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Commit a22b8835 authored by Yue Ma's avatar Yue Ma
Browse files

cnss2: Dump debug registers for firmware assert 



There are possibilities that firmware RAM dump collection is stuck
due to MHI in bad state. Dump debug registers to help debug these
issues.

Change-Id: Iae7ec4b21146d5dc6d78df77b87afd7fd00ef5e5
Signed-off-by: default avatarYue Ma <yuem@codeaurora.org>
parent 0d0ad5be

drivers/net/wireless/cnss2/pci.c

+33 −9
Original line number Diff line number Diff line
@@ -231,6 +231,25 @@ int cnss_pci_link_down(struct device *dev) 
}

EXPORT_SYMBOL(cnss_pci_link_down);



static int cnss_pci_check_link_status(struct cnss_pci_data *pci_priv)

{

	u16 device_id;



	if (pci_priv->pci_link_down_ind) {

		cnss_pr_err("PCIe link is down\n");

		return -EIO;

	}



	pci_read_config_word(pci_priv->pci_dev, PCI_DEVICE_ID, &device_id);

	if (device_id != pci_priv->device_id)  {

		cnss_pr_err("PCI device ID mismatch, link possibly down, current read ID: 0x%x, record ID: 0x%x\n",

			    device_id, pci_priv->device_id);

		return -EIO;

	}



	return 0;

}



int cnss_pci_is_device_down(struct device *dev)

{

	struct cnss_plat_data *plat_priv = cnss_bus_dev_to_plat_priv(dev);
@@ -1961,6 +1980,16 @@ static char *cnss_mhi_state_to_str(enum cnss_mhi_state mhi_state) 
	}

};



static void cnss_pci_dump_registers(struct cnss_pci_data *pci_priv)

{

	cnss_pr_dbg("Start to dump debug registers\n");



	if (cnss_pci_check_link_status(pci_priv))

		return;



	mhi_debug_reg_dump(pci_priv->mhi_ctrl);

}



void cnss_pci_collect_dump_info(struct cnss_pci_data *pci_priv, bool in_panic)

{

	struct cnss_plat_data *plat_priv = pci_priv->plat_priv;
@@ -1977,9 +2006,12 @@ void cnss_pci_collect_dump_info(struct cnss_pci_data *pci_priv, bool in_panic) 
		return;

	}



	cnss_pci_dump_registers(pci_priv);



	ret = mhi_download_rddm_img(pci_priv->mhi_ctrl, in_panic);

	if (ret) {

		cnss_pr_err("Failed to download RDDM image, err = %d\n", ret);

		cnss_pci_dump_registers(pci_priv);

		return;

	}
@@ -2081,21 +2113,13 @@ static void cnss_dev_rddm_timeout_hdlr(unsigned long data) 
static int cnss_mhi_link_status(struct mhi_controller *mhi_ctrl, void *priv)

{

	struct cnss_pci_data *pci_priv = priv;

	u16 device_id;



	if (!pci_priv) {

		cnss_pr_err("pci_priv is NULL\n");

		return -EINVAL;

	}



	pci_read_config_word(pci_priv->pci_dev, PCI_DEVICE_ID, &device_id);

	if (device_id != pci_priv->device_id)  {

		cnss_pr_err("PCI device ID mismatch, link possibly down, current read ID: 0x%x, record ID: 0x%x\n",

			    device_id, pci_priv->device_id);

		return -EIO;

	}



	return 0;

	return cnss_pci_check_link_status(pci_priv);

}



static void cnss_mhi_notify_status(struct mhi_controller *mhi_ctrl, void *priv,