On Tuesday, April 22, 2014 7:39 AM, Ajay Kumar wrote:
>
> This patch adds a drm_bridge driver for the PS8622 DisplayPort to LVDS
> bridge chip.
>
> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
> Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>
> ---
> Changes since V1:
> Pushing V1 for this as V2 because this patch holds good in this series.
>
> drivers/gpu/drm/bridge/Kconfig | 7 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/ps8622.c | 566 +++++++++++++++++++++++++++++++++++++++
> include/drm/bridge/ps8622.h | 42 +++
> 4 files changed, 616 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/ps8622.c
> create mode 100644 include/drm/bridge/ps8622.h
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 3bc6845..aba21fc 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -4,3 +4,10 @@ config DRM_PTN3460
> select DRM_KMS_HELPER
> select DRM_PANEL
> ---help---
> +
> +config DRM_PS8622
> + tristate "Parade eDP/LVDS bridge"
> + depends on DRM
> + select DRM_KMS_HELPER
> + select DRM_PANEL
Please add the following select.
+ select BACKLIGHT_LCD_SUPPORT
+ select BACKLIGHT_CLASS_DEVICE
Without this, the following build issues happen.
drivers/gpu/drm/bridge/ps8622.c:353: undefined reference to `backlight_device_unregister'
drivers/built-in.o: In function `ps8622_init':
drivers/gpu/drm/bridge/ps8622.c:559: undefined reference to `backlight_device_unregister'
drivers/gpu/drm/bridge/ps8622.c:507: undefined reference to `backlight_device_register'
> + ---help---
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index b4733e1..d1b5daa 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -1,3 +1,4 @@
> ccflags-y := -Iinclude/drm
>
> obj-$(CONFIG_DRM_PTN3460) += ptn3460.o
> +obj-$(CONFIG_DRM_PS8622) += ps8622.o
> diff --git a/drivers/gpu/drm/bridge/ps8622.c b/drivers/gpu/drm/bridge/ps8622.c
> new file mode 100644
> index 0000000..1e6b3ca
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/ps8622.c
[.....]
> +static int ps8622_send_config(struct ps8622_bridge *ps_bridge)
> +{
> + struct i2c_client *cl = ps_bridge->client;
> + int err = 0;
> +
> + /* wait 20ms after power ON */
> + usleep_range(20000, 30000);
> +
> + err |= ps8622_set(cl, 0x02, 0xa1, 0x01); /* HPD low */
> + /* SW setting */
> + err |= ps8622_set(cl, 0x04, 0x14, 0x01); /* [1:0] SW output 1.2V voltage
> + * is lower to 96% */
The comment style looks awkward.
Please choose one of two options. And change all comments in this file.
1.
+ /* SW setting */
+ err |= ps8622_set(cl, 0x04, 0x14, 0x01); /* [1:0] SW output 1.2V voltage is lower to 96% */
2.
+ /* SW setting */
+ /* [1:0] SW output 1.2V voltage is lower to 96% */
+ err |= ps8622_set(cl, 0x04, 0x14, 0x01);
> + /* RCO SS setting */
> + err |= ps8622_set(cl, 0x04, 0xe3, 0x20); /* [5:4] = b01 0.5%, b10 1%,
> + * b11 1.5% */
> + err |= ps8622_set(cl, 0x04, 0xe2, 0x80); /* [7] RCO SS enable */
> + /* RPHY Setting */
> + err |= ps8622_set(cl, 0x04, 0x8a, 0x0c); /* [3:2] CDR tune wait cycle
> + * before measure for fine tune
> + * b00: 1us b01: 0.5us b10:2us
> + * b11: 4us */
> + err |= ps8622_set(cl, 0x04, 0x89, 0x08); /* [3] RFD always on */
> + err |= ps8622_set(cl, 0x04, 0x71, 0x2d); /* CTN lock in/out:
> + * 20000ppm/80000ppm.
