slimbus: stream: handle unsupported bitrates for presence rate

Handle errors of getting presence rate for unsupported stream bitrate,
instead of sending -EINVAL in change content message.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221118065246.6835-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/slimbus/stream.c b/drivers/slimbus/stream.c
index 73a2aa3..7e9c818 100644 (file)
--- a/drivers/slimbus/stream.c
+++ b/drivers/slimbus/stream.c
@@ -204,7 +204,7 @@ int slim_stream_prepare(struct slim_stream_runtime *rt,
 {
        struct slim_controller *ctrl = rt->dev->ctrl;
        struct slim_port *port;
-       int num_ports, i, port_id;
+       int num_ports, i, port_id, prrate;
 
        if (rt->ports) {
                dev_err(&rt->dev->dev, "Stream already Prepared\n");
@@ -221,6 +221,13 @@ int slim_stream_prepare(struct slim_stream_runtime *rt,
        rt->bps = cfg->bps;
        rt->direction = cfg->direction;
 
+       prrate = slim_get_prate_code(cfg->rate);
+       if (prrate < 0) {
+               dev_err(&rt->dev->dev, "Cannot get presence rate for rate %d Hz\n",
+                       cfg->rate);
+               return prrate;
+       }
+
        if (cfg->rate % ctrl->a_framer->superfreq) {
                /*
                 * data rate not exactly multiple of super frame,
@@ -241,7 +248,7 @@ int slim_stream_prepare(struct slim_stream_runtime *rt,
                port = &rt->ports[i];
                port->state = SLIM_PORT_DISCONNECTED;
                port->id = port_id;
-               port->ch.prrate = slim_get_prate_code(cfg->rate);
+               port->ch.prrate = prrate;
                port->ch.id = cfg->chs[i];
                port->ch.data_fmt = SLIM_CH_DATA_FMT_NOT_DEFINED;
                port->ch.aux_fmt = SLIM_CH_AUX_FMT_NOT_APPLICABLE;