linux-kernel - Re: [PATCH v3 3/3] bus: mhi: host: pci_generic: Add edl callback to enter EDL

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Message-ID: <20240415121200.GH7537@thinkpad>
Date: Mon, 15 Apr 2024 17:42:00 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Qiang Yu <quic_qianyu@...cinc.com>
Cc: quic_jhugo@...cinc.com, mhi@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	quic_cang@...cinc.com, quic_mrana@...cinc.com
Subject: Re: [PATCH v3 3/3] bus: mhi: host: pci_generic: Add edl callback to
 enter EDL

On Mon, Apr 15, 2024 at 04:49:05PM +0800, Qiang Yu wrote:

bus: mhi: host: pci_generic: Add support for triggering EDL mode in modems

> Add mhi_pci_generic_edl_trigger as edl_trigger for some devices (eg. SDX65)
> to enter EDL mode by writing the 0xEDEDEDED cookie to the channel 91
> doorbell register and forcing an SOC reset afterwards.
> 

'Some of the MHI modems like SDX65 based ones are capable of entering the EDL
mode as per the standard triggering mechanism defined in the MHI spec <enter
spec version>. So let's add a common mhi_pci_generic_edl_trigger() function that
triggers the EDL mode in the device when user writes to the <insert full sysfs
entry here> file.'

> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
> ---
>  drivers/bus/mhi/host/pci_generic.c | 47 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 51639bf..cbf8a58 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -27,12 +27,19 @@
>  #define PCI_VENDOR_ID_THALES	0x1269
>  #define PCI_VENDOR_ID_QUECTEL	0x1eac
>  
> +#define MHI_EDL_DB			91
> +#define MHI_EDL_COOKIE			0xEDEDEDED
> +
> +/* Device can enter EDL by first setting edl cookie then issuing inband reset*/
> +#define MHI_PCI_GENERIC_EDL_TRIGGER	BIT(0)

This is not needed as of now. Let the edl_trigger be bool for now. When vendors
want to add their own methods of triggering EDL, we can extend it.

> +
>  /**
>   * struct mhi_pci_dev_info - MHI PCI device specific information
>   * @config: MHI controller configuration
>   * @name: name of the PCI module
>   * @fw: firmware path (if any)
>   * @edl: emergency download mode firmware path (if any)
> + * @edl_trigger: each bit represents a different way to enter EDL

'capable of triggering EDL mode in the device (if supported)'

>   * @bar_num: PCI base address register to use for MHI MMIO register space
>   * @dma_data_width: DMA transfer word size (32 or 64 bits)
>   * @mru_default: default MRU size for MBIM network packets
> @@ -44,6 +51,7 @@ struct mhi_pci_dev_info {
>  	const char *name;
>  	const char *fw;
>  	const char *edl;
> +	unsigned int edl_trigger;
>  	unsigned int bar_num;
>  	unsigned int dma_data_width;
>  	unsigned int mru_default;
> @@ -292,6 +300,7 @@ static const struct mhi_pci_dev_info mhi_qcom_sdx75_info = {
>  	.name = "qcom-sdx75m",
>  	.fw = "qcom/sdx75m/xbl.elf",
>  	.edl = "qcom/sdx75m/edl.mbn",
> +	.edl_trigger = MHI_PCI_GENERIC_EDL_TRIGGER,
>  	.config = &modem_qcom_v2_mhiv_config,
>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>  	.dma_data_width = 32,
> @@ -302,6 +311,7 @@ static const struct mhi_pci_dev_info mhi_qcom_sdx65_info = {
>  	.name = "qcom-sdx65m",
>  	.fw = "qcom/sdx65m/xbl.elf",
>  	.edl = "qcom/sdx65m/edl.mbn",
> +	.edl_trigger = MHI_PCI_GENERIC_EDL_TRIGGER,
>  	.config = &modem_qcom_v1_mhiv_config,
>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>  	.dma_data_width = 32,
> @@ -312,6 +322,7 @@ static const struct mhi_pci_dev_info mhi_qcom_sdx55_info = {
>  	.name = "qcom-sdx55m",
>  	.fw = "qcom/sdx55m/sbl1.mbn",
>  	.edl = "qcom/sdx55m/edl.mbn",
> +	.edl_trigger = MHI_PCI_GENERIC_EDL_TRIGGER,
>  	.config = &modem_qcom_v1_mhiv_config,
>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>  	.dma_data_width = 32,
> @@ -928,6 +939,39 @@ static void health_check(struct timer_list *t)
>  	mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD);
>  }
>  
> +static int mhi_pci_generic_edl_trigger(struct mhi_controller *mhi_cntrl)
> +{
> +	void __iomem *base = mhi_cntrl->regs;
> +	void __iomem *edl_db;
> +	int ret;
> +	u32 val;
> +
> +	ret = mhi_device_get_sync(mhi_cntrl->mhi_dev);
> +	if (ret) {
> +		dev_err(mhi_cntrl->cntrl_dev, "Wake up device fail before trigger EDL\n");

'Failed to wakeup the device'

- Mani

-- 
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