[PATCH 4/7] staging: mt7621-pci: fix reset lines for each pcie port

[Sergio Paracuellos]

Depending of chip revision reset lines are inverted. It is also
necessary to read PCIE_FTS_NUM register before enabling the phy.
Hence update the code to achieve this.

Fixes: 745eeeac68d7: "staging: mt7621-pci: factor out 'mt7621_pcie_enable_port'
function"
Reported-by: NeilBrown <n...@brown.name>

Signed-off-by: Sergio Paracuellos <sergio.paracuel...@gmail.com>
---
 drivers/staging/mt7621-pci/pci-mt7621.c | 38 +++++++++++++++++++++----
 1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/mt7621-pci/pci-mt7621.c 
b/drivers/staging/mt7621-pci/pci-mt7621.c
index ba81b34dc1b7..1b63706e129b 100644
--- a/drivers/staging/mt7621-pci/pci-mt7621.c
+++ b/drivers/staging/mt7621-pci/pci-mt7621.c
@@ -412,6 +412,33 @@ static void mt7621_enable_phy(struct mt7621_pcie_port 
*port)
        set_phy_for_ssc(port);
 }
 
+static inline void mt7621_control_assert(struct mt7621_pcie_port *port)
+{
+       u32 chip_rev_id = rt_sysc_r32(MT7621_CHIP_REV_ID);
+
+       if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2)
+               reset_control_assert(port->pcie_rst);
+       else
+               reset_control_deassert(port->pcie_rst);
+}
+
+static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
+{
+       u32 chip_rev_id = rt_sysc_r32(MT7621_CHIP_REV_ID);
+
+       if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2)
+               reset_control_deassert(port->pcie_rst);
+       else
+               reset_control_assert(port->pcie_rst);
+}
+
+static void mt7621_reset_port(struct mt7621_pcie_port *port)
+{
+       mt7621_control_assert(port);
+       msleep(100);
+       mt7621_control_deassert(port);
+}
+
 static void setup_cm_memory_region(struct mt7621_pcie *pcie)
 {
        struct resource *mem_resource = &pcie->mem;
@@ -578,12 +605,14 @@ static int mt7621_pcie_init_port(struct mt7621_pcie_port 
*port)
                return err;
        }
 
-       reset_control_assert(port->pcie_rst);
-       reset_control_deassert(port->pcie_rst);
+       mt7621_reset_port(port);
+
+       val = read_config(pcie, slot, PCIE_FTS_NUM);
+       dev_info(dev, "Port %d N_FTS = %x\n", (unsigned int)val, slot);
 
        if ((pcie_port_read(port, RALINK_PCI_STATUS) & PCIE_PORT_LINKUP) == 0) {
                dev_err(dev, "pcie%d no card, disable it (RST & CLK)\n", slot);
-               reset_control_assert(port->pcie_rst);
+               mt7621_control_assert(port);
                rt_sysc_m32(PCIE_PORT_CLK_EN(slot), 0, RALINK_CLKCFG1);
                port->enabled = false;
        } else {
@@ -592,9 +621,6 @@ static int mt7621_pcie_init_port(struct mt7621_pcie_port 
*port)
 
        mt7621_enable_phy(port);
 
-       val = read_config(pcie, slot, PCIE_FTS_NUM);
-       dev_info(dev, "Port %d N_FTS = %x\n", (unsigned int)val, slot);
-
        return 0;
 }
 
-- 
2.19.1

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