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drm/rockchip: tve: add support for parsing vdac_out_current from otp

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Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Change-Id: I1bfd7535adc36ff77b510a7e735de0bb0ad16c48
This commit is contained in:
Damon Ding
2023-02-22 18:06:53 +08:00
parent 7a94eacc84
commit 2cd49534fc
2 changed files with 52 additions and 1 deletions
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52
drivers/gpu/drm/rockchip/rockchip_drm_tve.c
View File

@@ -325,7 +325,7 @@ static void dac_enable(struct rockchip_tve *tve, bool enable)
msleep(20);
tve_dac_writel(VDAC_CLK_RST, v_ANALOG_RST(1) | v_DIGITAL_RST(1));
tve_dac_writel(VDAC_CURRENT_CTRL, v_OUT_CURRENT(0xd2));
tve_dac_writel(VDAC_CURRENT_CTRL, v_OUT_CURRENT(tve->vdac_out_current));
val = v_REF_VOLTAGE(7) | v_DAC_PWN(1) | v_BIAS_PWN(1);
offset = VDAC_PWM_REF_CTRL;
@@ -518,9 +518,34 @@ rockchip_tve_encoder_helper_funcs = {
.atomic_check = rockchip_tve_encoder_atomic_check,
};
static int tve_read_otp_by_name(struct rockchip_tve *tve, char *name, u8 *val, u8 default_val)
{
struct nvmem_cell *cell;
size_t len;
unsigned char *efuse_buf;
int ret = -EINVAL;
*val = default_val;
cell = nvmem_cell_get(tve->dev, name);
if (!IS_ERR(cell)) {
efuse_buf = nvmem_cell_read(cell, &len);
nvmem_cell_put(cell);
if (!IS_ERR(efuse_buf)) {
*val = efuse_buf[0];
kfree(efuse_buf);
return 0;
}
}
dev_err(tve->dev, "failed to read %s from otp, use default\n", name);
return ret;
}
static int tve_parse_dt(struct device_node *np, struct rockchip_tve *tve)
{
int ret, val;
u8 out_current, version;
ret = of_property_read_u32(np, "rockchip,tvemode", &val);
if (ret < 0) {
@@ -576,6 +601,31 @@ static int tve_parse_dt(struct device_node *np, struct rockchip_tve *tve)
return -EINVAL;
tve->upsample_mode = val;
/*
* Read vdac output current from OTP if exists, and the default
* current val is 0xd2.
*/
ret = tve_read_otp_by_name(tve, "out-current", &out_current, 0xd2);
if (!ret) {
if (out_current) {
/*
* If test version is 0x0, the value of vdac out current
* needs to be reduced by one.
*/
ret = tve_read_otp_by_name(tve, "version", &version, 0x0);
if (!ret) {
if (version == 0x0)
out_current -= 1;
}
} else {
/*
* If the current value read from OTP is 0, set it to default.
*/
out_current = 0xd2;
}
}
tve->vdac_out_current = out_current;
return 0;
}

1
drivers/gpu/drm/rockchip/rockchip_drm_tve.h
View File

@@ -277,6 +277,7 @@ struct rockchip_tve {
u32 daclevel;
u32 dac1level;
u32 preferred_mode;
u8 vdac_out_current;
struct mutex suspend_lock; /* mutex for tve resume operation*/
struct rockchip_drm_sub_dev sub_dev;
};