From ea0fe6725141788ec0bb5a1bcb68d136cb5c6970 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 16 Dec 2019 21:51:19 +0100 Subject: drm/i915/dsi: Move poking of panel-enable GPIO to intel_dsi_vbt.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On some older devices (BYT, CHT) which may use v2 VBT MIPI-sequences, we need to manually control the panel enable GPIO as v2 sequences do not do this. So far we have been carrying the code to do this on BYT/CHT devices with a Crystal Cove PMIC in vlv_dsi.c, but as this really is a shortcoming of the VBT MIPI-sequences, intel_dsi_vbt.c is a better place for this, so move it there. This is a preparation patch for adding panel-enable and backlight-enable GPIO support for BYT devices where instead of the PMIC the SoC is used for backlight control. Reviewed-by: Linus Walleij Reviewed-by: Ville Syrjälä Signed-off-by: Hans de Goede Link: https://patchwork.freedesktop.org/patch/msgid/20191216205122.1850923-3-hdegoede@redhat.com --- drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 46 ++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/i915/display/intel_dsi_vbt.c') diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c index f90946c912ee..8be7d6c507aa 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c @@ -453,8 +453,8 @@ static const char *sequence_name(enum mipi_seq seq_id) return "(unknown)"; } -void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi, - enum mipi_seq seq_id) +static void intel_dsi_vbt_exec(struct intel_dsi *intel_dsi, + enum mipi_seq seq_id) { struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev); const u8 *data; @@ -519,6 +519,18 @@ void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi, } } +void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi, + enum mipi_seq seq_id) +{ + if (seq_id == MIPI_SEQ_POWER_ON && intel_dsi->gpio_panel) + gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1); + + intel_dsi_vbt_exec(intel_dsi, seq_id); + + if (seq_id == MIPI_SEQ_POWER_OFF && intel_dsi->gpio_panel) + gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0); +} + void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec) { struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev); @@ -671,3 +683,33 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) return true; } + +/* + * On some BYT/CHT devs some sequences are incomplete and we need to manually + * control some GPIOs. + */ +void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi) +{ + struct drm_device *dev = intel_dsi->base.base.dev; + struct drm_i915_private *dev_priv = to_i915(dev); + struct mipi_config *mipi_config = dev_priv->vbt.dsi.config; + + if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && + mipi_config->pwm_blc == PPS_BLC_PMIC) { + intel_dsi->gpio_panel = + gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH); + + if (IS_ERR(intel_dsi->gpio_panel)) { + DRM_ERROR("Failed to own gpio for panel control\n"); + intel_dsi->gpio_panel = NULL; + } + } +} + +void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi) +{ + if (intel_dsi->gpio_panel) { + gpiod_put(intel_dsi->gpio_panel); + intel_dsi->gpio_panel = NULL; + } +} -- cgit v1.2.3 From 6c0a878ebaa43fc9d8d84ac4eacce9f6a9b974ac Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 16 Dec 2019 21:51:20 +0100 Subject: drm/i915/dsi: Init panel-enable GPIO to low when the LCD is initially off (v2) When the LCD has not been turned on by the firmware/GOP, because e.g. the device was booted with an external monitor connected over HDMI, we should not turn on the panel-enable GPIO when we request it. Turning on the panel-enable GPIO when we request it, means we turn it on too early in the init-sequence, which causes some panels to not correctly light up. This commits adds a panel_is_on parameter to intel_dsi_vbt_gpio_init() and makes intel_dsi_vbt_gpio_init() set the initial GPIO value accordingly. This fixes the panel not lighting up on a Thundersoft TST168 tablet