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drm/i915: Add i915.enable_sagv modparam 

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@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230322181219.5511-1-ville.syrjala@linux.intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Ville Syrjälä 2023-03-22 20:12:19 +02:00
parent 2e4026a1a2
commit 419e505dab
3 changed files with 8 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/skl_watermark.c
View File

@ -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);

3
drivers/gpu/drm/i915/i915_params.c
View File

@ -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.");

1
drivers/gpu/drm/i915/i915_params.h
View File

@ -57,6 +57,7 @@ struct drm_printer;
param(bool, enable_dpt, true, 0400) \
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) \