> + * Lock out 2 times. */
> + /* 2.7G CDR settings */
> + err |= ps8622_set(cl, 0x04, 0x7d, 0x07); /* NOF=40LSB for HBR CDR
> + * setting */
> + err |= ps8622_set(cl, 0x04, 0x7b, 0x00); /* [1:0] Fmin=+4bands */
> + err |= ps8622_set(cl, 0x04, 0x7a, 0xfd); /* [7:5] DCO_FTRNG=+-40% */
> + /* 1.62G CDR settings */
> + err |= ps8622_set(cl, 0x04, 0xc0, 0x12); /* [5:2]NOF=64LSB [1:0]DCO
> + * scale is 2/5 */
> + err |= ps8622_set(cl, 0x04, 0xc1, 0x92); /* Gitune=-37% */
> + err |= ps8622_set(cl, 0x04, 0xc2, 0x1c); /* Fbstep=100% */
> + err |= ps8622_set(cl, 0x04, 0x32, 0x80); /* [7] LOS signal disable */
> + /* RPIO Setting */
> + err |= ps8622_set(cl, 0x04, 0x00, 0xb0); /* [7:4] LVDS driver bias
> + * current : 75% (250mV swing)
> + * */
> + err |= ps8622_set(cl, 0x04, 0x15, 0x40); /* [7:6] Right-bar GPIO output
> + * strength is 8mA */
> + /* EQ Training State Machine Setting */
> + err |= ps8622_set(cl, 0x04, 0x54, 0x10); /* RCO calibration start */
> + /* Logic, needs more than 10 I2C command */
> + err |= ps8622_set(cl, 0x01, 0x02, 0x80 | ps_bridge->max_lane_count);
> + /* [4:0] MAX_LANE_COUNT set to
> + * max supported lanes */
> + err |= ps8622_set(cl, 0x01, 0x21, 0x80 | ps_bridge->lane_count);
> + /* [4:0] LANE_COUNT_SET set to
> + * chosen lane count */
> + err |= ps8622_set(cl, 0x00, 0x52, 0x20);
> + err |= ps8622_set(cl, 0x00, 0xf1, 0x03); /* HPD CP toggle enable */
> + err |= ps8622_set(cl, 0x00, 0x62, 0x41);
> + err |= ps8622_set(cl, 0x00, 0xf6, 0x01); /* Counter number, add 1ms
> + * counter delay */
> + err |= ps8622_set(cl, 0x00, 0x77, 0x06); /* [6]PWM function control by
> + * DPCD0040f[7], default is PWM
> + * block always works. */
> + err |= ps8622_set(cl, 0x00, 0x4c, 0x04); /* 04h Adjust VTotal tolerance
> + * to fix the 30Hz no display
> + * issue */
> + err |= ps8622_set(cl, 0x01, 0xc0, 0x00); /* DPCD00400='h00, Parade OUI =
> + * 'h001cf8 */
> + err |= ps8622_set(cl, 0x01, 0xc1, 0x1c); /* DPCD00401='h1c */
> + err |= ps8622_set(cl, 0x01, 0xc2, 0xf8); /* DPCD00402='hf8 */
> + err |= ps8622_set(cl, 0x01, 0xc3, 0x44); /* DPCD403~408 = ASCII code
> + * D2SLV5='h4432534c5635 */
> + err |= ps8622_set(cl, 0x01, 0xc4, 0x32); /* DPCD404 */
> + err |= ps8622_set(cl, 0x01, 0xc5, 0x53); /* DPCD405 */
> + err |= ps8622_set(cl, 0x01, 0xc6, 0x4c); /* DPCD406 */
> + err |= ps8622_set(cl, 0x01, 0xc7, 0x56); /* DPCD407 */
> + err |= ps8622_set(cl, 0x01, 0xc8, 0x35); /* DPCD408 */
> + err |= ps8622_set(cl, 0x01, 0xca, 0x01); /* DPCD40A, Initial Code major
> + * revision '01' */
> + err |= ps8622_set(cl, 0x01, 0xcb, 0x05); /* DPCD40B, Initial Code minor
> + * revision '05' */
> + if (ps_bridge->bl) {
> + err |= ps8622_set(cl, 0x01, 0xa5, 0xa0);
> + /* DPCD720, internal PWM */
> + err |= ps8622_set(cl, 0x01, 0xa7,
> + ps_bridge->bl->props.brightness);
> + /* FFh for 100% brightness,
> + * 0h for 0% brightness */
> + } else {
> + err |= ps8622_set(cl, 0x01, 0xa5, 0x80);
> + /* DPCD720, external PWM */
> + }
> + err |= ps8622_set(cl, 0x01, 0xcc, 0x13); /* Set LVDS output as 6bit-VESA
> + * mapping, single LVDS channel
> + * */
> + err |= ps8622_set(cl, 0x02, 0xb1, 0x20); /* Enable SSC set by register
> + * */
> + err |= ps8622_set(cl, 0x04, 0x10, 0x16); /* Set SSC enabled and +/-1%
> + * central spreading */
> + /* Logic end */
> + err |= ps8622_set(cl, 0x04, 0x59, 0x60); /* MPU Clock source: LC => RCO
> + * */
> + err |= ps8622_set(cl, 0x04, 0x54, 0x14); /* LC -> RCO */
> + err |= ps8622_set(cl, 0x02, 0xa1, 0x91); /* HPD high */
> +
> + return err ? -EIO : 0;
> +}
> +
[.....]
