diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2017-07-19 17:55:15 +0800 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-08-28 13:34:37 -0500 |
| commit | f06c6c41e6ccf9c1ec61f640cc9090308b8a63fd (patch) | |
| tree | 2457f0bab259695f91d29fa65cc3511f40af2a84 /drivers/pci/host/pcie-rockchip.c | |
| parent | 90a7612d070d5caf023b34864028ccce5bffd6ce (diff) | |
PCI: rockchip: Idle inactive PHY(s)
Check the status of all lanes and idle the inactive one(s).
Tested-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[bhelgaas: always set lanes_map, even for legacy_phy case]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/pci/host/pcie-rockchip.c')
| -rw-r--r-- | drivers/pci/host/pcie-rockchip.c | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c index 5ccbdbfa97d0..168505777533 100644 --- a/drivers/pci/host/pcie-rockchip.c +++ b/drivers/pci/host/pcie-rockchip.c @@ -15,6 +15,7 @@ * (at your option) any later version. */ +#include <linux/bitrev.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> @@ -112,6 +113,9 @@ #define PCIE_CORE_TXCREDIT_CFG1_MUI_SHIFT 16 #define PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(x) \ (((x) >> 3) << PCIE_CORE_TXCREDIT_CFG1_MUI_SHIFT) +#define PCIE_CORE_LANE_MAP (PCIE_CORE_CTRL_MGMT_BASE + 0x200) +#define PCIE_CORE_LANE_MAP_MASK 0x0000000f +#define PCIE_CORE_LANE_MAP_REVERSE BIT(16) #define PCIE_CORE_INT_STATUS (PCIE_CORE_CTRL_MGMT_BASE + 0x20c) #define PCIE_CORE_INT_PRFPE BIT(0) #define PCIE_CORE_INT_CRFPE BIT(1) @@ -230,6 +234,7 @@ struct rockchip_pcie { struct regulator *vpcie0v9; /* 0.9V power supply */ struct gpio_desc *ep_gpio; u32 lanes; + u8 lanes_map; u8 root_bus_nr; int link_gen; struct device *dev; @@ -302,6 +307,24 @@ static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip, return 1; } +static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip) +{ + u32 val; + u8 map; + + if (rockchip->legacy_phy) + return GENMASK(MAX_LANE_NUM - 1, 0); + + val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP); + map = val & PCIE_CORE_LANE_MAP_MASK; + + /* The link may be using a reverse-indexed mapping. */ + if (val & PCIE_CORE_LANE_MAP_REVERSE) + map = bitrev8(map) >> 4; + + return map; +} + static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip, int where, int size, u32 *val) { @@ -698,6 +721,15 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) PCIE_CORE_PL_CONF_LANE_SHIFT); dev_dbg(dev, "current link width is x%d\n", status); + /* Power off unused lane(s) */ + rockchip->lanes_map = rockchip_pcie_lane_map(rockchip); + for (i = 0; i < MAX_LANE_NUM; i++) { + if (!(rockchip->lanes_map & BIT(i))) { + dev_dbg(dev, "idling lane %d\n", i); + phy_power_off(rockchip->phys[i]); + } + } + rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID, PCIE_CORE_CONFIG_VENDOR); rockchip_pcie_write(rockchip, @@ -1349,7 +1381,9 @@ static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev) } for (i = 0; i < MAX_LANE_NUM; i++) { - phy_power_off(rockchip->phys[i]); + /* inactive lanes are already powered off */ + if (rockchip->lanes_map & BIT(i)) + phy_power_off(rockchip->phys[i]); phy_exit(rockchip->phys[i]); } @@ -1597,7 +1631,9 @@ static int rockchip_pcie_remove(struct platform_device *pdev) irq_domain_remove(rockchip->irq_domain); for (i = 0; i < MAX_LANE_NUM; i++) { - phy_power_off(rockchip->phys[i]); + /* inactive lanes are already powered off */ + if (rockchip->lanes_map & BIT(i)) + phy_power_off(rockchip->phys[i]); phy_exit(rockchip->phys[i]); } |