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SubjectRe: [PATCH v2 2/2] remoteproc: qcom: Add support for parsing fw dt bindings
On Thu 27 Dec 20:48 PST 2018, Sibi Sankar wrote:

> Add support for parsing "firmware-name" dt bindings which specifies
> the relative paths of mba/modem/pas image as strings. Fallback to
> the default paths for mba/modem/pas image on -EINVAL.
>
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>

Thanks Sibi, just some minor style issues I would prefer to have fixed.

I picked patch 1, so no need to resend that.

> ---
> drivers/remoteproc/qcom_q6v5_mss.c | 46 +++++++++++++++++++++++-------
> drivers/remoteproc/qcom_q6v5_pas.c | 11 ++++++-
> 2 files changed, 46 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 01be7314e176..c75179006e24 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -188,6 +188,7 @@ struct q6v5 {
> bool has_alt_reset;
> int mpss_perm;
> int mba_perm;
> + const char *hexagon_mdt_image;
> int version;
> };
>
> @@ -860,17 +861,27 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> phys_addr_t min_addr = PHYS_ADDR_MAX;
> phys_addr_t max_addr = 0;
> bool relocate = false;
> - char seg_name[10];
> + char *fw_name;
> + size_t fw_name_len;
> ssize_t offset;
> size_t size = 0;
> void *ptr;
> int ret;
> int i;
>
> - ret = request_firmware(&fw, "modem.mdt", qproc->dev);
> + fw_name_len = strlen(qproc->hexagon_mdt_image);
> + if (fw_name_len <= 4)
> + return -EINVAL;
> +
> + fw_name = kstrdup(qproc->hexagon_mdt_image, GFP_KERNEL);
> + if (!fw_name)
> + return -ENOMEM;
> +
> + ret = request_firmware(&fw, qproc->hexagon_mdt_image, qproc->dev);

Use fw_name here.

> if (ret < 0) {
> - dev_err(qproc->dev, "unable to load modem.mdt\n");
> - return ret;
> + dev_err(qproc->dev, "unable to load %s\n",
> + qproc->hexagon_mdt_image);
> + goto out;
> }
>
> /* Initialize the RMB validator */
> @@ -918,10 +929,12 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> ptr = qproc->mpss_region + offset;
>
> if (phdr->p_filesz) {
> - snprintf(seg_name, sizeof(seg_name), "modem.b%02d", i);
> - ret = request_firmware(&seg_fw, seg_name, qproc->dev);
> + snprintf(fw_name + fw_name_len - 3, fw_name_len,
> + "b%02d", i);
> + ret = request_firmware(&seg_fw, fw_name, qproc->dev);
> if (ret) {
> - dev_err(qproc->dev, "failed to load %s\n", seg_name);
> + dev_err(qproc->dev, "failed to load %s\n",
> + fw_name);

Follow my lead and break the 80-char limit.

> goto release_firmware;
> }
>
> @@ -960,6 +973,8 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
>
> release_firmware:
> release_firmware(fw);
> +out:
> + kfree(fw_name);
>
> return ret < 0 ? ret : 0;
> }
> @@ -1075,9 +1090,10 @@ static int qcom_q6v5_register_dump_segments(struct rproc *rproc,
> unsigned long i;
> int ret;
>
> - ret = request_firmware(&fw, "modem.mdt", qproc->dev);
> + ret = request_firmware(&fw, qproc->hexagon_mdt_image, qproc->dev);
> if (ret < 0) {
> - dev_err(qproc->dev, "unable to load modem.mdt\n");
> + dev_err(qproc->dev, "unable to load %s\n",
> + qproc->hexagon_mdt_image);
> return ret;
> }
>
> @@ -1253,6 +1269,8 @@ static int q6v5_probe(struct platform_device *pdev)
> const struct rproc_hexagon_res *desc;
> struct q6v5 *qproc;
> struct rproc *rproc;
> + const char *mba_image;
> + const char *fw_name[2];
> int ret;
>
> desc = of_device_get_match_data(&pdev->dev);
> @@ -1262,8 +1280,15 @@ static int q6v5_probe(struct platform_device *pdev)
> if (desc->need_mem_protection && !qcom_scm_is_available())
> return -EPROBE_DEFER;
>
> + ret = of_property_read_string_array(pdev->dev.of_node, "firmware-name",
> + fw_name, 2);
> + if (ret != -EINVAL && ret != 2)
> + return ret > 0 ? -EINVAL : ret;
> +
> + mba_image = (ret != 2) ? desc->hexagon_mba_image : fw_name[0];

Use the fact that of_property_read_string_index() leaves the output
parameter untouched if it doesn't succeed in parsing the property.

I.e. do:

mba_image = desc->hexagon_mba_image;
ret = of_property_read_string_index(pdev->dev.of_node, "firmware-name",
0, &mba_image);
if (ret < 0 && ret != -EINVAL)
fail();

and

qproc->hexagon_mdt_image = "modem.mdt";
ret = of_property_read_string_index(pdev->dev.of_node, "firmware-name",
1, &qproc->hexagon_mdt_image);
if (ret < 0 && ret != -EINVAL)
fail();

> +
> rproc = rproc_alloc(&pdev->dev, pdev->name, &q6v5_ops,
> - desc->hexagon_mba_image, sizeof(*qproc));
> + mba_image, sizeof(*qproc));
> if (!rproc) {
> dev_err(&pdev->dev, "failed to allocate rproc\n");
> return -ENOMEM;
> @@ -1272,6 +1297,7 @@ static int q6v5_probe(struct platform_device *pdev)
> qproc = (struct q6v5 *)rproc->priv;
> qproc->dev = &pdev->dev;
> qproc->rproc = rproc;
> + qproc->hexagon_mdt_image = (ret != 2) ? "modem.mdt" : fw_name[1];
> platform_set_drvdata(pdev, qproc);
>
> ret = q6v5_init_mem(qproc, pdev);
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index b1e63fcd5fdf..141c7da29e9a 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -258,6 +258,8 @@ static int adsp_probe(struct platform_device *pdev)
> const struct adsp_data *desc;
> struct qcom_adsp *adsp;
> struct rproc *rproc;
> + const char *fw_name;
> + const char *of_fw_name;
> int ret;
>
> desc = of_device_get_match_data(&pdev->dev);
> @@ -267,8 +269,15 @@ static int adsp_probe(struct platform_device *pdev)
> if (!qcom_scm_is_available())
> return -EPROBE_DEFER;
>
> + ret = of_property_read_string(pdev->dev.of_node, "firmware-name",
> + &of_fw_name);
> + if (ret && ret != -EINVAL)
> + return ret;
> +
> + fw_name = ret ? desc->firmware_name : of_fw_name;

As above, please use the fact that the last parameter of
of_property_read_string() doesn't modify the output if it fails.

> +
> rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_ops,
> - desc->firmware_name, sizeof(*adsp));
> + fw_name, sizeof(*adsp));
> if (!rproc) {
> dev_err(&pdev->dev, "unable to allocate remoteproc\n");
> return -ENOMEM;

Regards,
Bjorn

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