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SubjectRe: [PATCH v3 06/11] drm: Use state helper instead of plane state pointer in atomic_check
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Am 19.02.21 um 13:00 schrieb Maxime Ripard:
> Many drivers reference the plane->state pointer in order to get the
> current plane state in their atomic_check hook, which would be the old
> plane state in the global atomic state since _swap_state hasn't happened
> when atomic_check is run.
>
> Use the drm_atomic_get_old_plane_state helper to get that state to make
> it more obvious.
>
> This was made using the coccinelle script below:
>
> @ plane_atomic_func @
> identifier helpers;
> identifier func;
> @@
>
> static struct drm_plane_helper_funcs helpers = {
> ...,
> .atomic_check = func,
> ...,
> };
>
> @ replaces_old_state @
> identifier plane_atomic_func.func;
> identifier plane, state, plane_state;
> @@
>
> func(struct drm_plane *plane, struct drm_atomic_state *state) {
> ...
> - struct drm_plane_state *plane_state = plane->state;
> + struct drm_plane_state *plane_state = drm_atomic_get_old_plane_state(state, plane);
> ...
> }
>
> @@
> identifier plane_atomic_func.func;
> identifier plane, state, plane_state;
> @@
>
> func(struct drm_plane *plane, struct drm_atomic_state *state) {
> struct drm_plane_state *plane_state = drm_atomic_get_old_plane_state(state, plane);
> <...
> - plane->state
> + plane_state
> ...>
> }
>
> @ adds_old_state @
> identifier plane_atomic_func.func;
> identifier plane, state;
> @@
>
> func(struct drm_plane *plane, struct drm_atomic_state *state) {
> + struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
> <...
> - plane->state
> + old_plane_state
> ...>
> }
>
> @ include depends on adds_old_state || replaces_old_state @
> @@
>
> #include <drm/drm_atomic.h>
>
> @ no_include depends on !include && (adds_old_state || replaces_old_state) @
> @@
>
> + #include <drm/drm_atomic.h>
> #include <drm/...>
>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

However, I find 'old plane state' somewhat confusing in this context,
because it's actually the current plane state. Would it make sense to
use drm_atomic_get_existing_plane_state() instead?

