Commit c25c0136 authored by Laurent Pinchart's avatar Laurent Pinchart
Browse files

drm: rcar-du: lvds: D3/E3 support



The LVDS encoders in the D3 and E3 SoCs differ significantly from those
in the other R-Car Gen3 family members:

- The LVDS PLL architecture is more complex and requires computing PLL
  parameters manually.
- The PLL uses external clocks as inputs, which need to be retrieved
  from DT.
- In addition to the different PLL setup, the startup sequence has
  changed *again* (seems someone had trouble making his/her mind).

Supporting all this requires DT bindings extensions for external clocks,
brand new PLL setup code, and a few quirks to handle the differences in
the startup sequence.

The implementation doesn't support all hardware features yet, namely

- Using the LV[01] clocks generated by the CPG as PLL input.
- Providing the LVDS PLL clock to the DU for use with the RGB output.

Those features can be added later when the need will arise.
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: default avatarJacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: default avatarUlrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: default avatarJacopo Mondi <jacopo+renesas@jmondi.org>
parent 399d9f2f
......@@ -24,6 +24,8 @@
#include "rcar_lvds_regs.h"
struct rcar_lvds;
/* Keep in sync with the LVDCR0.LVMD hardware register values. */
enum rcar_lvds_mode {
RCAR_LVDS_MODE_JEIDA = 0,
......@@ -31,14 +33,16 @@ enum rcar_lvds_mode {
RCAR_LVDS_MODE_VESA = 4,
};
#define RCAR_LVDS_QUIRK_LANES (1 << 0) /* LVDS lanes 1 and 3 inverted */
#define RCAR_LVDS_QUIRK_GEN2_PLLCR (1 << 1) /* LVDPLLCR has gen2 layout */
#define RCAR_LVDS_QUIRK_GEN3_LVEN (1 << 2) /* LVEN bit needs to be set */
/* on R8A77970/R8A7799x */
#define RCAR_LVDS_QUIRK_LANES BIT(0) /* LVDS lanes 1 and 3 inverted */
#define RCAR_LVDS_QUIRK_GEN3_LVEN BIT(1) /* LVEN bit needs to be set on R8A77970/R8A7799x */
#define RCAR_LVDS_QUIRK_PWD BIT(2) /* PWD bit available (all of Gen3 but E3) */
#define RCAR_LVDS_QUIRK_EXT_PLL BIT(3) /* Has extended PLL */
#define RCAR_LVDS_QUIRK_DUAL_LINK BIT(4) /* Supports dual-link operation */
struct rcar_lvds_device_info {
unsigned int gen;
unsigned int quirks;
void (*pll_setup)(struct rcar_lvds *lvds, unsigned int freq);
};
struct rcar_lvds {
......@@ -52,7 +56,11 @@ struct rcar_lvds {
struct drm_panel *panel;
void __iomem *mmio;
struct clk *clock;
struct {
struct clk *mod; /* CPG module clock */
struct clk *extal; /* External clock */
struct clk *dotclkin[2]; /* External DU clocks */
} clocks;
bool enabled;
struct drm_display_mode display_mode;
......@@ -128,33 +136,216 @@ static const struct drm_connector_funcs rcar_lvds_conn_funcs = {
};
/* -----------------------------------------------------------------------------
* Bridge
* PLL Setup
*/
static u32 rcar_lvds_lvdpllcr_gen2(unsigned int freq)
static void rcar_lvds_pll_setup_gen2(struct rcar_lvds *lvds, unsigned int freq)
{
if (freq < 39000)
return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_38M;
else if (freq < 61000)
return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_60M;
else if (freq < 121000)
return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_121M;
u32 val;
if (freq < 39000000)
val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_38M;
else if (freq < 61000000)
val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_60M;
else if (freq < 121000000)
val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_121M;
else
return LVDPLLCR_PLLDLYCNT_150M;
val = LVDPLLCR_PLLDLYCNT_150M;
rcar_lvds_write(lvds, LVDPLLCR, val);
}
static u32 rcar_lvds_lvdpllcr_gen3(unsigned int freq)
static void rcar_lvds_pll_setup_gen3(struct rcar_lvds *lvds, unsigned int freq)
{
if (freq < 42000)
return LVDPLLCR_PLLDIVCNT_42M;
else if (freq < 85000)
return LVDPLLCR_PLLDIVCNT_85M;
else if (freq < 128000)
return LVDPLLCR_PLLDIVCNT_128M;
u32 val;
if (freq < 42000000)
val = LVDPLLCR_PLLDIVCNT_42M;
else if (freq < 85000000)
val = LVDPLLCR_PLLDIVCNT_85M;
else if (freq < 128000000)
val = LVDPLLCR_PLLDIVCNT_128M;
else
return LVDPLLCR_PLLDIVCNT_148M;
val = LVDPLLCR_PLLDIVCNT_148M;
rcar_lvds_write(lvds, LVDPLLCR, val);
}
struct pll_info {
unsigned long diff;
unsigned int pll_m;
unsigned int pll_n;
unsigned int pll_e;
unsigned int div;
u32 clksel;
};
static void rcar_lvds_d3_e3_pll_calc(struct rcar_lvds *lvds, struct clk *clk,
unsigned long target, struct pll_info *pll,
u32 clksel)
{
unsigned long output;
unsigned long fin;
unsigned int m_min;
unsigned int m_max;
unsigned int m;
int error;
if (!clk)
return;
/*
* The LVDS PLL is made of a pre-divider and a multiplier (strangely
* enough called M and N respectively), followed by a post-divider E.
