Re: [PATCH 3/5] drm/i915/dsi: Init panel-enable GPIO to low when the LCD is initially off

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Hi,

On 16-12-2019 15:14, Ville Syrjälä wrote:
On Mon, Dec 16, 2019 at 02:51:54PM +0100, Hans de Goede wrote:
Hi,

Thank you for the reviews.

On 16-12-2019 14:45, Ville Syrjälä wrote:
On Sun, Dec 15, 2019 at 05:38:08PM +0100, Hans de Goede wrote:
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.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
   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       | 2 +-
   3 files changed, 5 insertions(+), 6 deletions(-)

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 5352e8c9eca5..027970348b22 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;

Can't we just tell it not to change the current setting?

We could use GPIOD_ASIS for that, but with the SoC pins (when the PMIC is
not used for backlight control) things get a bit muddy, I've seen several
instances of this message from drivers/pinctrl/intel/pinctrl-baytrail.c
trigger when the GOP did not init the panel:

dev_warn(vg->dev, FW_BUG "pin %u forcibly re-configured as GPIO\n", offset);

And in that case with GPIOD_ASIS I have no idea which we initially get,
so this approach, where we clearly define which initial value we want,
seems better.

I suppose. Probably better to not abuse the current_mode pointer for
that though and just explicitly call encoder->get_hw_state() instead.

Ok, I'll fix this for v2 of the patch-set.

Regards,

Hans





p.s.

The intel-gfx CI seems to seriously dislike my patches lately, almost
always failing them; and usually on what at least seem to be unrelated
test-cases. Any advice on how to deal with this?

Yeah, CI is snafu. I keep smashing retest until it gets through BAT
and then just double check the shard results to make sure nothing
relevant has tripped. If things look OK I recommend replying to the
result mail and provide a few short log snippets/other details on
what failed so that it's clear that it's irrelevant.






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 178d0fffba5b..e86e4a11e199 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
@@ -1910,7 +1910,7 @@ 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, current_mode != NULL);
drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
   			   DRM_MODE_CONNECTOR_DSI);
--
2.23.0



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