Best regards
Thomas

>
> ---
>
> Changes from v2:
> - s/.../<.../ in the coccinelle script as suggested by Ville
> ---
> drivers/gpu/drm/imx/ipuv3-plane.c | 3 ++-
> drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 16 +++++++++-------
> drivers/gpu/drm/ingenic/ingenic-ipu.c | 8 +++++---
> drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 4 +++-
> drivers/gpu/drm/tilcdc/tilcdc_plane.c | 3 ++-
> 5 files changed, 21 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
> index b5f6123850bb..6484592e3f86 100644
> --- a/drivers/gpu/drm/imx/ipuv3-plane.c
> +++ b/drivers/gpu/drm/imx/ipuv3-plane.c
> @@ -341,7 +341,8 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
> {
> struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
> plane);
> - struct drm_plane_state *old_state = plane->state;
> + struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
> + plane);
> struct drm_crtc_state *crtc_state;
> struct device *dev = plane->dev->dev;
> struct drm_framebuffer *fb = new_state->fb;
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index e6d7d0a04ddb..c022d9f1e737 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -361,11 +361,13 @@ static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> static int ingenic_drm_plane_atomic_check(struct drm_plane *plane,
> struct drm_atomic_state *state)
> {
> + struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state,
> + plane);
> struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
> plane);
> struct ingenic_drm *priv = drm_device_get_priv(plane->dev);
> struct drm_crtc_state *crtc_state;
> - struct drm_crtc *crtc = new_plane_state->crtc ?: plane->state->crtc;
> + struct drm_crtc *crtc = new_plane_state->crtc ?: old_plane_state->crtc;
> int ret;
>
> if (!crtc)
> @@ -399,12 +401,12 @@ static int ingenic_drm_plane_atomic_check(struct drm_plane *plane,
> * its position, size or depth.
> */
> if (priv->soc_info->has_osd &&
> - (!plane->state->fb || !new_plane_state->fb ||
> - plane->state->crtc_x != new_plane_state->crtc_x ||
> - plane->state->crtc_y != new_plane_state->crtc_y ||
> - plane->state->crtc_w != new_plane_state->crtc_w ||
> - plane->state->crtc_h != new_plane_state->crtc_h ||
> - plane->state->fb->format->format != new_plane_state->fb->format->format))
> + (!old_plane_state->fb || !new_plane_state->fb ||
> + old_plane_state->crtc_x != new_plane_state->crtc_x ||
> + old_plane_state->crtc_y != new_plane_state->crtc_y ||
> + old_plane_state->crtc_w != new_plane_state->crtc_w ||
> + old_plane_state->crtc_h != new_plane_state->crtc_h ||
> + old_plane_state->fb->format->format != new_plane_state->fb->format->format))
> crtc_state->mode_changed = true;
>
> return 0;
> diff --git a/drivers/gpu/drm/ingenic/ingenic-ipu.c b/drivers/gpu/drm/ingenic/ingenic-ipu.c
> index 1e1b0fe095bd..3d072b25e1c4 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-ipu.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-ipu.c
> @@ -516,11 +516,13 @@ static void ingenic_ipu_plane_atomic_update(struct drm_plane *plane,
> static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane,
> struct drm_atomic_state *state)
> {
> + struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state,
> + plane);
> struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
> plane);
> unsigned int num_w, denom_w, num_h, denom_h, xres, yres, max_w, max_h;
> struct ingenic_ipu *ipu = plane_to_ingenic_ipu(plane);
> - struct drm_crtc *crtc = new_plane_state->crtc ?: plane->state->crtc;
> + struct drm_crtc *crtc = new_plane_state->crtc ?: old_plane_state->crtc;
> struct drm_crtc_state *crtc_state;
>
> if (!crtc)
> @@ -531,7 +533,7 @@ static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane,
> return -EINVAL;
>
> /* Request a full modeset if we are enabling or disabling the IPU. */
> - if (!plane->state->crtc ^ !new_plane_state->crtc)
> + if (!old_plane_state->crtc ^ !new_plane_state->crtc)
> crtc_state->mode_changed = true;
>
> if (!new_plane_state->crtc ||
> @@ -552,7 +554,7 @@ static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane,
> if (((new_plane_state->src_w >> 16) & 1) || (new_plane_state->crtc_w & 1))
> return -EINVAL;
>
> - if (!osd_changed(new_plane_state, plane->state))
> + if (!osd_changed(new_plane_state, old_plane_state))
> return 0;
>
> crtc_state->mode_changed = true;
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> index 4aac6217a5ad..6ce6ce09fecc 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> @@ -406,12 +406,14 @@ static int mdp5_plane_atomic_check_with_state(struct drm_crtc_state *crtc_state,
> static int mdp5_plane_atomic_check(struct drm_plane *plane,
> struct drm_atomic_state *state)
> {
> + struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state,
> + plane);
> struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
> plane);
> struct drm_crtc *crtc;
> struct drm_crtc_state *crtc_state;
>
> - crtc = new_plane_state->crtc ? new_plane_state->crtc : plane->state->crtc;
> + crtc = new_plane_state->crtc ? new_plane_state->crtc : old_plane_state->crtc;
> if (!crtc)
> return 0;
>
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_plane.c b/drivers/gpu/drm/tilcdc/tilcdc_plane.c
> index ebdd42dcaf82..c86258132432 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_plane.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_plane.c
> @@ -26,7 +26,8 @@ static int tilcdc_plane_atomic_check(struct drm_plane *plane,
> struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
> plane);
> struct drm_crtc_state *crtc_state;
> - struct drm_plane_state *old_state = plane->state;
> + struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
> + plane);
> unsigned int pitch;
>
> if (!new_state->crtc)
>

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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