when booted with an external monitor connected over HDMI. Changes in v2: - Call intel_dsi_get_hw_state() to check if the panel is on instead of relying on the current_mode pointer Reviewed-by: Linus Walleij Signed-off-by: Hans de Goede Reviewed-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/20191216205122.1850923-4-hdegoede@redhat.com --- drivers/gpu/drm/i915/display/intel_dsi.h | 2 +- drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 7 +++---- drivers/gpu/drm/i915/display/vlv_dsi.c | 4 +++- 3 files changed, 7 insertions(+), 6 deletions(-) (limited to 'drivers/gpu/drm/i915/display/intel_dsi_vbt.c') diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h index de7e51cd3460..675771ea91aa 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi.h +++ b/drivers/gpu/drm/i915/display/intel_dsi.h @@ -203,7 +203,7 @@ void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port); /* intel_dsi_vbt.c */ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id); -void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi); +void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on); void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi); void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi, enum mipi_seq seq_id); diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c index 8be7d6c507aa..4210f449553e 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c @@ -688,17 +688,16 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) * On some BYT/CHT devs some sequences are incomplete and we need to manually * control some GPIOs. */ -void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi) +void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on) { struct drm_device *dev = intel_dsi->base.base.dev; struct drm_i915_private *dev_priv = to_i915(dev); struct mipi_config *mipi_config = dev_priv->vbt.dsi.config; + enum gpiod_flags flags = panel_is_on ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && mipi_config->pwm_blc == PPS_BLC_PMIC) { - intel_dsi->gpio_panel = - gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH); - + intel_dsi->gpio_panel = gpiod_get(dev->dev, "panel", flags); if (IS_ERR(intel_dsi->gpio_panel)) { DRM_ERROR("Failed to own gpio for panel control\n"); intel_dsi->gpio_panel = NULL; diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c index a20b7d81a72f..bd368a023cd9 100644 --- a/drivers/gpu/drm/i915/display/vlv_dsi.c +++ b/drivers/gpu/drm/i915/display/vlv_dsi.c @@ -1815,6 +1815,7 @@ void vlv_dsi_init(struct drm_i915_private *dev_priv) struct drm_connector *connector; struct drm_display_mode *current_mode, *fixed_mode; enum port port; + enum pipe pipe; DRM_DEBUG_KMS("\n"); @@ -1913,7 +1914,8 @@ void vlv_dsi_init(struct drm_i915_private *dev_priv) vlv_dphy_param_init(intel_dsi); - intel_dsi_vbt_gpio_init(intel_dsi); + intel_dsi_vbt_gpio_init(intel_dsi, + intel_dsi_get_hw_state(intel_encoder, &pipe)); drm_connector_init(dev, connector, &intel_dsi_connector_funcs, DRM_MODE_CONNECTOR_DSI); -- cgit v1.2.3 From 067d1cf717b8a1d8429f858fbc9b5db71b880e5c Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 16 Dec 2019 21:51:21 +0100 Subject: drm/i915/dsi: Move Crystal Cove PMIC panel GPIO lookup from mfd to the i915 driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Move the Crystal Cove PMIC panel GPIO lookup-table from drivers/mfd/intel_soc_pmic_core.c to the i915 driver. The moved looked-up table is adding a GPIO lookup to the i915 PCI device and the GPIO subsys allows only one lookup table per device, The intel_soc_pmic_core.c code only adds lookup-table entries for the PMIC panel GPIO (as it deals only with the PMIC), but we also need to be able to access some GPIOs on the SoC itself, which requires entries for these GPIOs in the lookup-table. Since the lookup-table is attached to the i915 PCI device it really should be part of the i915 driver, this will also allow us to extend it with GPIOs from other sources when necessary. Acked-by: Linus