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Subject[PATCH v2 06/14] phy: cadence-torrent: Refactor code for reusability
Date
From: Swapnil Jakhade <sjakhade@cadence.com>

Add a separate function to set different power state values.
Use uniform polling timeout value. Also check return values
of functions for proper error handling.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
---
drivers/phy/cadence/phy-cadence-torrent.c | 230 ++++++++++++++++++------------
1 file changed, 137 insertions(+), 93 deletions(-)

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index 5c7c185..b180fba 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -22,7 +22,7 @@
#define MAX_NUM_LANES 4
#define DEFAULT_MAX_BIT_RATE 8100 /* in Mbps */

-#define POLL_TIMEOUT_US 2000
+#define POLL_TIMEOUT_US 5000
#define LANE_MASK 0x7

/*
@@ -39,6 +39,7 @@
#define PHY_POWER_STATE_LN_1 0x0008
#define PHY_POWER_STATE_LN_2 0x0010
#define PHY_POWER_STATE_LN_3 0x0018
+#define PMA_XCVR_POWER_STATE_REQ_LN_MASK 0x3FU
#define PHY_PMA_XCVR_POWER_STATE_ACK 0x30
#define PHY_PMA_CMN_READY 0x34
#define PHY_PMA_XCVR_TX_VMARGIN 0x38
@@ -109,10 +110,17 @@ struct cdns_torrent_phy {
struct device *dev;
};

+enum phy_powerstate {
+ POWERSTATE_A0 = 0,
+ /* Powerstate A1 is unused */
+ POWERSTATE_A2 = 2,
+ POWERSTATE_A3 = 3,
+};
+
static int cdns_torrent_dp_init(struct phy *phy);
-static void cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy);
+static int cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy);
static
-void cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy);
+int cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy);
static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy);
static
void cdns_torrent_dp_pma_cmn_cfg_25mhz(struct cdns_torrent_phy *cdns_phy);
@@ -158,9 +166,46 @@ static u32 cdns_torrent_dp_read(struct cdns_torrent_phy *cdns_phy, u32 offset)
readl_poll_timeout((cdns_phy)->base + (offset), \
val, cond, delay_us, timeout_us)

+/* Set power state A0 and PLL clock enable to 0 on enabled lanes. */
+static void cdns_torrent_dp_set_a0_pll(struct cdns_torrent_phy *cdns_phy,
+ u32 num_lanes)
+{
+ u32 pwr_state = cdns_torrent_dp_read(cdns_phy,
+ PHY_PMA_XCVR_POWER_STATE_REQ);
+ u32 pll_clk_en = cdns_torrent_dp_read(cdns_phy,
+ PHY_PMA_XCVR_PLLCLK_EN);
+
+ /* Lane 0 is always enabled. */
+ pwr_state &= ~(PMA_XCVR_POWER_STATE_REQ_LN_MASK <<
+ PHY_POWER_STATE_LN_0);
+ pll_clk_en &= ~0x01U;
+
+ if (num_lanes > 1) {
+ /* lane 1 */
+ pwr_state &= ~(PMA_XCVR_POWER_STATE_REQ_LN_MASK <<
+ PHY_POWER_STATE_LN_1);
+ pll_clk_en &= ~(0x01U << 1);
+ }
+
+ if (num_lanes > 2) {
+ /* lanes 2 and 3 */
+ pwr_state &= ~(PMA_XCVR_POWER_STATE_REQ_LN_MASK <<
+ PHY_POWER_STATE_LN_2);
+ pwr_state &= ~(PMA_XCVR_POWER_STATE_REQ_LN_MASK <<
+ PHY_POWER_STATE_LN_3);
+ pll_clk_en &= ~(0x01U << 2);
+ pll_clk_en &= ~(0x01U << 3);
+ }
+
+ cdns_torrent_dp_write(cdns_phy,
+ PHY_PMA_XCVR_POWER_STATE_REQ, pwr_state);
+ cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_PLLCLK_EN, pll_clk_en);
+}
+
static int cdns_torrent_dp_init(struct phy *phy)
{
unsigned char lane_bits;
+ int ret;

struct cdns_torrent_phy *cdns_phy = phy_get_drvdata(phy);