*
* ,-----. ,-----. ,-----. ,-----.
* Fin --> | 1/M | -Fpdf-> | PFD | --> | VCO | -Fvco-> | 1/E | --> Fout
* `-----' ,-> | | `-----' | `-----'
* | `-----' |
* | ,-----. |
* `-------- | 1/N | <-------'
* `-----'
*
* The clock output by the PLL is then further divided by a programmable
* divider DIV to achieve the desired target frequency. Finally, an
* optional fixed /7 divider is used to convert the bit clock to a pixel
* clock (as LVDS transmits 7 bits per lane per clock sample).
*
* ,-------. ,-----. |\
* Fout --> | 1/DIV | --> | 1/7 | --> | |
* `-------' | `-----' | | --> dot clock
* `------------> | |
* |/
*
* The /7 divider is optional when the LVDS PLL is used to generate a
* dot clock for the DU RGB output, without using the LVDS encoder. We
* don't support this configuration yet.
*
* The PLL allowed input frequency range is 12 MHz to 192 MHz.
*/
fin = clk_get_rate(clk);
if (fin < 12000000 || fin > 192000000)
return;
/*
* The comparison frequency range is 12 MHz to 24 MHz, which limits the
* allowed values for the pre-divider M (normal range 1-8).
*
* Fpfd = Fin / M
*/
m_min = max_t(unsigned int, 1, DIV_ROUND_UP(fin, 24000000));
m_max = min_t(unsigned int, 8, fin / 12000000);
for (m = m_min; m <= m_max; ++m) {
unsigned long fpfd;
unsigned int n_min;
unsigned int n_max;
unsigned int n;
/*
* The VCO operating range is 900 Mhz to 1800 MHz, which limits
* the allowed values for the multiplier N (normal range
* 60-120).
*
* Fvco = Fin * N / M
*/
fpfd = fin / m;
n_min = max_t(unsigned int, 60, DIV_ROUND_UP(900000000, fpfd));
n_max = min_t(unsigned int, 120, 1800000000 / fpfd);
for (n = n_min; n < n_max; ++n) {
unsigned long fvco;
unsigned int e_min;
unsigned int e;
/*
* The output frequency is limited to 1039.5 MHz,
* limiting again the allowed values for the
* post-divider E (normal value 1, 2 or 4).
*
* Fout = Fvco / E
*/
fvco = fpfd * n;
e_min = fvco > 1039500000 ? 1 : 0;
for (e = e_min; e < 3; ++e) {
unsigned long fout;
unsigned long diff;
unsigned int div;
/*
* Finally we have a programable divider after
* the PLL, followed by a an optional fixed /7
* divider.
