[Intel-gfx] [PATCH 3/4] drm/i915: Execute RESET sequence before device ready

[Gaurav K Singh]

Before setting the MIPI device to ready state, execute the RESET
sequence.

Signed-off-by: Gaurav K Singh <gaurav.k.si...@intel.com>
---
 drivers/gpu/drm/i915/intel_dsi.c           |    2 ++
 drivers/gpu/drm/i915/intel_dsi_panel_vbt.c |   15 +++++++++++++++
 include/drm/drm_panel.h                    |    9 +++++++++
 3 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index ec7e48b..d7e2118 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -497,6 +497,8 @@ static void intel_dsi_pre_enable(struct intel_encoder 
*encoder)
                I915_WRITE(DSPCLK_GATE_D, tmp);
        }
 
+       drm_panel_reset(intel_dsi->panel);
+
        /* put device in ready state */
        intel_dsi_device_ready(encoder);
 
diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c 
b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index a5e99ac..feeca59 100644
--- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
@@ -292,6 +292,20 @@ static void generic_exec_sequence(struct intel_dsi 
*intel_dsi, const u8 *data)
        }
 }
 
+static int vbt_panel_reset(struct drm_panel *panel)
+{
+       struct vbt_panel *vbt_panel = to_vbt_panel(panel);
+       struct intel_dsi *intel_dsi = vbt_panel->intel_dsi;
+       struct drm_device *dev = intel_dsi->base.base.dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       const u8 *sequence;
+
+       sequence = dev_priv->vbt.dsi.sequence[MIPI_SEQ_ASSERT_RESET];
+       generic_exec_sequence(intel_dsi, sequence);
+
+       return 0;
+}
+
 static int vbt_panel_prepare(struct drm_panel *panel)
 {
        struct vbt_panel *vbt_panel = to_vbt_panel(panel);
@@ -377,6 +391,7 @@ static const struct drm_panel_funcs vbt_panel_funcs = {
        .disable = vbt_panel_disable,
        .unprepare = vbt_panel_unprepare,
        .prepare = vbt_panel_prepare,
+       .reset = vbt_panel_reset,
        .enable = vbt_panel_enable,
        .get_modes = vbt_panel_get_modes,
 };
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 13ff44b..1e2432e 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -68,6 +68,7 @@ struct display_timing;
 struct drm_panel_funcs {
        int (*disable)(struct drm_panel *panel);
        int (*unprepare)(struct drm_panel *panel);
+       int (*reset)(struct drm_panel *panel);
        int (*prepare)(struct drm_panel *panel);
        int (*enable)(struct drm_panel *panel);
        int (*get_modes)(struct drm_panel *panel);
@@ -101,6 +102,14 @@ static inline int drm_panel_disable(struct drm_panel 
*panel)
        return panel ? -ENOSYS : -EINVAL;
 }
 
+static inline int drm_panel_reset(struct drm_panel *panel)
+{
+       if (panel && panel->funcs && panel->funcs->prepare)
+               return panel->funcs->reset(panel);
+
+       return panel ? -ENOSYS : -EINVAL;
+}
+
 static inline int drm_panel_prepare(struct drm_panel *panel)
 {
        if (panel && panel->funcs && panel->funcs->prepare)
-- 
1.7.9.5

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