> +
> +static void ps8622_pre_enable(struct drm_bridge *bridge)
> +{
> + struct ps8622_bridge *ps_bridge = bridge->driver_private;
> + int ret;
> +
> + mutex_lock(&ps_bridge->enable_mutex);
> + if (ps_bridge->enabled)
> + goto out;
> +
> + if (gpio_is_valid(ps_bridge->gpio_rst_n))
> + gpio_set_value(ps_bridge->gpio_rst_n, 0);
> +
> + if (ps_bridge->v12) {
> + ret = regulator_enable(ps_bridge->v12);
> + if (ret)
> + DRM_ERROR("fails to enable ps_bridge->v12");
> + }
> +
> + drm_panel_pre_enable(ps_bridge->panel);
> +
> + if (gpio_is_valid(ps_bridge->gpio_slp_n))
> + gpio_set_value(ps_bridge->gpio_slp_n, 1);
> +
> + /*
> + * T1 is the range of time that it takes for the power to rise after we
> + * enable the lcd fet. T2 is the range of time in which the data sheet
> + * specifies we should deassert the reset pin.
> + *
> + * If it takes T1.max for the power to rise, we need to wait atleast
> + * T2.min before deasserting the reset pin. If it takes T1.min for the
> + * power to rise, we need to wait at most T2.max before deasserting the
> + * reset pin.
> + */
> + usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
> + PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
> +
> + if (gpio_is_valid(ps_bridge->gpio_rst_n))
> + gpio_set_value(ps_bridge->gpio_rst_n, 1);
> +
> + ret = ps8622_send_config(ps_bridge);
> + if (ret)
> + DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
> +
> + ps_bridge->enabled = true;
> +
> + mutex_unlock(&ps_bridge->enable_mutex);
> + return;
> +
> +out:
> +
> + mutex_unlock(&ps_bridge->enable_mutex);
> +}
mutex_unlock() is duplicated. Also, 'return' is unnecessary.
Please fix it as below.
+ ps_bridge->enabled = true;
+
+out:
+ mutex_unlock(&ps_bridge->enable_mutex);
+}
> +
> +static void ps8622_enable(struct drm_bridge *bridge)
> +{
> + struct ps8622_bridge *ps_bridge = bridge->driver_private;
> +
> + mutex_lock(&ps_bridge->enable_mutex);
> + if (ps_bridge->enabled)
> + drm_panel_enable(ps_bridge->panel);
> + mutex_unlock(&ps_bridge->enable_mutex);
> +}
> +
> +static void ps8622_disable(struct drm_bridge *bridge)
> +{
> + struct ps8622_bridge *ps_bridge = bridge->driver_private;
> +
> + mutex_lock(&ps_bridge->enable_mutex);
> +
> + if (!ps_bridge->enabled)
> + goto out;
> +
> + ps_bridge->enabled = false;
> +
> + drm_panel_disable(ps_bridge->panel);
> + msleep(PS8622_PWMO_END_T12_MS);
> +
> + /*
> + * This doesn't matter if the regulators are turned off, but something
> + * else might keep them on. In that case, we want to assert the slp gpio
> + * to lower power.
> + */
> + if (gpio_is_valid(ps_bridge->gpio_slp_n))
> + gpio_set_value(ps_bridge->gpio_slp_n, 0);
> +
> + drm_panel_post_disable(ps_bridge->panel);
> + if (ps_bridge->v12)
> + regulator_disable(ps_bridge->v12);
> +
> + /*
> + * Sleep for at least the amount of time that it takes the power rail to
> + * fall to prevent asserting the rst gpio from doing anything.
> + */
> + usleep_range(PS8622_POWER_FALL_T16_MAX_US,
> + 2 * PS8622_POWER_FALL_T16_MAX_US);
> + if (gpio_is_valid(ps_bridge->gpio_rst_n))
> + gpio_set_value(ps_bridge->gpio_rst_n, 0);
> +
> + msleep(PS8622_POWER_OFF_T17_MS);
> +
> +out:
> + mutex_unlock(&ps_bridge->enable_mutex);
> +}
> +
> +static void ps8622_post_disable(struct drm_bridge *bridge)
> +{
> +}
How about just removing this empty function?
[.....]
Best regards,
Jingoo Han
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