*/
fout = fvco / (1 << e) / 7;
div = DIV_ROUND_CLOSEST(fout, target);
diff = abs(fout / div - target);
if (diff < pll->diff) {
pll->diff = diff;
pll->pll_m = m;
pll->pll_n = n;
pll->pll_e = e;
pll->div = div;
pll->clksel = clksel;
if (diff == 0)
goto done;
}
}
}
}
done:
output = fin * pll->pll_n / pll->pll_m / (1 << pll->pll_e)
/ 7 / pll->div;
error = (long)(output - target) * 10000 / (long)target;
dev_dbg(lvds->dev,
"%pC %lu Hz -> Fout %lu Hz (target %lu Hz, error %d.%02u%%), PLL M/N/E/DIV %u/%u/%u/%u\n",
clk, fin, output, target, error / 100,
error < 0 ? -error % 100 : error % 100,
pll->pll_m, pll->pll_n, pll->pll_e, pll->div);
}
static void rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, unsigned int freq)
{
struct pll_info pll = { .diff = (unsigned long)-1 };
u32 lvdpllcr;
rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.dotclkin[0], freq, &pll,
LVDPLLCR_CKSEL_DU_DOTCLKIN(0));
rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.dotclkin[1], freq, &pll,
LVDPLLCR_CKSEL_DU_DOTCLKIN(1));
rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.extal, freq, &pll,
LVDPLLCR_CKSEL_EXTAL);
lvdpllcr = LVDPLLCR_PLLON | pll.clksel | LVDPLLCR_CLKOUT
| LVDPLLCR_PLLN(pll.pll_n - 1) | LVDPLLCR_PLLM(pll.pll_m - 1);
if (pll.pll_e > 0)
lvdpllcr |= LVDPLLCR_STP_CLKOUTE | LVDPLLCR_OUTCLKSEL
| LVDPLLCR_PLLE(pll.pll_e - 1);
rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr);
if (pll.div > 1)
/*
* The DIVRESET bit is a misnomer, setting it to 1 deasserts the
* divisor reset.
*/
rcar_lvds_write(lvds, LVDDIV, LVDDIV_DIVSEL |
LVDDIV_DIVRESET | LVDDIV_DIV(pll.div - 1));
else
rcar_lvds_write(lvds, LVDDIV, 0);
}
/* -----------------------------------------------------------------------------
* Bridge
*/
static void rcar_lvds_enable(struct drm_bridge *bridge)
{
struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
......@@ -164,14 +355,13 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
* do we get a state pointer?
*/
struct drm_crtc *crtc = lvds->bridge.encoder->crtc;
u32 lvdpllcr;
u32 lvdhcr;
u32 lvdcr0;
int ret;
WARN_ON(lvds->enabled);
ret = clk_prepare_enable(lvds->clock);
ret = clk_prepare_enable(lvds->clocks.mod);
if (ret < 0)
return;
......@@ -196,12 +386,13 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
rcar_lvds_write(lvds, LVDCHCR, lvdhcr);
if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) {
/* Disable dual-link mode. */
rcar_lvds_write(lvds, LVDSTRIPE, 0);
}
/* PLL clock configuration. */
if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN2_PLLCR)
lvdpllcr = rcar_lvds_lvdpllcr_gen2(mode->clock);
else
lvdpllcr = rcar_lvds_lvdpllcr_gen3(mode->clock);
rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr);
lvds->info->pll_setup(lvds, mode->clock * 1000);
/* Set the LVDS mode and select the input. */
lvdcr0 = lvds->mode << LVDCR0_LVMD_SHIFT;
......@@ -220,11 +411,16 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
}
/* Turn the PLL on. */
lvdcr0 |= LVDCR0_PLLON;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)) {
/*
* Turn the PLL on (simple PLL only, extended PLL is fully
* controlled through LVDPLLCR).
*/
lvdcr0 |= LVDCR0_PLLON;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
}
if (lvds->info->gen > 2) {
if (lvds->info->quirks & RCAR_LVDS_QUIRK_PWD) {
/* Set LVDS normal mode. */
lvdcr0 |= LVDCR0_PWD;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
......@@ -236,8 +432,10 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
}
/* Wait for the startup delay. */
usleep_range(100, 150);
if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)) {
/* Wait for the PLL startup delay (simple PLL only). */
usleep_range(100, 150);
}
/* Turn the output on. */
lvdcr0 |= LVDCR0_LVRES;
......@@ -264,8 +462,9 @@ static void rcar_lvds_disable(struct drm_bridge *bridge)
rcar_lvds_write(lvds, LVDCR0, 0);
rcar_lvds_write(lvds, LVDCR1, 0);
rcar_lvds_write(lvds, LVDPLLCR, 0);
clk_disable_unprepare(lvds->clock);
clk_disable_unprepare(lvds->clocks.mod);
lvds->enabled = false;
}
......@@ -446,6 +645,60 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
return ret;
}
static struct clk *rcar_lvds_get_clock(struct rcar_lvds *lvds, const char *name,
bool optional)
{
struct clk *clk;
clk = devm_clk_get(lvds->dev, name);
if (!IS_ERR(clk))
return clk;
if (PTR_ERR(clk) == -ENOENT && optional)
return NULL;
if (PTR_ERR(clk) != -EPROBE_DEFER)
dev_err(lvds->dev, "failed to get %s clock\n",
name ? name : "module");
return clk;
}
static int rcar_lvds_get_clocks(struct rcar_lvds *lvds)
{
lvds->clocks.mod = rcar_lvds_get_clock(lvds, NULL, false);
if (IS_ERR(lvds->clocks.mod))
return PTR_ERR(lvds->clocks.mod);
/*
* LVDS encoders without an extended PLL have no external clock inputs.
