On Mon, Mar 28, 2016 at 09:35:25PM -0700, Bjorn Andersson wrote:
> We need the signal from wcnss_ctrl indicating that the firmware is up
> and running before we can communicate with the other components of the
> chip. So make these other components children of the wcnss_ctrl device,
> so they can be probed in order.
>
> The process seems to take between 1/2-5 seconds, so this is done in a
> worker, instead of holding up the probe.
>
> Also adding the wait for a cbc completion if the firmware indicates this is
> needed - like on 8016.
Can you define what a CBC is?
<snip>
> /**
> * wcnss_download_nv() - send nv binary to WCNSS
> - * @work: work struct to acquire wcnss context
> + * @wcnss: wcnss_ctrl state handle
> + *
> + * Returns 1 on success or 2 to indicate upcoming cbc completion. Negative
maybe a nit, but define the return values
> + * errno on failure.
> */
> -static void wcnss_download_nv(struct work_struct *work)
> +static int wcnss_download_nv(struct wcnss_ctrl *wcnss)
> {
> - struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, download_nv_work);
> struct wcnss_download_nv_req *req;
> const struct firmware *fw;
> const void *data;
> @@ -178,7 +207,7 @@ static void wcnss_download_nv(struct work_struct *work)
>
> req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
> if (!req)
> - return;
> + return -ENOMEM;
>
> ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
> if (ret) {
<snip>
> +static void wcnss_async_probe(struct work_struct *work)
> +{
> + struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, probe_work);
> + int ret;
> +
> + ret = wcnss_request_version(wcnss);
> + if (ret < 0)
> + return;
> +
> + ret = wcnss_download_nv(wcnss);
> + if (ret < 0)
> + return;
> +
> + /* Wait for pending CBC completion if download nv returns 2 */
> + if (ret == 2) {
Perhaps have a #define for the value is warranted
> + ret = wait_for_completion_timeout(&wcnss->cbc, WCNSS_REQUEST_TIMEOUT);
> + if (!ret)
> + dev_err(wcnss->dev, "expected cbc completion\n");
> + }
> +
> + of_platform_populate(wcnss->dev->of_node, NULL, NULL, wcnss->dev);
> }
<snip>
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