lkml.org 
[lkml]   [2022]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] remoteproc: qcom: q6v5: Add interconnect path proxy vote
From

On 25.02.22 5:32, Bjorn Andersson wrote:
> Many remoteproc instances requires that Linux casts a proxy vote for an
> interconnect path during boot, until they can do it themselves. Add
> support for voting for a single path.
>
> As this is a shared problem between both PAS and MSS drivers, the path
> is acquired and votes casted from the common helper code.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Sibi posted recently a patch to add interconnect votes from the modem driver,
> today I needed the same feature for one of the PAS remoteprocs. After
> essentially duplicating Sibi's patch I realized that it doesn't look too bad to
> put this in the common Q6V5 code.
>
> The main difference is that this would be messy if we need to support multiple
> paths, so we probably would have to push it out to the individual drivers at
> that point.
>
> Sibi's patch can be found here.
> https://lore.kernel.org/all/1644813252-12897-3-git-send-email-quic_sibis@quicinc.com/
>
>
> This makes the implementation pick up one path, relevant DT bindings would
> still need to be updated in order be allowed to this in the DeviceTree files.
>
> drivers/remoteproc/qcom_q6v5.c | 21 ++++++++++++++++++++-
> drivers/remoteproc/qcom_q6v5.h | 3 +++
> 2 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c
> index 442a388f8102..5280ec9b5449 100644
> --- a/drivers/remoteproc/qcom_q6v5.c
> +++ b/drivers/remoteproc/qcom_q6v5.c
> @@ -8,6 +8,7 @@
> */
> #include <linux/kernel.h>
> #include <linux/platform_device.h>
> +#include <linux/interconnect.h>
> #include <linux/interrupt.h>
> #include <linux/module.h>
> #include <linux/soc/qcom/qcom_aoss.h>
> @@ -51,9 +52,17 @@ int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5)
> {
> int ret;
>
> + ret = icc_set_bw(q6v5->path, 0, UINT_MAX);
> + if (ret < 0) {
> + dev_err(q6v5->dev, "failed to set bandwidth request\n");
> + return ret;
> + }
> +
> ret = q6v5_load_state_toggle(q6v5, true);
> - if (ret)
> + if (ret) {
> + icc_set_bw(q6v5->path, 0, 0);
> return ret;
> + }
>
> reinit_completion(&q6v5->start_done);
> reinit_completion(&q6v5->stop_done);
> @@ -78,6 +87,9 @@ int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
> disable_irq(q6v5->handover_irq);
> q6v5_load_state_toggle(q6v5, false);
>
> + /* Disable interconnect vote, in case handover never happened */
> + icc_set_bw(q6v5->path, 0, 0);
> +
> return !q6v5->handover_issued;
> }
> EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);
> @@ -160,6 +172,8 @@ static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
> if (q6v5->handover)
> q6v5->handover(q6v5);
>
> + icc_set_bw(q6v5->path, 0, 0);
> +
> q6v5->handover_issued = true;
>
> return IRQ_HANDLED;
> @@ -332,6 +346,11 @@ int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
> return load_state ? -ENOMEM : -EINVAL;
> }
>
> + q6v5->path = devm_of_icc_get(&pdev->dev, NULL);
> + if (IS_ERR(q6v5->path))
> + return dev_err_probe(&pdev->dev, PTR_ERR(q6v5->path),
> + "failed to acquire interconnect path\n");
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(qcom_q6v5_init);

Probably we should also call icc_put(q6v5->path) in qcom_q6v5_deinit().

Reviewed-by: Georgi Djakov <djakov@kernel.org>

Thanks,
Georgi

\
 
 \ /
  Last update: 2022-03-07 19:37    [W:0.059 / U:0.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site