The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f8914a14623a79b73f72b2b1ee4cd9b2cb91b735 Mon Sep 17 00:00:00 2001

From: Christian Lamparter chunkeey@gmail.com Date: Fri, 6 Sep 2019 23:54:23 +0200 Subject: [PATCH] ath10k: restore QCA9880-AR1A (v1) detection

This patch restores the old behavior that read the chip_id on the QCA988x before resetting the chip. This needs to be done in this order since the unsupported QCA988x AR1A chips fall off the bus when resetted. Otherwise the next MMIO Op after the reset causes a BUS ERROR and panic.

Cc: stable@vger.kernel.org Fixes: 1a7fecb766c8 ("ath10k: reset chip before reading chip_id in probe") Signed-off-by: Christian Lamparter chunkeey@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org

diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c index bc3dc79de01a..bb44f5a0941b 100644 --- a/drivers/net/wireless/ath/ath10k/pci.c +++ b/drivers/net/wireless/ath/ath10k/pci.c @@ -3486,7 +3486,7 @@ static int ath10k_pci_probe(struct pci_dev *pdev, struct ath10k_pci *ar_pci; enum ath10k_hw_rev hw_rev; struct ath10k_bus_params bus_params = {}; - bool pci_ps; + bool pci_ps, is_qca988x = false; int (*pci_soft_reset)(struct ath10k *ar); int (*pci_hard_reset)(struct ath10k *ar); u32 (*targ_cpu_to_ce_addr)(struct ath10k *ar, u32 addr); @@ -3496,6 +3496,7 @@ static int ath10k_pci_probe(struct pci_dev *pdev, case QCA988X_2_0_DEVICE_ID: hw_rev = ATH10K_HW_QCA988X; pci_ps = false; + is_qca988x = true; pci_soft_reset = ath10k_pci_warm_reset; pci_hard_reset = ath10k_pci_qca988x_chip_reset; targ_cpu_to_ce_addr = ath10k_pci_qca988x_targ_cpu_to_ce_addr; @@ -3615,25 +3616,34 @@ static int ath10k_pci_probe(struct pci_dev *pdev, goto err_deinit_irq; }

+ bus_params.dev_type = ATH10K_DEV_TYPE_LL; + bus_params.link_can_suspend = true; + /* Read CHIP_ID before reset to catch QCA9880-AR1A v1 devices that + * fall off the bus during chip_reset. These chips have the same pci + * device id as the QCA9880 BR4A or 2R4E. So that's why the check. + */ + if (is_qca988x) { + bus_params.chip_id = + ath10k_pci_soc_read32(ar, SOC_CHIP_ID_ADDRESS); + if (bus_params.chip_id != 0xffffffff) { + if (!ath10k_pci_chip_is_supported(pdev->device, + bus_params.chip_id)) + goto err_unsupported; + } + } + ret = ath10k_pci_chip_reset(ar); if (ret) { ath10k_err(ar, "failed to reset chip: %d\n", ret); goto err_free_irq; }

- bus_params.dev_type = ATH10K_DEV_TYPE_LL; - bus_params.link_can_suspend = true; bus_params.chip_id = ath10k_pci_soc_read32(ar, SOC_CHIP_ID_ADDRESS); - if (bus_params.chip_id == 0xffffffff) { - ath10k_err(ar, "failed to get chip id\n"); - goto err_free_irq; - } + if (bus_params.chip_id == 0xffffffff) + goto err_unsupported;

- if (!ath10k_pci_chip_is_supported(pdev->device, bus_params.chip_id)) { - ath10k_err(ar, "device %04x with chip_id %08x isn't supported\n", - pdev->device, bus_params.chip_id); + if (!ath10k_pci_chip_is_supported(pdev->device, bus_params.chip_id)) goto err_free_irq; - }

ret = ath10k_core_register(ar, &bus_params); if (ret) { @@ -3643,6 +3653,10 @@ static int ath10k_pci_probe(struct pci_dev *pdev,

return 0;

+err_unsupported: + ath10k_err(ar, "device %04x with chip_id %08x isn't supported\n", + pdev->device, bus_params.chip_id); + err_free_irq: ath10k_pci_free_irq(ar); ath10k_pci_rx_retry_sync(ar);