From 4e123bd3039d585deb989a84dec04f9e0acda9d3 Mon Sep 17 00:00:00 2001
From: Madhav Chauhan <madhav.chauhan@intel.com>
Date: Tue, 30 Oct 2018 13:56:14 +0200
Subject: [PATCH] drm/i915/icl: Disable DSI transcoders
This patch disables transcoders by writing to TRANS_CONF
registers for each DSI ports.
v2 by Jani:
- Wait for pipeconf active to go low
Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c76035309fa721322cf9c1ca7fc42b822937c2f3.1540900289.git.jani.nikula@intel.com
---
drivers/gpu/drm/i915/icl_dsi.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index f7f48ff147d0..644ad7475920 100644
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -777,6 +777,29 @@ gen11_dsi_pre_enable(struct intel_encoder *encoder,
intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_ON);
}
+static void gen11_dsi_disable_transcoder(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+ enum port port;
+ enum transcoder dsi_trans;
+ u32 tmp;
+
+ for_each_dsi_port(port, intel_dsi->ports) {
+ dsi_trans = dsi_port_to_transcoder(port);
+
+ /* disable transcoder */
+ tmp = I915_READ(PIPECONF(dsi_trans));
+ tmp &= ~PIPECONF_ENABLE;
+ I915_WRITE(PIPECONF(dsi_trans), tmp);
+
+ /* wait for transcoder to be disabled */
+ if (intel_wait_for_register(dev_priv, PIPECONF(dsi_trans),
+ I965_PIPECONF_ACTIVE, 0, 50))
+ DRM_ERROR("DSI trancoder not disabled\n");
+ }
+}
+
static void __attribute__((unused)) gen11_dsi_disable(
struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state,
@@ -787,4 +810,7 @@ static void __attribute__((unused)) gen11_dsi_disable(
/* step1: turn off backlight */
intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF);
intel_panel_disable_backlight(old_conn_state);
+
+ /* step2d,e: disable transcoder and wait */
+ gen11_dsi_disable_transcoder(encoder);
}
--
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