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drm/i915/dpt: Add a modparam to disable DPT via the chicken bit

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Add i915.enable_dpt modparam to allow disabling the DPT
usage in hardware via the chicken bit. Useful when debugging
potential DPT issues.

Quickly smoke tested on ADL.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230320090522.9909-6-ville.syrjala@linux.intel.com
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
This commit is contained in:
Ville Syrjälä
2023-03-20 11:05:21 +02:00
parent 5a08585d38
commit c5de248484
9 changed files with 46 additions and 3 deletions
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21
drivers/gpu/drm/i915/display/intel_dpt.c
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@@ -9,6 +9,8 @@
#include "gt/gen8_ppgtt.h"
#include "i915_drv.h"
#include "i915_reg.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dpt.h"
#include "intel_fb.h"
@@ -313,3 +315,22 @@ void intel_dpt_destroy(struct i915_address_space *vm)
dpt->obj->is_dpt = false;
i915_vm_put(&dpt->vm);
}
void intel_dpt_configure(struct intel_crtc *crtc)
{
struct drm_i915_private *i915 = to_i915(crtc->base.dev);
if (DISPLAY_VER(i915) == 14) {
enum pipe pipe = crtc->pipe;
enum plane_id plane_id;
for_each_plane_id_on_crtc(crtc, plane_id)
intel_de_rmw(i915, PLANE_CHICKEN(pipe, plane_id),
PLANE_CHICKEN_DISABLE_DPT,
i915->params.enable_dpt ? 0 : PLANE_CHICKEN_DISABLE_DPT);
} else if (DISPLAY_VER(i915) == 13) {
intel_de_rmw(i915, CHICKEN_MISC_2,
CHICKEN_MISC_DISABLE_DPT,
i915->params.enable_dpt ? 0 : CHICKEN_MISC_DISABLE_DPT);
}
}