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Message-ID: <20191216135135.GR1208@intel.com>
Date: Mon, 16 Dec 2019 15:51:35 +0200
From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
To: Hans de Goede <hdegoede@...hat.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Lee Jones <lee.jones@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>,
intel-gfx <intel-gfx@...ts.freedesktop.org>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-gpio@...r.kernel.org
Subject: Re: [PATCH 2/5] drm/i915/dsi: Move poking of panel-enable GPIO to
intel_dsi_vbt.c
On Sun, Dec 15, 2019 at 05:38:07PM +0100, Hans de Goede wrote:
> 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.
>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
> drivers/gpu/drm/i915/display/intel_dsi.h | 2 +
> drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 46 +++++++++++++++++++-
> drivers/gpu/drm/i915/display/vlv_dsi.c | 27 +-----------
> 3 files changed, 48 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h
> index b15be5814599..de7e51cd3460 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsi.h
> +++ b/drivers/gpu/drm/i915/display/intel_dsi.h
> @@ -203,6 +203,8 @@ 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_cleanup(struct intel_dsi *intel_dsi);
> void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi,
> enum mipi_seq seq_id);
> void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec);
> diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> index f90946c912ee..5352e8c9eca5 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)) {
Pointless parens around ==
Otherwise seems fine.
Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> + 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;
> + }
> +}
> diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
> index 6865fd4b5883..178d0fffba5b 100644
> --- a/drivers/gpu/drm/i915/display/vlv_dsi.c
> +++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
> @@ -23,7 +23,6 @@
> * Author: Jani Nikula <jani.nikula@...el.com>
> */
>
> -#include <linux/gpio/consumer.h>
> #include <linux/slab.h>
>
> #include <drm/drm_atomic_helper.h>
> @@ -797,9 +796,6 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
> if (!IS_GEMINILAKE(dev_priv))
> intel_dsi_prepare(encoder, pipe_config);
>
> - /* Power on, try both CRC pmic gpio and VBT */
> - if (intel_dsi->gpio_panel)
> - gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);
> intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
> intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay);
>
> @@ -943,11 +939,8 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder,
> /* Assert reset */
> intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_ASSERT_RESET);
>
> - /* Power off, try both CRC pmic gpio and VBT */
> intel_dsi_msleep(intel_dsi, intel_dsi->panel_off_delay);
> intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_OFF);
> - if (intel_dsi->gpio_panel)
> - gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0);
>
> /*
> * FIXME As we do with eDP, just make a note of the time here
> @@ -1539,10 +1532,7 @@ static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
> {
> struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
>
> - /* dispose of the gpios */
> - if (intel_dsi->gpio_panel)
> - gpiod_put(intel_dsi->gpio_panel);
> -
> + intel_dsi_vbt_gpio_cleanup(intel_dsi);
> intel_encoder_destroy(encoder);
> }
>
> @@ -1920,20 +1910,7 @@ void vlv_dsi_init(struct drm_i915_private *dev_priv)
>
> vlv_dphy_param_init(intel_dsi);
>
> - /*
> - * In case of BYT with CRC PMIC, we need to use GPIO for
> - * Panel control.
> - */
> - if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
> - (dev_priv->vbt.dsi.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;
> - }
> - }
> + intel_dsi_vbt_gpio_init(intel_dsi);
>
> drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
> DRM_MODE_CONNECTOR_DSI);
> --
> 2.23.0
--
Ville Syrjälä
Intel
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