ath10k: enable ASPM
It is actually safe to enable ASPM after the
device is booted up.
This reduces power drain of QCA61X4 when driver is
simply loaded (no interface is up) from 31mA to
14mA. QCA988X wasn't measured but doesn't seem to
regress in any other way.
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 969a123..8be07c6 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -1227,11 +1227,15 @@
static int ath10k_pci_hif_start(struct ath10k *ar)
{
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif start\n");
ath10k_pci_irq_enable(ar);
ath10k_pci_rx_post(ar);
+ pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+ ar_pci->link_ctl);
+
return 0;
}
@@ -1981,6 +1985,7 @@
static int ath10k_pci_hif_power_up(struct ath10k *ar)
{
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
int ret;
ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif power up\n");
@@ -1991,6 +1996,11 @@
return ret;
}
+ pcie_capability_read_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+ &ar_pci->link_ctl);
+ pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+ ar_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+
/*
* Bring the target up cleanly.
*
@@ -2502,7 +2512,6 @@
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
struct pci_dev *pdev = ar_pci->pdev;
- u32 lcr_val;
int ret;
pci_set_drvdata(pdev, ar);
@@ -2536,10 +2545,6 @@
pci_set_master(pdev);
- /* Workaround: Disable ASPM */
- pci_read_config_dword(pdev, 0x80, &lcr_val);
- pci_write_config_dword(pdev, 0x80, (lcr_val & 0xffffff00));
-
/* Arrange for access to Target SoC registers. */
ar_pci->mem = pci_iomap(pdev, BAR_NUM, 0);
if (!ar_pci->mem) {
diff --git a/drivers/net/wireless/ath/ath10k/pci.h b/drivers/net/wireless/ath/ath10k/pci.h
index bddf543..ee2173d 100644
--- a/drivers/net/wireless/ath/ath10k/pci.h
+++ b/drivers/net/wireless/ath/ath10k/pci.h
@@ -185,6 +185,12 @@
/* Map CE id to ce_state */
struct ath10k_ce_pipe ce_states[CE_COUNT_MAX];
struct timer_list rx_post_retry;
+
+ /* Due to HW quirks it is recommended to disable ASPM during device
+ * bootup. To do that the original PCI-E Link Control is stored before
+ * device bootup is executed and re-programmed later.
+ */
+ u16 link_ctl;
};
static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar)