mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-21 00:10:09 +00:00
Code Issues Releases Wiki Activity

phy: ti-pipe3: Fix SATA & USB PHY power up sequence

Browse source 
As per "Table 26-7. SATA PHY Subsystem Low-Level Programming Sequence"
in TRM [1] we need to turn on SATA_PHY_TX before SATA_PHY_RX.

[1] DRA75x, DRA74x TRM - http://www.ti.com/lit/ug/sprui30f/sprui30f.pdf

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Roger Quadros 2019-03-22 10:58:06 +02:00 committed by Kishon Vijay Abraham I
parent fdef2f9f70
commit 9d009d9c20
1 changed files with 30 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

44
drivers/phy/ti/phy-ti-pipe3.c
View file

@ -56,14 +56,14 @@
#define SATA_PLL_SOFT_RESET BIT(18)
#define PIPE3_PHY_PWRCTL_CLK_CMD_MASK 0x003FC000
#define PIPE3_PHY_PWRCTL_CLK_CMD_MASK GENMASK(21, 14)
#define PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT 14
#define PIPE3_PHY_PWRCTL_CLK_FREQ_MASK 0xFFC00000
#define PIPE3_PHY_PWRCTL_CLK_FREQ_MASK GENMASK(31, 22)
#define PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT 22
#define PIPE3_PHY_TX_RX_POWERON 0x3
#define PIPE3_PHY_TX_RX_POWEROFF 0x0
#define PIPE3_PHY_RX_POWERON (0x1 << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT)
#define PIPE3_PHY_TX_POWERON (0x2 << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT)
#define PCIE_PCS_MASK 0xFF0000
#define PCIE_PCS_DELAY_COUNT_SHIFT 0x10
@ -328,7 +328,6 @@ static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
static int ti_pipe3_power_off(struct phy *x)
{
u32 val;
int ret;
struct ti_pipe3 *phy = phy_get_drvdata(x);
@ -337,10 +336,8 @@ static int ti_pipe3_power_off(struct phy *x)
return 0;
}
val = PIPE3_PHY_TX_RX_POWEROFF << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
PIPE3_PHY_PWRCTL_CLK_CMD_MASK, val);
PIPE3_PHY_PWRCTL_CLK_CMD_MASK, 0);
return ret;
}
@ -351,6 +348,7 @@ static int ti_pipe3_power_on(struct phy *x)
int ret;
unsigned long rate;
struct ti_pipe3 *phy = phy_get_drvdata(x);
bool rx_pending = false;
if (!phy->phy_power_syscon) {
omap_control_phy_power(phy->control_dev, 1);
@ -363,14 +361,32 @@ static int ti_pipe3_power_on(struct phy *x)
return -EINVAL;
}
rate = rate / 1000000;
mask = OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK;
val = PIPE3_PHY_TX_RX_POWERON << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
val |= rate << OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
mask = OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK;
val = rate << OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
mask, val);
return ret;
/*
* For PCIe, TX and RX must be powered on simultaneously.
* For USB and SATA, TX must be powered on before RX
*/
mask = OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
if (phy->mode == PIPE3_MODE_SATA || phy->mode == PIPE3_MODE_USBSS) {
val = PIPE3_PHY_TX_POWERON;
rx_pending = true;
} else {
val = PIPE3_PHY_TX_POWERON | PIPE3_PHY_RX_POWERON;
}
regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
mask, val);
if (rx_pending) {
val = PIPE3_PHY_TX_POWERON | PIPE3_PHY_RX_POWERON;
regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
mask, val);
}
return 0;
}
static int ti_pipe3_dpll_wait_lock(struct ti_pipe3 *phy)