2022-10-13 19:44:26

by Vidya Sagar

Subject: [PATCH V3 04/21] PCI: tegra194: Handle errors in BPMP response

The return value from tegra_bpmp_transfer indicates the success or
failure of the IPC transaction with BPMP. If the transaction
succeeded, we also need to check the actual command's result code.
Add code to do this.

Signed-off-by: Vidya Sagar <[email protected]>
---
V3:
* None

V2:
* None

drivers/pci/controller/dwc/pcie-tegra194.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 685aee378c93..ae7e0d8f693b 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1260,6 +1260,7 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
struct mrq_uphy_response resp;
struct tegra_bpmp_message msg;
struct mrq_uphy_request req;
+ int err;

/*
* Controller-5 doesn't need to have its state set by BPMP-FW in
@@ -1282,7 +1283,13 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
msg.rx.data = &resp;
msg.rx.size = sizeof(resp);

- return tegra_bpmp_transfer(pcie->bpmp, &msg);
+ err = tegra_bpmp_transfer(pcie->bpmp, &msg);
+ if (err)
+ return err;
+ if (msg.rx.ret)
+ return -EINVAL;
+
+ return 0;
}

static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
@@ -1291,6 +1298,7 @@ static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
struct mrq_uphy_response resp;
struct tegra_bpmp_message msg;
struct mrq_uphy_request req;
+ int err;

memset(&req, 0, sizeof(req));
memset(&resp, 0, sizeof(resp));
@@ -1310,7 +1318,13 @@ static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
msg.rx.data = &resp;
msg.rx.size = sizeof(resp);

- return tegra_bpmp_transfer(pcie->bpmp, &msg);
+ err = tegra_bpmp_transfer(pcie->bpmp, &msg);
+ if (err)
+ return err;
+ if (msg.rx.ret)
+ return -EINVAL;
+
+ return 0;
}

static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie)
--
2.17.1

2023-01-13 16:08:03

by Lorenzo Pieralisi

Subject: Re: [PATCH V3 04/21] PCI: tegra194: Handle errors in BPMP response

On Fri, Oct 14, 2022 at 12:08:37AM +0530, Vidya Sagar wrote:
> The return value from tegra_bpmp_transfer indicates the success or
> failure of the IPC transaction with BPMP. If the transaction
> succeeded, we also need to check the actual command's result code.
> Add code to do this.
>
> Signed-off-by: Vidya Sagar <[email protected]>
> ---
> V3:
> * None
>
> V2:
> * None
>
> drivers/pci/controller/dwc/pcie-tegra194.c | 18 ++++++++++++++++--
> 1 file changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index 685aee378c93..ae7e0d8f693b 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -1260,6 +1260,7 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
> struct mrq_uphy_response resp;
> struct tegra_bpmp_message msg;
> struct mrq_uphy_request req;
> + int err;
>
> /*
> * Controller-5 doesn't need to have its state set by BPMP-FW in
> @@ -1282,7 +1283,13 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
> msg.rx.data = &resp;
> msg.rx.size = sizeof(resp);
>
> - return tegra_bpmp_transfer(pcie->bpmp, &msg);
> + err = tegra_bpmp_transfer(pcie->bpmp, &msg);
> + if (err)
> + return err;
> + if (msg.rx.ret)
> + return -EINVAL;
> +
> + return 0;
> }
>
> static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
> @@ -1291,6 +1298,7 @@ static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
> struct mrq_uphy_response resp;
> struct tegra_bpmp_message msg;
> struct mrq_uphy_request req;
> + int err;
>
> memset(&req, 0, sizeof(req));
> memset(&resp, 0, sizeof(resp));
> @@ -1310,7 +1318,13 @@ static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
> msg.rx.data = &resp;
> msg.rx.size = sizeof(resp);
>
> - return tegra_bpmp_transfer(pcie->bpmp, &msg);
> + err = tegra_bpmp_transfer(pcie->bpmp, &msg);
> + if (err)
> + return err;
> + if (msg.rx.ret)
> + return -EINVAL;

I wonder whether you can embed the return value check within
the function itself.

Lorenzo

> +
> + return 0;
> }
>
> static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie)
> --
> 2.17.1
>
>
> --
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> [email protected]
> https://lists.infradead.org/mailman/listinfo/linux-phy