Walleij Reviewed-by: Andy Shevchenko Reviewed-by: Ville Syrjälä Signed-off-by: Hans de Goede Acked-by: Lee Jones Link: https://patchwork.freedesktop.org/patch/msgid/20191216205122.1850923-5-hdegoede@redhat.com --- drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 23 ++++++++++++++++++++++- drivers/mfd/intel_soc_pmic_core.c | 19 ------------------- 2 files changed, 22 insertions(+), 20 deletions(-) (limited to 'drivers/gpu/drm/i915/display/intel_dsi_vbt.c') diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c index 4210f449553e..89558ccf79c8 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c @@ -25,6 +25,7 @@ */ #include +#include #include #include @@ -686,8 +687,18 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) /* * On some BYT/CHT devs some sequences are incomplete and we need to manually - * control some GPIOs. + * control some GPIOs. We need to add a GPIO lookup table before we get these. */ +static struct gpiod_lookup_table pmic_panel_gpio_table = { + /* Intel GFX is consumer */ + .dev_id = "0000:00:02.0", + .table = { + /* Panel EN/DISABLE */ + GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH), + { } + }, +}; + void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on) { struct drm_device *dev = intel_dsi->base.base.dev; @@ -697,6 +708,8 @@ void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on) if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && mipi_config->pwm_blc == PPS_BLC_PMIC) { + gpiod_add_lookup_table(&pmic_panel_gpio_table); + intel_dsi->gpio_panel = gpiod_get(dev->dev, "panel", flags); if (IS_ERR(intel_dsi->gpio_panel)) { DRM_ERROR("Failed to own gpio for panel control\n"); @@ -707,8 +720,16 @@ void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on) void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi) { + struct drm_device *dev = intel_dsi->base.base.dev; + struct drm_i915_private *dev_priv = to_i915(dev); + struct mipi_config *mipi_config = dev_priv->vbt.dsi.config; + if (intel_dsi->gpio_panel) { gpiod_put(intel_dsi->gpio_panel); intel_dsi->gpio_panel = NULL; } + + if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && + mipi_config->pwm_blc == PPS_BLC_PMIC) + gpiod_remove_lookup_table(&pmic_panel_gpio_table); } diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c index 47188df3080d..ddd64f9e3341 100644 --- a/drivers/mfd/intel_soc_pmic_core.c +++ b/drivers/mfd/intel_soc_pmic_core.c @@ -9,8 +9,6 @@ */ #include -#include -#include #include #include #include @@ -25,17 +23,6 @@ #define BYT_CRC_HRV 2 #define CHT_CRC_HRV 3 -/* Lookup table for the Panel Enable/Disable line as GPIO signals */ -static struct gpiod_lookup_table panel_gpio_table = { - /* Intel GFX is consumer */ - .dev_id = "0000:00:02.0", - .table = { - /* Panel EN/DISABLE */ - GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH), - { }, - }, -}; - /* PWM consumed by the Intel GFX */ static struct pwm_lookup crc_pwm_lookup[] = { PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_pmic_backlight", 0, PWM_POLARITY_NORMAL), @@ -96,9 +83,6 @@ static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c, if (ret) dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret); - /* Add lookup table binding for Panel Control to the GPIO Chip */ - gpiod_add_lookup_table(&panel_gpio_table); - /* Add lookup table for crc-pwm */ pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup)); @@ -121,9 +105,6 @@ static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c) regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data); - /* Remove lookup table for Panel Control from the GPIO Chip */ - gpiod_remove_lookup_table(&panel_gpio_table); - /* remove crc-pwm lookup table */ pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup)); -- cgit v1.2.3 From 25e8a3837d27526b2dcc4ad4e0aed9288a80036d Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 16 Dec 2019 21:51:22 +0100 Subject: drm/i915/dsi: Control panel and backlight enable GPIOs on BYT MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On Bay Trail devices the MIPI power on/off sequences for DSI LCD panels do not control the LCD panel- and backlight-enable GPIOs. So far, when the VBT indicates we should use the SoC for backlight control, we have been relying on these GPIOs being configured as output and driven high by the Video BIOS (GOP) when it initializes the panel. This does not work when the device is booted with a HDMI monitor connected as then the GOP will initialize the HDMI instead of the panel, leaving the panel black, even though the i915 driver tries to output an image to it. Likewise on some device-models when the GOP does not initialize the DSI panel it also leaves the mux of the PWM0 pin in generic GPIO mode instead of muxing it to the PWM controller. This commit makes the DSI code control the SoC GPIOs for panel- and backlight-enable on BYT, when the VBT indicates the SoC should be used for backlight control. It also ensures that the PWM0 pin is muxed to the PWM controller in this case. This fixes the LCD panel not lighting up on various devices when booted with a HDMI monitor connected. This has been tested to fix this on the following devices: Peaq C1010 Point of View MOBII TAB-P800W Point of View MOBII TAB-P1005W Terra Pad 1061 Yours Y8W81 Reviewed-by: Linus Walleij Reviewed-by: Ville Syrjälä Signed-off-by: Hans de Goede Link: https://patchwork.freedesktop.org/patch/msgid/20191216205122.1850923-6-hdegoede@redhat.com --- drivers/gpu/drm/i915/display/intel_dsi.h | 3 +- drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 64 ++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/i915/display/intel_dsi_vbt.c') diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h index 675771ea91aa..7481a5aa3084 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi.h +++ b/drivers/gpu/drm/i915/display/intel_dsi.h @@ -45,8 +45,9 @@ struct intel_dsi { struct intel_dsi_host *dsi_hosts[I915_MAX_PORTS]; intel_wakeref_t io_wakeref[I915_MAX_PORTS]; - /* GPIO Desc for CRC based Panel control */ + /* GPIO Desc for panel and backlight control */ struct gpio_desc *gpio_panel; + struct gpio_desc *gpio_backlight; struct intel_connector *attached_connector; diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c index 89558ccf79c8..0032161e0f76 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c @@ -27,6 +27,8 @@ #include #include #include +#include +#include #include #include @@ -525,11 +527,15 @@ void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi, { if (seq_id == MIPI_SEQ_POWER_ON && intel_dsi->gpio_panel) gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1); + if (seq_id == MIPI_SEQ_BACKLIGHT_ON && intel_dsi->gpio_backlight) + gpiod_set_value_cansleep(intel_dsi->gpio_backlight, 1); intel_dsi_vbt_exec(intel_dsi, seq_id); if (seq_id == MIPI_SEQ_POWER_OFF && intel_dsi->gpio_panel) gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0); + if (seq_id == MIPI_SEQ_BACKLIGHT_OFF && intel_dsi->gpio_backlight) + gpiod_set_value_cansleep(intel_dsi->gpio_backlight, 0); } void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec) @@ -688,6 +694,8 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) /* * On some BYT/CHT devs some sequences are incomplete and we need to manually * control some GPIOs. We need to add a GPIO lookup table before we get these. + * If the GOP did not initialize the panel (HDMI inserted) we may need to also + * change the pinmux for the SoC's PWM0 pin from GPIO to PWM. */ static struct gpiod_lookup_table pmic_panel_gpio_table = { /* Intel GFX is consumer */ @@ -699,23 +707,69 @@ static struct gpiod_lookup_table pmic_panel_gpio_table = { }, }; +static struct gpiod_lookup_table soc_panel_gpio_table = { + .dev_id = "0000:00:02.0", + .table = { + GPIO_LOOKUP("INT33FC:01", 10, "backlight", GPIO_ACTIVE_HIGH), + GPIO_LOOKUP("INT33FC:01", 11, "panel", GPIO_ACTIVE_HIGH), + { } + }, +}; + +static const struct pinctrl_map soc_pwm_pinctrl_map[] = { + PIN_MAP_MUX_GROUP("0000:00:02.0", "soc_pwm0", "INT33FC:00", + "pwm0_grp", "pwm"), +}; + void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on) { struct drm_device *dev = intel_dsi->base.base.dev; struct drm_i915_private *dev_priv = to_i915(dev); struct mipi_config *mipi_config = dev_priv->vbt.dsi.config; enum gpiod_flags flags = panel_is_on ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; + bool want_backlight_gpio = false; + bool want_panel_gpio = false; + struct pinctrl *pinctrl; + int ret; if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && mipi_config->pwm_blc == PPS_BLC_PMIC) { gpiod_add_lookup_table(&pmic_panel_gpio_table); + want_panel_gpio = true; + } + + if (IS_VALLEYVIEW(dev_priv) && mipi_config->pwm_blc == PPS_BLC_SOC) { + gpiod_add_lookup_table(&soc_panel_gpio_table); + want_panel_gpio = true; + want_backlight_gpio = true; + /* Ensure PWM0 pin is muxed as PWM instead of GPIO */ + ret = pinctrl_register_mappings(soc_pwm_pinctrl_map, + ARRAY_SIZE(soc_pwm_pinctrl_map)); + if (ret) + DRM_ERROR("Failed to register pwm0 pinmux mapping\n"); + + pinctrl = devm_pinctrl_get_select(dev->dev, "soc_pwm0"); + if (IS_ERR(pinctrl)) + DRM_ERROR("Failed to set pinmux to PWM\n"); + } + + if (want_panel_gpio) { intel_dsi->gpio_panel = gpiod_get(dev->dev, "panel", flags); if (IS_ERR(intel_dsi->gpio_panel)) { DRM_ERROR("Failed to own gpio for panel control\n"); intel_dsi->gpio_panel = NULL; } } + + if (want_backlight_gpio) { + intel_dsi->gpio_backlight = + gpiod_get(dev->dev, "backlight", flags); + if (IS_ERR(intel_dsi->gpio_backlight)) { + DRM_ERROR("Failed to own gpio for backlight control\n"); + intel_dsi->gpio_backlight = NULL; + } + } } void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi) @@ -729,7 +783,17 @@ void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi) intel_dsi->gpio_panel = NULL; } + if (intel_dsi->gpio_backlight) { + gpiod_put(intel_dsi->gpio_backlight); + intel_dsi->gpio_backlight = NULL; + } + if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && mipi_config->pwm_blc == PPS_BLC_PMIC) gpiod_remove_lookup_table(&pmic_panel_gpio_table); + + if (IS_VALLEYVIEW(dev_priv) && mipi_config->pwm_blc == PPS_BLC_SOC) { + pinctrl_unregister_mappings(soc_pwm_pinctrl_map); + gpiod_remove_lookup_table(&soc_panel_gpio_table); + } } -- cgit v1.2.3 From 8cbf89db294166cc13d90a89422605e0c9f8bbc2 Mon Sep 17 00:00:00 2001 From: Vivek Kasireddy Date: Fri, 10 Jan 2020 10:11:23 -0800 Subject: drm/i915/dsi: Parse the I2C element from the VBT MIPI sequence block (v3) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Parsing the i2c element is mainly done to transfer the payload from the MIPI sequence block to the relevant slave device. In some cases, the commands that are part of the payload can be used to turn on the backlight. This patch is actually a refactored version of this old patch: https://lists.freedesktop.org/archives/intel-gfx/2014-December/056897.html In addition to the refactoring, the original patch is augmented by looking up the i2c bus from ACPI NS instead of relying on the bus number provided in the VBT. This patch was tested on Aava Mobile's Inari 10 tablet. It enabled turning on the backlight by transferring the payload to the device. v2: - Add DRM_DEV_ERROR for invalid adapter and failed transfer and also drop the DRM_DEBUG that existed originally. (Hans) - Add two gotos instead of one to clean things up properly. v3: - Identify the device on which this patch was tested in the commit message (Ville) Cc: Hans de Goede Cc: Nabendu Maiti Cc: Matt Roper Cc: Bob Paauwe Cc: Ville Syrjälä Reviewed-by: Hans de Goede Signed-off-by: Vivek Kasireddy Signed-off-by: Matt Roper Link: https://patchwork.freedesktop.org/patch/msgid/20200110181123.14536-1-vivek.kasireddy@intel.com --- drivers/gpu/drm/i915/display/intel_dsi.h | 3 + drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 99 +++++++++++++++++++++++++++- 2 files changed, 100 