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drm/exynos: dsi: add driver data to support Exynos5410/5420/5440 SoCs
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The offset of register DSIM_PLLTMR_REG in Exynos5410 / 5420 / 5440
SoCs is different from the one in Exynos4 SoCs.

In case of Exynos5410 / 5420 / 5440 SoCs, there is no frequency
band bit in DSIM_PLLCTRL_REG, and it uses DSIM_PHYCTRL_REG and
DSIM_PHYTIMING*_REG instead.
So this patch adds driver data to distinguish it.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
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YoungJun Cho authored and Inki Dae committed Aug 3, 2014
1 parent 88dc66c commit 9a32041
Showing 1 changed file with 135 additions and 22 deletions.
157 changes: 135 additions & 22 deletions drivers/gpu/drm/exynos/exynos_drm_dsi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/phy/phy.h>
#include <linux/regulator/consumer.h>
Expand Down Expand Up @@ -57,9 +58,12 @@

/* FIFO memory AC characteristic register */
#define DSIM_PLLCTRL_REG 0x4c /* PLL control register */
#define DSIM_PLLTMR_REG 0x50 /* PLL timer register */
#define DSIM_PHYACCHR_REG 0x54 /* D-PHY AC characteristic register */
#define DSIM_PHYACCHR1_REG 0x58 /* D-PHY AC characteristic register1 */
#define DSIM_PHYCTRL_REG 0x5c
#define DSIM_PHYTIMING_REG 0x64
#define DSIM_PHYTIMING1_REG 0x68
#define DSIM_PHYTIMING2_REG 0x6c

/* DSIM_STATUS */
#define DSIM_STOP_STATE_DAT(x) (((x) & 0xf) << 0)
Expand Down Expand Up @@ -203,6 +207,24 @@
#define DSIM_PLL_M(x) ((x) << 4)
#define DSIM_PLL_S(x) ((x) << 1)

/* DSIM_PHYCTRL */
#define DSIM_PHYCTRL_ULPS_EXIT(x) (((x) & 0x1ff) << 0)

/* DSIM_PHYTIMING */
#define DSIM_PHYTIMING_LPX(x) ((x) << 8)
#define DSIM_PHYTIMING_HS_EXIT(x) ((x) << 0)

/* DSIM_PHYTIMING1 */
#define DSIM_PHYTIMING1_CLK_PREPARE(x) ((x) << 24)
#define DSIM_PHYTIMING1_CLK_ZERO(x) ((x) << 16)
#define DSIM_PHYTIMING1_CLK_POST(x) ((x) << 8)
#define DSIM_PHYTIMING1_CLK_TRAIL(x) ((x) << 0)

/* DSIM_PHYTIMING2 */
#define DSIM_PHYTIMING2_HS_PREPARE(x) ((x) << 16)
#define DSIM_PHYTIMING2_HS_ZERO(x) ((x) << 8)
#define DSIM_PHYTIMING2_HS_TRAIL(x) ((x) << 0)

#define DSI_MAX_BUS_WIDTH 4
#define DSI_NUM_VIRTUAL_CHANNELS 4
#define DSI_TX_FIFO_SIZE 2048
Expand Down Expand Up @@ -236,6 +258,12 @@ struct exynos_dsi_transfer {
#define DSIM_STATE_INITIALIZED BIT(1)
#define DSIM_STATE_CMD_LPM BIT(2)

struct exynos_dsi_driver_data {
unsigned int plltmr_reg;

unsigned int has_freqband:1;
};

struct exynos_dsi {
struct mipi_dsi_host dsi_host;
struct drm_connector connector;
Expand Down Expand Up @@ -266,11 +294,39 @@ struct exynos_dsi {

spinlock_t transfer_lock; /* protects transfer_list */
struct list_head transfer_list;

struct exynos_dsi_driver_data *driver_data;
};

#define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector)

static struct exynos_dsi_driver_data exynos4_dsi_driver_data = {
.plltmr_reg = 0x50,
.has_freqband = 1,
};

static struct exynos_dsi_driver_data exynos5_dsi_driver_data = {
.plltmr_reg = 0x58,
};

static struct of_device_id exynos_dsi_of_match[] = {
{ .compatible = "samsung,exynos4210-mipi-dsi",
.data = &exynos4_dsi_driver_data },
{ .compatible = "samsung,exynos5410-mipi-dsi",
.data = &exynos5_dsi_driver_data },
{ }
};

static inline struct exynos_dsi_driver_data *exynos_dsi_get_driver_data(
struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(exynos_dsi_of_match, &pdev->dev);

return (struct exynos_dsi_driver_data *)of_id->data;
}

static void exynos_dsi_wait_for_reset(struct exynos_dsi *dsi)
{
if (wait_for_completion_timeout(&dsi->completed, msecs_to_jiffies(300)))
Expand Down Expand Up @@ -344,14 +400,9 @@ static unsigned long exynos_dsi_pll_find_pms(struct exynos_dsi *dsi,
static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi,
unsigned long freq)
{
static const unsigned long freq_bands[] = {
100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ,
270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ,
510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ,
770 * MHZ, 870 * MHZ, 950 * MHZ,
};
struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
unsigned long fin, fout;
int timeout, band;
int timeout;
u8 p, s;
u16 m;
u32 reg;
Expand All @@ -372,18 +423,30 @@ static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi,
"failed to find PLL PMS for requested frequency\n");
return -EFAULT;
}
dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d)\n", fout, p, m, s);

