From 548ecadf8b6557e613ede631efb6379ffc3544f0 Mon Sep 17 00:00:00 2001
From: Vandita Kulkarni <vandita.kulkarni@intel.com>
Date: Thu, 26 Aug 2021 11:18:10 +0530
Subject: drm/i915/dsi/xelpd: Add WA to program LP to HS wakeup guardband
Git-commit: f87c46c43175d382f3f1e4d067be529a84c6fb7c
Patch-mainline: v5.16-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Wa_16012360555 SW will have to program the "LP to HS Wakeup Guardband"
field to account for the repeaters on the HS Request/Ready PPI signaling
between the Display engine and the DPHY.
v2: Fix build issue.
v3: Align to new naming (Jani)
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210826054811.10572-2-vandita.kulkarni@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/display/icl_dsi.c | 23 +++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 8 ++++++++
2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 179eb49ce431..8a63e8c0dd47 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -1271,6 +1271,26 @@ static void icl_apply_kvmr_pipe_a_wa(struct intel_encoder *encoder,
IGNORE_KVMR_PIPE_A,
enable ? IGNORE_KVMR_PIPE_A : 0);
}
+
+/*
+ * Wa_16012360555:adl-p
+ * SW will have to program the "LP to HS Wakeup Guardband"
+ * to account for the repeaters on the HS Request/Ready
+ * PPI signaling between the Display engine and the DPHY.
+ */
+static void adlp_set_lp_hs_wakeup_gb(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+ enum port port;
+
+ if (DISPLAY_VER(i915) == 13) {
+ for_each_dsi_port(port, intel_dsi->ports)
+ intel_de_rmw(i915, TGL_DSI_CHKN_REG(port),
+ TGL_DSI_CHKN_LSHS_GB, 0x4);
+ }
+}
+
static void gen11_dsi_enable(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
@@ -1284,6 +1304,9 @@ static void gen11_dsi_enable(struct intel_atomic_state *state,
/* Wa_1409054076:icl,jsl,ehl */
icl_apply_kvmr_pipe_a_wa(encoder, crtc->pipe, true);
+ /* Wa_16012360555:adl-p */
+ adlp_set_lp_hs_wakeup_gb(encoder);
+
/* step6d: enable dsi transcoder */
gen11_dsi_enable_transcoder(encoder);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cd9863701af2..c8de2b4c6a9b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -11625,6 +11625,14 @@ enum skl_power_gate {
_ICL_DSI_IO_MODECTL_1)
#define COMBO_PHY_MODE_DSI (1 << 0)
+/* TGL DSI Chicken register */
+#define _TGL_DSI_CHKN_REG_0 0x6B0C0
+#define _TGL_DSI_CHKN_REG_1 0x6B8C0
+#define TGL_DSI_CHKN_REG(port) _MMIO_PORT(port, \
+ _TGL_DSI_CHKN_REG_0, \
+ _TGL_DSI_CHKN_REG_1)
+#define TGL_DSI_CHKN_LSHS_GB REG_GENMASK(15, 12)
+
/* Display Stream Splitter Control */
#define DSS_CTL1 _MMIO(0x67400)
#define SPLITTER_ENABLE (1 << 31)
--
2.38.1