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SubjectRe: [PATCH 2/4] clk: tegra: check BPMP response return code
On Thu, Sep 07, 2017 at 12:31:02PM +0300, Timo Alho wrote:
> Check return code in BPMP response message(s). The typical error case
> is when clock operation is attempted with invalid clock identifier.
>
> Also remove error print from call to clk_get_info() as the
> implementation loops through range of all possible identifier, but the
> operation is expected error out when the clock id is unused.
>
> Signed-off-by: Timo Alho <talho@nvidia.com>
> ---
> drivers/clk/tegra/clk-bpmp.c | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)

Hi Mike, Stephen,

do you mind if I pick this up into the Tegra tree? It has a build
dependency on patch 1/4.

I only now realized that you guys weren't on Cc, hence quoting in
full.

Thierry

> diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c
> index 638ace6..a896692 100644
> --- a/drivers/clk/tegra/clk-bpmp.c
> +++ b/drivers/clk/tegra/clk-bpmp.c
> @@ -55,6 +55,7 @@ struct tegra_bpmp_clk_message {
> struct {
> void *data;
> size_t size;
> + int ret;
> } rx;
> };
>
> @@ -64,6 +65,7 @@ static int tegra_bpmp_clk_transfer(struct tegra_bpmp *bpmp,
> struct mrq_clk_request request;
> struct tegra_bpmp_message msg;
> void *req = &request;
> + int err;
>
> memset(&request, 0, sizeof(request));
> request.cmd_and_id = (clk->cmd << 24) | clk->id;
> @@ -84,7 +86,13 @@ static int tegra_bpmp_clk_transfer(struct tegra_bpmp *bpmp,
> msg.rx.data = clk->rx.data;
> msg.rx.size = clk->rx.size;
>
> - return tegra_bpmp_transfer(bpmp, &msg);
> + err = tegra_bpmp_transfer(bpmp, &msg);
> + if (err < 0)
> + return err;
> + else if (msg.rx.ret < 0)
> + return -EINVAL;
> +
> + return 0;
> }
>
> static int tegra_bpmp_clk_prepare(struct clk_hw *hw)
> @@ -414,11 +422,8 @@ static int tegra_bpmp_probe_clocks(struct tegra_bpmp *bpmp,
> struct tegra_bpmp_clk_info *info = &clocks[count];
>
> err = tegra_bpmp_clk_get_info(bpmp, id, info);
> - if (err < 0) {
> - dev_err(bpmp->dev, "failed to query clock %u: %d\n",
> - id, err);
> + if (err < 0)
> continue;
> - }
>
> if (info->num_parents >= U8_MAX) {
> dev_err(bpmp->dev,
> --
> 2.7.4
>
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