[Intel-gfx] [PATCH v3 3/3] drm/i915/intel_dsi_vbt: Add support for PMIC MIPI sequences

[Hans de Goede]

Add support for PMIC MIPI sequences using the new
intel_soc_pmic_exec_mipi_pmic_seq_element function.

This fixes the DSI LCD panel not lighting up when not initialized by the
GOP (because an external monitor was connected) on GPD win and GPD pocket
devices.

Specifically the LCD panel seems to need GPIO pin 9 on the PMIC to be
driven high, which is done through a PMIC MIPI sequence. Before this commit
if the sequence was not executed by the GOP the pin would stay low causing
the LCD panel to not work. Having the MIPI sequences properly control this
GPIO should also help save some power when the panel is off.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/gpu/drm/i915/intel_dsi_vbt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
index f27af47c6e49..6a2ed1ca72e0 100644
--- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -29,6 +29,7 @@
 #include <drm/drm_edid.h>
 #include <drm/i915_drm.h>
 #include <linux/gpio/consumer.h>
+#include <linux/mfd/intel_soc_pmic.h>
 #include <linux/slab.h>
 #include <video/mipi_display.h>
 #include <asm/intel-mid.h>
@@ -371,7 +372,11 @@ static const u8 *mipi_exec_spi(struct intel_dsi *intel_dsi, const u8 *data)
 
 static const u8 *mipi_exec_pmic(struct intel_dsi *intel_dsi, const u8 *data)
 {
+#ifdef CONFIG_PMIC_OPREGION
+	intel_soc_pmic_exec_mipi_pmic_seq_element(data);
+#else
 	DRM_DEBUG_KMS("Skipping PMIC element execution\n");
+#endif
 
 	return data + 15;
 }
-- 
2.19.2