On 1/16/20 8:53 AM, Tero Kristo wrote:
> From: Suman Anna <s-anna@xxxxxx>
>
> The reserved memory nodes are not assigned to platform devices by
> default in the driver core to avoid the lookup for every platform
> device and incur a penalty as the real users are expected to be
> only a few devices.
>
> OMAP remoteproc devices fall into the above category and the OMAP
> remoteproc driver _requires_ specific CMA pools to be assigned
> for each device at the moment to align on the location of the
> vrings and vring buffers in the RTOS-side firmware images. So,
Same comment as before, this is a firmware issue for only some firmwares
that do not handle being assigned vring locations correctly and instead
hard-code them.
This is not a requirement of the remote processor itself and so it
should not fail to probe if a specific memory carveout isn't given.
Andrew
> use the of_reserved_mem_device_init/release() API appropriately
> to assign the corresponding reserved memory region to the OMAP
> remoteproc device. Note that only one region per device is
> allowed by the framework.
>
> Signed-off-by: Suman Anna <s-anna@xxxxxx>
> Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> ---
> v5: no changes
>
> drivers/remoteproc/omap_remoteproc.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
> index 0846839b2c97..194303b860b2 100644
> --- a/drivers/remoteproc/omap_remoteproc.c
> +++ b/drivers/remoteproc/omap_remoteproc.c
> @@ -17,6 +17,7 @@
> #include <linux/module.h>
> #include <linux/err.h>
> #include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
> #include <linux/platform_device.h>
> #include <linux/dma-mapping.h>
> #include <linux/remoteproc.h>
> @@ -480,14 +481,22 @@ static int omap_rproc_probe(struct platform_device *pdev)
> if (ret)
> goto free_rproc;
>
> + ret = of_reserved_mem_device_init(&pdev->dev);
> + if (ret) {
> + dev_err(&pdev->dev, "device does not have specific CMA pool\n");
> + goto free_rproc;
> + }
> +
> platform_set_drvdata(pdev, rproc);
>
> ret = rproc_add(rproc);
> if (ret)
> - goto free_rproc;
> + goto release_mem;
>
> return 0;
>
> +release_mem:
> + of_reserved_mem_device_release(&pdev->dev);
> free_rproc:
> rproc_free(rproc);
> return ret;
> @@ -499,6 +508,7 @@ static int omap_rproc_remove(struct platform_device *pdev)
>
> rproc_del(rproc);
> rproc_free(rproc);
> + of_reserved_mem_device_release(&pdev->dev);
>
> return 0;
> }
>
