From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Currently we have no sane way to forcibly disable SAGV, which makes debugging things a PITA. Manually poking at the pcode mailbox with it's various SAGV/QGV/PSF formats is no fun, and likely to be clobbered by the driver anyway. Let's add a modparam for this. Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/skl_watermark.c | 4 ++++ drivers/gpu/drm/i915/i915_params.c | 3 +++ drivers/gpu/drm/i915/i915_params.h | 1 + 3 files changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c index 50a9a6adbe32..ff70225c0263 100644 --- a/drivers/gpu/drm/i915/display/skl_watermark.c +++ b/drivers/gpu/drm/i915/display/skl_watermark.c @@ -411,6 +411,9 @@ static bool intel_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); struct drm_i915_private *i915 = to_i915(crtc->base.dev); + if (!i915->params.enable_sagv) + return false; + if (DISPLAY_VER(i915) >= 12) return tgl_crtc_can_enable_sagv(crtc_state); else @@ -3696,6 +3699,7 @@ static int intel_sagv_status_show(struct seq_file *m, void *unused) }; seq_printf(m, "SAGV available: %s\n", str_yes_no(intel_has_sagv(i915))); + seq_printf(m, "SAGV modparam: %s\n", str_enabled_disabled(i915->params.enable_sagv)); seq_printf(m, "SAGV status: %s\n", sagv_status[i915->display.sagv.status]); seq_printf(m, "SAGV block time: %d usec\n", i915->display.sagv.block_time_us); diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index ade744cccfea..66141906ea05 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -121,6 +121,9 @@ i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, "(0=disabled, 1=enabled) " "Default: 0"); +i915_param_named_unsafe(enable_sagv, bool, 0600, + "Enable system agent voltage/frequency scaling (SAGV) (default: true)"); + i915_param_named_unsafe(force_probe, charp, 0400, "Force probe options for specified supported devices. " "See CONFIG_DRM_I915_FORCE_PROBE for details."); diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h index 3f51f90145b6..6798b5c2363d 100644 --- a/drivers/gpu/drm/i915/i915_params.h +++ b/drivers/gpu/drm/i915/i915_params.h @@ -56,6 +56,7 @@ struct drm_printer; param(int, enable_psr, -1, 0600) \ param(bool, psr_safest_params, false, 0400) \ param(bool, enable_psr2_sel_fetch, true, 0400) \ + param(bool, enable_sagv, true, 0600) \ param(int, disable_power_well, -1, 0400) \ param(int, enable_ips, 1, 0600) \ param(int, invert_brightness, 0, 0600) \ -- 2.39.2
