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drm/i915/display/vrr: Send VRR push to flip the frame 

VRR achieves vblank stretching using the HW PUSH functionality.
So once the VRR is enabled during modeset then for each flip
request from userspace, in the atomic tail pipe_update_end()
we need to set the VRR push bit in HW for it to terminate
the vblank at configured flipline or anytime after flipline
or latest at the Vmax.

The HW clears the PUSH bit after the double buffer updates
are completed.

v2:
* Move send push to after irq en (Manasi)
* Call send push unconditionally (Jani N)

v3:
* Stall w.r.t Vrr vmax (Manasi, Gary Smith)

v4:
* Remove the rmw (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Gary Smith <gary.k.smith@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210122232647.22688-11-manasi.d.navare@intel.com
This commit is contained in:
Manasi Navare 2021-01-22 15:26:40 -08:00
parent aa52b39dc5
commit 13c6d51f53
3 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/display/intel_sprite.c
View File

@ -50,6 +50,7 @@
#include "intel_dsi.h"
#include "intel_sprite.h"
#include "i9xx_plane.h"
#include "intel_vrr.h"
int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
int usecs)
@ -266,6 +267,9 @@ void intel_pipe_update_end(struct intel_crtc_state *new_crtc_state)
local_irq_enable();
/* Send VRR Push to terminate Vblank */
intel_vrr_send_push(new_crtc_state);
if (intel_vgpu_active(dev_priv))
return;

13
drivers/gpu/drm/i915/display/intel_vrr.c
View File

@ -121,3 +121,16 @@ void intel_vrr_enable(struct intel_encoder *encoder,
intel_de_write(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder), crtc_state->vrr.flipline - 1);
intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder), TRANS_PUSH_EN);
}
void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
if (!crtc_state->vrr.enable)
return;
intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder),
TRANS_PUSH_EN | TRANS_PUSH_SEND);
}

1
drivers/gpu/drm/i915/display/intel_vrr.h
View File

@ -22,5 +22,6 @@ void intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state);
void intel_vrr_enable(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state);
void intel_vrr_send_push(const struct intel_crtc_state *crtc_state);
#endif /* __INTEL_VRR_H__ */