@@ -173,40 +218,7 @@ static int cdns_torrent_dp_init(struct phy *phy)
* Set lines power state to A0
* Set lines pll clk enable to 0
*/
-
- cdns_dp_phy_write_field(cdns_phy, PHY_PMA_XCVR_POWER_STATE_REQ,
- PHY_POWER_STATE_LN_0, 6, 0x0000);
-
- if (cdns_phy->num_lanes >= 2) {
- cdns_dp_phy_write_field(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_REQ,
- PHY_POWER_STATE_LN_1, 6, 0x0000);
-
- if (cdns_phy->num_lanes == 4) {
- cdns_dp_phy_write_field(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_REQ,
- PHY_POWER_STATE_LN_2, 6, 0);
- cdns_dp_phy_write_field(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_REQ,
- PHY_POWER_STATE_LN_3, 6, 0);
- }
- }
-
- cdns_dp_phy_write_field(cdns_phy, PHY_PMA_XCVR_PLLCLK_EN,
- 0, 1, 0x0000);
-
- if (cdns_phy->num_lanes >= 2) {
- cdns_dp_phy_write_field(cdns_phy, PHY_PMA_XCVR_PLLCLK_EN,
- 1, 1, 0x0000);
- if (cdns_phy->num_lanes == 4) {
- cdns_dp_phy_write_field(cdns_phy,
- PHY_PMA_XCVR_PLLCLK_EN,
- 2, 1, 0x0000);
- cdns_dp_phy_write_field(cdns_phy,
- PHY_PMA_XCVR_PLLCLK_EN,
- 3, 1, 0x0000);
- }
- }
+ cdns_torrent_dp_set_a0_pll(cdns_phy, cdns_phy->num_lanes);

/*
* release phy_l0*_reset_n and pma_tx_elec_idle_ln_* based on
@@ -225,23 +237,31 @@ static int cdns_torrent_dp_init(struct phy *phy)

/* take out of reset */
cdns_dp_phy_write_field(cdns_phy, PHY_RESET, 8, 1, 1);
- cdns_torrent_dp_wait_pma_cmn_ready(cdns_phy);
- cdns_torrent_dp_run(cdns_phy);
+ ret = cdns_torrent_dp_wait_pma_cmn_ready(cdns_phy);
+ if (ret)
+ return ret;

- return 0;
+ ret = cdns_torrent_dp_run(cdns_phy);
+
+ return ret;
}

static
-void cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy)
+int cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy)
{
unsigned int reg;
int ret;

ret = cdns_torrent_dp_read_poll_timeout(cdns_phy, PHY_PMA_CMN_READY,
- reg, reg & 1, 0, 500);
- if (ret == -ETIMEDOUT)
+ reg, reg & 1, 0,
+ POLL_TIMEOUT_US);
+ if (ret == -ETIMEDOUT) {
dev_err(cdns_phy->dev,
"timeout waiting for PMA common ready\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
}

static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy)
@@ -397,12 +417,73 @@ static void cdns_torrent_dp_pma_lane_cfg(struct cdns_torrent_phy *cdns_phy,
(XCVR_DIAG_HSCLK_SEL | lane_bits), 0x0000);
}