for (band = 0; band < ARRAY_SIZE(freq_bands); ++band)
if (fout < freq_bands[band])
break;
writel(500, dsi->reg_base + driver_data->plltmr_reg);

reg = DSIM_PLL_EN | DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s);

if (driver_data->has_freqband) {
static const unsigned long freq_bands[] = {
100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ,
270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ,
510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ,
770 * MHZ, 870 * MHZ, 950 * MHZ,
};
int band;

dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d), band %d\n", fout,
p, m, s, band);
for (band = 0; band < ARRAY_SIZE(freq_bands); ++band)
if (fout < freq_bands[band])
break;

writel(500, dsi->reg_base + DSIM_PLLTMR_REG);
dev_dbg(dsi->dev, "band %d\n", band);

reg |= DSIM_FREQ_BAND(band);
}

reg = DSIM_FREQ_BAND(band) | DSIM_PLL_EN
| DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s);
writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG);

timeout = 1000;
Expand Down Expand Up @@ -437,6 +500,59 @@ static int exynos_dsi_enable_clock(struct exynos_dsi *dsi)
return 0;
}

static void exynos_dsi_set_phy_ctrl(struct exynos_dsi *dsi)
{
struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
u32 reg;

if (driver_data->has_freqband)
return;

/* B D-PHY: D-PHY Master & Slave Analog Block control */
reg = DSIM_PHYCTRL_ULPS_EXIT(0x0af);
writel(reg, dsi->reg_base + DSIM_PHYCTRL_REG);

/*
* T LPX: Transmitted length of any Low-Power state period
* T HS-EXIT: Time that the transmitter drives LP-11 following a HS
* burst
*/
reg = DSIM_PHYTIMING_LPX(0x06) | DSIM_PHYTIMING_HS_EXIT(0x0b);
writel(reg, dsi->reg_base + DSIM_PHYTIMING_REG);

/*
* T CLK-PREPARE: Time that the transmitter drives the Clock Lane LP-00
* Line state immediately before the HS-0 Line state starting the
* HS transmission
* T CLK-ZERO: Time that the transmitter drives the HS-0 state prior to
* transmitting the Clock.
* T CLK_POST: Time that the transmitter continues to send HS clock
* after the last associated Data Lane has transitioned to LP Mode
* Interval is defined as the period from the end of T HS-TRAIL to
* the beginning of T CLK-TRAIL
* T CLK-TRAIL: Time that the transmitter drives the HS-0 state after
* the last payload clock bit of a HS transmission burst
*/
reg = DSIM_PHYTIMING1_CLK_PREPARE(0x07) |
DSIM_PHYTIMING1_CLK_ZERO(0x27) |
DSIM_PHYTIMING1_CLK_POST(0x0d) |
DSIM_PHYTIMING1_CLK_TRAIL(0x08);
writel(reg, dsi->reg_base + DSIM_PHYTIMING1_REG);

/*
* T HS-PREPARE: Time that the transmitter drives the Data Lane LP-00
* Line state immediately before the HS-0 Line state starting the
* HS transmission
* T HS-ZERO: Time that the transmitter drives the HS-0 state prior to
* transmitting the Sync sequence.
* T HS-TRAIL: Time that the transmitter drives the flipped differential
* state after last payload data bit of a HS transmission burst
*/
reg = DSIM_PHYTIMING2_HS_PREPARE(0x09) | DSIM_PHYTIMING2_HS_ZERO(0x0d) |
DSIM_PHYTIMING2_HS_TRAIL(0x0b);
writel(reg, dsi->reg_base + DSIM_PHYTIMING2_REG);
}

static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
{
u32 reg;
Expand Down Expand Up @@ -987,10 +1103,11 @@ static void exynos_dsi_disable_irq(struct exynos_dsi *dsi)

static int exynos_dsi_init(struct exynos_dsi *dsi)
{
exynos_dsi_enable_clock(dsi);
exynos_dsi_reset(dsi);
exynos_dsi_enable_irq(dsi);
exynos_dsi_enable_clock(dsi);
exynos_dsi_wait_for_reset(dsi);
exynos_dsi_set_phy_ctrl(dsi);
exynos_dsi_init_link(dsi);

return 0;
Expand Down Expand Up @@ -1547,6 +1664,7 @@ static int exynos_dsi_probe(struct platform_device *pdev)
dsi->dsi_host.dev = &pdev->dev;

dsi->dev = &pdev->dev;
dsi->driver_data = exynos_dsi_get_driver_data(pdev);

ret = exynos_dsi_parse_dt(dsi);
if (ret)
Expand Down Expand Up @@ -1629,11 +1747,6 @@ static int exynos_dsi_remove(struct platform_device *pdev)
return 0;
}

static struct of_device_id exynos_dsi_of_match[] = {
{ .compatible = "samsung,exynos4210-mipi-dsi" },
{ }
};

struct platform_driver dsi_driver = {
.probe = exynos_dsi_probe,
.remove = exynos_dsi_remove,
Expand Down

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