From ed69cd40685c949ec9c65701758bbf9e6840240f Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Mon, 2 Oct 2017 10:55:57 +0300
Subject: [PATCH] drm/i915/glk, cnl: Implement WaDisableScalarClockGating
Git-commit: ed69cd40685c949ec9c65701758bbf9e6840240f
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900
On GLK and CNL enabling a pipe with its pipe scaler enabled will result
in a FIFO underrun. This happens only once after driver loading or
system/runtime resume, more specifically after power well 1 gets
enabled; subsequent modesets seem to be free of underruns. The BSpec
workaround for this is to disable the pipe scaler clock gating for the
duration of modeset. Based on my tests disabling clock gating must be
done before enabling pipe scaling and we can re-enable it after the pipe
is enabled and one vblank has passed.
For consistency I also checked if plane scaling would cause the same
problem, but that doesn't seem to trigger this problem.
The patch is based on an earlier version from Ander.
v2 (Rodrigo):
- Set also CLKGATE_DIS_PSL bits 8 and 9.
- Add also the BSpec workaround ID.
Cc: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100302
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171002075557.32615-1-imre.deak@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/i915_reg.h | 10 ++++++++++
drivers/gpu/drm/i915/intel_display.c | 26 ++++++++++++++++++++++++++
2 files changed, 36 insertions(+)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3819,6 +3819,16 @@ enum {
#define PWM2_GATING_DIS (1 << 14)
#define PWM1_GATING_DIS (1 << 13)
+#define _CLKGATE_DIS_PSL_A 0x46520
+#define _CLKGATE_DIS_PSL_B 0x46524
+#define _CLKGATE_DIS_PSL_C 0x46528
+#define DPF_GATING_DIS (1 << 10)
+#define DPF_RAM_GATING_DIS (1 << 9)
+#define DPFR_GATING_DIS (1 << 8)
+
+#define CLKGATE_DIS_PSL(pipe) \
+ _MMIO_PIPE(pipe, _CLKGATE_DIS_PSL_A, _CLKGATE_DIS_PSL_B)
+
/*
* GEN10 clock gating regs
*/
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5459,6 +5459,20 @@ static bool hsw_crtc_supports_ips(struct
return HAS_IPS(to_i915(crtc->base.dev)) && crtc->pipe == PIPE_A;
}
+static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
+ enum pipe pipe, bool apply)
+{
+ u32 val = I915_READ(CLKGATE_DIS_PSL(pipe));
+ u32 mask = DPF_GATING_DIS | DPF_RAM_GATING_DIS | DPFR_GATING_DIS;
+
+ if (apply)
+ val |= mask;
+ else
+ val &= ~mask;
+
+ I915_WRITE(CLKGATE_DIS_PSL(pipe), val);
+}
+
static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
struct drm_atomic_state *old_state)
{
@@ -5469,6 +5483,7 @@ static void haswell_crtc_enable(struct i
enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
struct intel_atomic_state *old_intel_state =
to_intel_atomic_state(old_state);
+ bool psl_clkgate_wa;
if (WARN_ON(intel_crtc->active))
return;
@@ -5522,6 +5537,12 @@ static void haswell_crtc_enable(struct i
if (!transcoder_is_dsi(cpu_transcoder))
intel_ddi_enable_pipe_clock(pipe_config);
+ /* Display WA #1180: WaDisableScalarClockGating: glk, cnl */
+ psl_clkgate_wa = (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) &&
+ intel_crtc->config->pch_pfit.enabled;
+ if (psl_clkgate_wa)
+ glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, true);
+
if (INTEL_GEN(dev_priv) >= 9)
skylake_pfit_enable(intel_crtc);
else
@@ -5555,6 +5576,11 @@ static void haswell_crtc_enable(struct i
intel_encoders_enable(crtc, pipe_config, old_state);
+ if (psl_clkgate_wa) {
+ intel_wait_for_vblank(dev_priv, pipe);
+ glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, false);
+ }
+
if (intel_crtc->config->has_pch_encoder) {
intel_wait_for_vblank(dev_priv, pipe);
intel_wait_for_vblank(dev_priv, pipe);