-static void cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy)
+static int cdns_torrent_dp_set_power_state(struct cdns_torrent_phy *cdns_phy,
+ u32 num_lanes,
+ enum phy_powerstate powerstate)
+{
+ /* Register value for power state for a single byte. */
+ u32 value_part;
+ u32 value;
+ u32 mask;
+ u32 read_val;
+ u32 ret;
+
+ switch (powerstate) {
+ case (POWERSTATE_A0):
+ value_part = 0x01U;
+ break;
+ case (POWERSTATE_A2):
+ value_part = 0x04U;
+ break;
+ default:
+ /* Powerstate A3 */
+ value_part = 0x08U;
+ break;
+ }
+
+ /* Select values of registers and mask, depending on enabled
+ * lane count.
+ */
+ switch (num_lanes) {
+ /* lane 0 */
+ case (1):
+ value = value_part;
+ mask = 0x0000003FU;
+ break;
+ /* lanes 0-1 */
+ case (2):
+ value = (value_part
+ | (value_part << 8));
+ mask = 0x00003F3FU;
+ break;
+ /* lanes 0-3, all */
+ default:
+ value = (value_part
+ | (value_part << 8)
+ | (value_part << 16)
+ | (value_part << 24));
+ mask = 0x3F3F3F3FU;
+ break;
+ }
+
+ /* Set power state A<n>. */
+ cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_POWER_STATE_REQ, value);
+ /* Wait, until PHY acknowledges power state completion. */
+ ret = cdns_torrent_dp_read_poll_timeout(cdns_phy,
+ PHY_PMA_XCVR_POWER_STATE_ACK,
+ read_val,
+ (read_val & mask) == value, 0,
+ POLL_TIMEOUT_US);
+ cdns_torrent_dp_write(cdns_phy,
+ PHY_PMA_XCVR_POWER_STATE_REQ, 0x00000000);
+ ndelay(100);
+
+ return ret;
+}
+
+static int cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy)
{
unsigned int read_val;
- u32 write_val1 = 0;
- u32 write_val2 = 0;
- u32 mask = 0;
int ret;

/*
@@ -413,60 +494,23 @@ static void cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy)
PHY_PMA_XCVR_PLLCLK_EN_ACK,
read_val, read_val & 1, 0,
POLL_TIMEOUT_US);
- if (ret == -ETIMEDOUT)
+ if (ret == -ETIMEDOUT) {
dev_err(cdns_phy->dev,
"timeout waiting for link PLL clock enable ack\n");
-
- ndelay(100);
-
- switch (cdns_phy->num_lanes) {
- case 1: /* lane 0 */
- write_val1 = 0x00000004;
- write_val2 = 0x00000001;
- mask = 0x0000003f;
- break;
- case 2: /* lane 0-1 */
- write_val1 = 0x00000404;
- write_val2 = 0x00000101;
- mask = 0x00003f3f;
- break;
- case 4: /* lane 0-3 */
- write_val1 = 0x04040404;
- write_val2 = 0x01010101;
- mask = 0x3f3f3f3f;
- break;
+ return ret;
}

- cdns_torrent_dp_write(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_REQ, write_val1);
-
- ret = cdns_torrent_dp_read_poll_timeout(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_ACK,
- read_val,
- (read_val & mask) == write_val1,
- 0, POLL_TIMEOUT_US);
-
- if (ret == -ETIMEDOUT)
- dev_err(cdns_phy->dev,
- "timeout waiting for link power state ack\n");
-
- cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_POWER_STATE_REQ, 0);
ndelay(100);

- cdns_torrent_dp_write(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_REQ, write_val2);
+ ret = cdns_torrent_dp_set_power_state(cdns_phy, cdns_phy->num_lanes,
+ POWERSTATE_A2);
+ if (ret)
+ return ret;

- ret = cdns_torrent_dp_read_poll_timeout(cdns_phy,
- PHY_PMA_XCVR_POWER_STATE_ACK,
- read_val,
- (read_val & mask) == write_val2,
- 0, POLL_TIMEOUT_US);
- if (ret == -ETIMEDOUT)
- dev_err(cdns_phy->dev,
- "timeout waiting for link power state ack\n");
+ ret = cdns_torrent_dp_set_power_state(cdns_phy, cdns_phy->num_lanes,
+ POWERSTATE_A0);

- cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_POWER_STATE_REQ, 0);
- ndelay(100);
+ return ret;
}

static void cdns_dp_phy_write_field(struct cdns_torrent_phy *cdns_phy,
--
2.7.4
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