*/
if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL))
return 0;
lvds->clocks.extal = rcar_lvds_get_clock(lvds, "extal", true);
if (IS_ERR(lvds->clocks.extal))
return PTR_ERR(lvds->clocks.extal);
lvds->clocks.dotclkin[0] = rcar_lvds_get_clock(lvds, "dclkin.0", true);
if (IS_ERR(lvds->clocks.dotclkin[0]))
return PTR_ERR(lvds->clocks.dotclkin[0]);
lvds->clocks.dotclkin[1] = rcar_lvds_get_clock(lvds, "dclkin.1", true);
if (IS_ERR(lvds->clocks.dotclkin[1]))
return PTR_ERR(lvds->clocks.dotclkin[1]);
/* At least one input to the PLL must be available. */
if (!lvds->clocks.extal && !lvds->clocks.dotclkin[0] &&
!lvds->clocks.dotclkin[1]) {
dev_err(lvds->dev,
"no input clock (extal, dclkin.0 or dclkin.1)\n");
return -EINVAL;
}
return 0;
}
static int rcar_lvds_probe(struct platform_device *pdev)
{
struct rcar_lvds *lvds;
......@@ -475,11 +728,9 @@ static int rcar_lvds_probe(struct platform_device *pdev)
if (IS_ERR(lvds->mmio))
return PTR_ERR(lvds->mmio);
lvds->clock = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(lvds->clock)) {
dev_err(&pdev->dev, "failed to get clock\n");
return PTR_ERR(lvds->clock);
}
ret = rcar_lvds_get_clocks(lvds);
if (ret < 0)
return ret;
drm_bridge_add(&lvds->bridge);
......@@ -497,21 +748,39 @@ static int rcar_lvds_remove(struct platform_device *pdev)
static const struct rcar_lvds_device_info rcar_lvds_gen2_info = {
.gen = 2,
.quirks = RCAR_LVDS_QUIRK_GEN2_PLLCR,
.pll_setup = rcar_lvds_pll_setup_gen2,
};
static const struct rcar_lvds_device_info rcar_lvds_r8a7790_info = {
.gen = 2,
.quirks = RCAR_LVDS_QUIRK_GEN2_PLLCR | RCAR_LVDS_QUIRK_LANES,
.quirks = RCAR_LVDS_QUIRK_LANES,
.pll_setup = rcar_lvds_pll_setup_gen2,
};
static const struct rcar_lvds_device_info rcar_lvds_gen3_info = {
.gen = 3,
.quirks = RCAR_LVDS_QUIRK_PWD,
.pll_setup = rcar_lvds_pll_setup_gen3,
};
static const struct rcar_lvds_device_info rcar_lvds_r8a77970_info = {
.gen = 3,
.quirks = RCAR_LVDS_QUIRK_GEN2_PLLCR | RCAR_LVDS_QUIRK_GEN3_LVEN,
.quirks = RCAR_LVDS_QUIRK_PWD | RCAR_LVDS_QUIRK_GEN3_LVEN,
.pll_setup = rcar_lvds_pll_setup_gen2,
};
static const struct rcar_lvds_device_info rcar_lvds_r8a77990_info = {
.gen = 3,
.quirks = RCAR_LVDS_QUIRK_GEN3_LVEN | RCAR_LVDS_QUIRK_EXT_PLL
| RCAR_LVDS_QUIRK_DUAL_LINK,
.pll_setup = rcar_lvds_pll_setup_d3_e3,
};
static const struct rcar_lvds_device_info rcar_lvds_r8a77995_info = {
.gen = 3,
.quirks = RCAR_LVDS_QUIRK_GEN3_LVEN | RCAR_LVDS_QUIRK_PWD
| RCAR_LVDS_QUIRK_EXT_PLL | RCAR_LVDS_QUIRK_DUAL_LINK,
.pll_setup = rcar_lvds_pll_setup_d3_e3,
};
static const struct of_device_id rcar_lvds_of_table[] = {
......@@ -523,6 +792,8 @@ static const struct of_device_id rcar_lvds_of_table[] = {
{ .compatible = "renesas,r8a7796-lvds", .data = &rcar_lvds_gen3_info },
{ .compatible = "renesas,r8a77970-lvds", .data = &rcar_lvds_r8a77970_info },
{ .compatible = "renesas,r8a77980-lvds", .data = &rcar_lvds_gen3_info },
{ .compatible = "renesas,r8a77990-lvds", .data = &rcar_lvds_r8a77990_info },
{ .compatible = "renesas,r8a77995-lvds", .data = &rcar_lvds_r8a77995_info },
{ }
};
......