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/i915/display/intel_dsi_vbt.c') diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h index 7481a5aa3084..6cef1356b4e6 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi.h +++ b/drivers/gpu/drm/i915/display/intel_dsi.h @@ -69,6 +69,9 @@ struct intel_dsi { /* number of DSI lanes */ unsigned int lane_count; + /* i2c bus associated with the slave device */ + int i2c_bus_num; + /* * video mode pixel format * diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c index 0032161e0f76..89fb0d90b694 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c @@ -86,6 +86,12 @@ static struct gpio_map vlv_gpio_table[] = { { VLV_GPIO_NC_11_PANEL1_BKLTCTL }, }; +struct i2c_adapter_lookup { + u16 slave_addr; + struct intel_dsi *intel_dsi; + acpi_handle dev_handle; +}; + #define CHV_GPIO_IDX_START_N 0 #define CHV_GPIO_IDX_START_E 73 #define CHV_GPIO_IDX_START_SW 100 @@ -378,11 +384,98 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data) return data; } +static int i2c_adapter_lookup(struct acpi_resource *ares, void *data) +{ + struct i2c_adapter_lookup *lookup = data; + struct intel_dsi *intel_dsi = lookup->intel_dsi; + struct acpi_resource_i2c_serialbus *sb; + struct i2c_adapter *adapter; + acpi_handle adapter_handle; + acpi_status status; + + if (intel_dsi->i2c_bus_num >= 0 || + !i2c_acpi_get_i2c_resource(ares, &sb)) + return 1; + + if (lookup->slave_addr != sb->slave_address) + return 1; + + status = acpi_get_handle(lookup->dev_handle, + sb->resource_source.string_ptr, + &adapter_handle); + if (ACPI_FAILURE(status)) + return 1; + + adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); + if (adapter) + intel_dsi->i2c_bus_num = adapter->nr; + + return 1; +} + static const u8 *mipi_exec_i2c(struct intel_dsi *intel_dsi, const u8 *data) { - DRM_DEBUG_KMS("Skipping I2C element execution\n"); + struct drm_device *drm_dev = intel_dsi->base.base.dev; + struct device *dev = &drm_dev->pdev->dev; + struct i2c_adapter *adapter; + struct acpi_device *acpi_dev; + struct list_head resource_list; + struct i2c_adapter_lookup lookup; + struct i2c_msg msg; + int ret; + u8 vbt_i2c_bus_num = *(data + 2); + u16 slave_addr = *(u16 *)(data + 3); + u8 reg_offset = *(data + 5); + u8 payload_size = *(data + 6); + u8 *payload_data; + + if (intel_dsi->i2c_bus_num < 0) { + intel_dsi->i2c_bus_num = vbt_i2c_bus_num; + + acpi_dev = ACPI_COMPANION(dev); + if (acpi_dev) { + memset(&lookup, 0, sizeof(lookup)); + lookup.slave_addr = slave_addr; + lookup.intel_dsi = intel_dsi; + lookup.dev_handle = acpi_device_handle(acpi_dev); + + INIT_LIST_HEAD(&resource_list); + acpi_dev_get_resources(acpi_dev, &resource_list, + i2c_adapter_lookup, + &lookup); + acpi_dev_free_resource_list(&resource_list); + } + } - return data + *(data + 6) + 7; + adapter = i2c_get_adapter(intel_dsi->i2c_bus_num); + if (!adapter) { + DRM_DEV_ERROR(dev, "Cannot find a valid i2c bus for xfer\n"); + goto err_bus; + } + + payload_data = kzalloc(payload_size + 1, GFP_KERNEL); + if (!payload_data) + goto err_alloc; + + payload_data[0] = reg_offset; + memcpy(&payload_data[1], (data + 7), payload_size); + + msg.addr = slave_addr; + msg.flags = 0; + msg.len = payload_size + 1; + msg.buf = payload_data; + + ret = i2c_transfer(adapter, &msg, 1); + if (ret < 0) + DRM_DEV_ERROR(dev, + "Failed to xfer payload of size (%u) to reg (%u)\n", + payload_size, reg_offset); + + kfree(payload_data); +err_alloc: + i2c_put_adapter(adapter); +err_bus: + return data + payload_size + 7; } static const u8 *mipi_exec_spi(struct intel_dsi *intel_dsi, const u8 *data) @@ -683,6 +776,8 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) intel_dsi->panel_off_delay = pps->panel_off_delay / 10; intel_dsi->panel_pwr_cycle_delay = pps->panel_power_cycle_delay / 10; + intel_dsi->i2c_bus_num = -1; + /* a regular driver would get the device in probe */ for_each_dsi_port(port, intel_dsi->ports) { mipi_dsi_attach(intel_dsi->dsi_hosts[port]->device); -- cgit v1.2.3