59AM +0100, Philippe Cornu wrote:
> 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 at st.com>

Awesome, thanks.

Reviewed-by: Brian Norris <briannorris at chromium.org>

> ---
>  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
>