......@@ -18,7 +18,7 @@
#define LVDCR0_PLLON (1 << 4)
#define LVDCR0_PWD (1 << 2) /* Gen3 only */
#define LVDCR0_BEN (1 << 2) /* Gen2 only */
#define LVDCR0_LVEN (1 << 1) /* Gen2 only */
#define LVDCR0_LVEN (1 << 1)
#define LVDCR0_LVRES (1 << 0)
#define LVDCR1 0x0004
......@@ -27,21 +27,36 @@
#define LVDCR1_CLKSTBY (3 << 0)
#define LVDPLLCR 0x0008
/* Gen2 & V3M */
#define LVDPLLCR_CEEN (1 << 14)
#define LVDPLLCR_FBEN (1 << 13)
#define LVDPLLCR_COSEL (1 << 12)
/* Gen2 */
#define LVDPLLCR_PLLDLYCNT_150M (0x1bf << 0)
#define LVDPLLCR_PLLDLYCNT_121M (0x22c << 0)
#define LVDPLLCR_PLLDLYCNT_60M (0x77b << 0)
#define LVDPLLCR_PLLDLYCNT_38M (0x69a << 0)
#define LVDPLLCR_PLLDLYCNT_MASK (0x7ff << 0)
/* Gen3 */
/* Gen3 but V3M,D3 and E3 */
#define LVDPLLCR_PLLDIVCNT_42M (0x014cb << 0)
#define LVDPLLCR_PLLDIVCNT_85M (0x00a45 << 0)
#define LVDPLLCR_PLLDIVCNT_128M (0x006c3 << 0)
#define LVDPLLCR_PLLDIVCNT_148M (0x046c1 << 0)
#define LVDPLLCR_PLLDIVCNT_MASK (0x7ffff << 0)
/* D3 and E3 */
#define LVDPLLCR_PLLON (1 << 22)
#define LVDPLLCR_PLLSEL_PLL0 (0 << 20)
#define LVDPLLCR_PLLSEL_LVX (1 << 20)
#define LVDPLLCR_PLLSEL_PLL1 (2 << 20)
#define LVDPLLCR_CKSEL_LVX (1 << 17)
#define LVDPLLCR_CKSEL_EXTAL (3 << 17)
#define LVDPLLCR_CKSEL_DU_DOTCLKIN(n) ((5 + (n) * 2) << 17)
#define LVDPLLCR_OCKSEL (1 << 16)
#define LVDPLLCR_STP_CLKOUTE (1 << 14)
#define LVDPLLCR_OUTCLKSEL (1 << 12)
#define LVDPLLCR_CLKOUT (1 << 11)
#define LVDPLLCR_PLLE(n) ((n) << 10)
#define LVDPLLCR_PLLN(n) ((n) << 3)
#define LVDPLLCR_PLLM(n) ((n) << 0)
#define LVDCTRCR 0x000c
#define LVDCTRCR_CTR3SEL_ZERO (0 << 12)
......@@ -71,4 +86,26 @@
#define LVDCHCR_CHSEL_CH(n, c) ((((c) - (n)) & 3) << ((n) * 4))
#define LVDCHCR_CHSEL_MASK(n) (3 << ((n) * 4))
/* All registers below are specific to D3 and E3 */
#define LVDSTRIPE 0x0014
#define LVDSTRIPE_ST_TRGSEL_DISP (0 << 2)
#define LVDSTRIPE_ST_TRGSEL_HSYNC_R (1 << 2)
#define LVDSTRIPE_ST_TRGSEL_HSYNC_F (2 << 2)
#define LVDSTRIPE_ST_SWAP (1 << 1)
#define LVDSTRIPE_ST_ON (1 << 0)
#define LVDSCR 0x0018
#define LVDSCR_DEPTH(n) (((n) - 1) << 29)
#define LVDSCR_BANDSET (1 << 28)
#define LVDSCR_TWGCNT(n) ((((n) - 256) / 16) << 24)
#define LVDSCR_SDIV(n) ((n) << 22)
#define LVDSCR_MODE (1 << 21)
#define LVDSCR_RSTN (1 << 20)
#define LVDDIV 0x001c
#define LVDDIV_DIVSEL (1 << 8)
#define LVDDIV_DIVRESET (1 << 7)
#define LVDDIV_DIVSTP (1 << 6)
#define LVDDIV_DIV(n) ((n) << 0)
#endif /* __RCAR_LVDS_REGS_H__ */
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