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SubjectRe: [PATCH v12 13/14] drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver
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On 30/01/2023 17:11, Vinod Polimera wrote:
> Enable PSR on eDP interface using drm self-refresh librabry.
> This patch uses a trigger from self-refresh library to enter/exit
> into PSR, when there are no updates from framework.
>
> Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 13 ++++++++++++-
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 14 ++++++++++++++
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 2 +-
> 3 files changed, 27 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index f29a339..60e5984 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -21,6 +21,7 @@
> #include <drm/drm_probe_helper.h>
> #include <drm/drm_rect.h>
> #include <drm/drm_vblank.h>
> +#include <drm/drm_self_refresh_helper.h>
>
> #include "dpu_kms.h"
> #include "dpu_hw_lm.h"
> @@ -1021,6 +1022,9 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
>
> DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
>
> + if (old_crtc_state->self_refresh_active)
> + return;
> +

I have been looking at the crtc_needs_disable(). It explicitly mentions
that 'We also need to run through the crtc_funcs->disable() function
[..] if it's transitioning to self refresh mode...'. Don't we need to
perform some cleanup here (like disabling the vblank irq handling,
freeing the bandwidth, etc)?

> /* Disable/save vblank irq handling */
> drm_crtc_vblank_off(crtc);
>
> @@ -1577,7 +1581,7 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
> {
> struct drm_crtc *crtc = NULL;
> struct dpu_crtc *dpu_crtc = NULL;
> - int i;
> + int i, ret;
>
> dpu_crtc = kzalloc(sizeof(*dpu_crtc), GFP_KERNEL);
> if (!dpu_crtc)
> @@ -1614,6 +1618,13 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
> /* initialize event handling */
> spin_lock_init(&dpu_crtc->event_lock);
>
> + ret = drm_self_refresh_helper_init(crtc);
> + if (ret) {
> + DPU_ERROR("Failed to initialize %s with self-refresh helpers %d\n",
> + crtc->name, ret);
> + return ERR_PTR(ret);
> + }
> +
> DRM_DEBUG_KMS("%s: successfully initialized crtc\n", dpu_crtc->name);
> return crtc;
> }
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 01b7509..450abb1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -12,6 +12,7 @@
> #include <linux/kthread.h>
> #include <linux/seq_file.h>
>
> +#include <drm/drm_atomic.h>
> #include <drm/drm_crtc.h>
> #include <drm/drm_file.h>
> #include <drm/drm_probe_helper.h>
> @@ -1212,11 +1213,24 @@ static void dpu_encoder_virt_atomic_disable(struct drm_encoder *drm_enc,
> struct drm_atomic_state *state)
> {
> struct dpu_encoder_virt *dpu_enc = NULL;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *old_state = NULL;
> int i = 0;
>
> dpu_enc = to_dpu_encoder_virt(drm_enc);
> DPU_DEBUG_ENC(dpu_enc, "\n");
>
> + crtc = drm_atomic_get_old_crtc_for_encoder(state, drm_enc);
> + if (crtc)
> + old_state = drm_atomic_get_old_crtc_state(state, crtc);
> +
> + /*
> + * The encoder is already disabled if self refresh mode was set earlier,
> + * in the old_state for the corresponding crtc.
> + */
> + if (old_state && old_state->self_refresh_active)
> + return;
> +

Again the same question here, doesn't crtc_needs_disable() take care of
this clause? I might be missing something in the PSR state transitions.
Could you please add some explanation here?

> mutex_lock(&dpu_enc->enc_lock);
> dpu_enc->enabled = false;
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index a683bd9..681dd2e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -491,7 +491,7 @@ static void dpu_kms_wait_for_commit_done(struct msm_kms *kms,
> return;
> }
>
> - if (!crtc->state->active) {
> + if (!drm_atomic_crtc_effectively_active(crtc->state)) {
> DPU_DEBUG("[crtc:%d] not active\n", crtc->base.id);
> return;
> }

--
With best wishes
Dmitry

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