linux-kernel - Re: [PATCH 1/2] drm: mali-dp: add malidp_crtc

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Date:   Wed, 1 Feb 2017 14:10:33 +0000
From:   Brian Starkey <brian.starkey@....com>
To:     Mihail Atanassov <mihail.atanassov@....com>
Cc:     dri-devel@...ts.freedesktop.org, Liviu Dudau <liviu.dudau@....com>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        Mali DP Maintainers <malidp@...s.arm.com>, nd@....com
Subject: Re: [PATCH 1/2] drm: mali-dp: add malidp_crtc_state struct

I'd be fine with you squashing these two together, but either way both
are:

Reviewed-by: Brian Starkey <brian.starkey@....com>

(two nitpicks below, but take them or leave them.)

On Wed, Feb 01, 2017 at 10:16:57AM +0000, Mihail Atanassov wrote:
>Add a custom CRTC state struct to enable storing driver-private per-CRTC
>state. This patch only adds the base drm_crtc_state struct.
>
>Signed-off-by: Mihail Atanassov <mihail.atanassov@....com>
>---
> drivers/gpu/drm/arm/malidp_crtc.c | 39 +++++++++++++++++++++++++++++++++++++--
> drivers/gpu/drm/arm/malidp_drv.h  |  6 ++++++
> 2 files changed, 43 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
>index 08e6a71..d1cd0e7 100644
>--- a/drivers/gpu/drm/arm/malidp_crtc.c
>+++ b/drivers/gpu/drm/arm/malidp_crtc.c
>@@ -160,6 +160,41 @@ static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
> 	return 0;
> }
>
>+static struct drm_crtc_state *malidp_crtc_duplicate_state(struct drm_crtc *crtc)
>+{
>+	struct malidp_crtc_state *cs;
>+	struct malidp_crtc_state *state;
>+
>+	if (WARN_ON(!crtc->state))
>+		return NULL;
>+
>+	cs = to_malidp_crtc_state(crtc->state);

This is unused in this commit.

>+	state = kmalloc(sizeof(*state), GFP_KERNEL);
>+	if (!state)
>+		return NULL;
>+
>+	__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
>+
>+	return &state->base;
>+}
>+
>+static void malidp_crtc_reset(struct drm_crtc *crtc)
>+{
>+	struct malidp_crtc_state *cs = (crtc->state) ?
>+				       to_malidp_crtc_state(crtc->state) : NULL;
>+
>+	if (crtc->state)
>+		__drm_atomic_helper_crtc_destroy_state(crtc->state);

I guess the compiler would do it anyway, but you could put the cs
assignment inside this 'if' instead of checking crtc->state twice.

>+
>+	kfree(cs);
>+	cs = kzalloc(sizeof(*cs), GFP_KERNEL);
>+	if (!cs)
>+		return;
>+
>+	crtc->state = &cs->base;
>+	crtc->state->crtc = crtc;
>+}
>+
> static const struct drm_crtc_helper_funcs malidp_crtc_helper_funcs = {
> 	.mode_fixup = malidp_crtc_mode_fixup,
> 	.enable = malidp_crtc_enable,
>@@ -171,8 +206,8 @@ static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
> 	.destroy = drm_crtc_cleanup,
> 	.set_config = drm_atomic_helper_set_config,
> 	.page_flip = drm_atomic_helper_page_flip,
>-	.reset = drm_atomic_helper_crtc_reset,
>-	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
>+	.reset = malidp_crtc_reset,
>+	.atomic_duplicate_state = malidp_crtc_duplicate_state,
> 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> };
>
>diff --git a/drivers/gpu/drm/arm/malidp_drv.h b/drivers/gpu/drm/arm/malidp_drv.h
>index 9fc8a2e..c7a69ae 100644
>--- a/drivers/gpu/drm/arm/malidp_drv.h
>+++ b/drivers/gpu/drm/arm/malidp_drv.h
>@@ -47,6 +47,12 @@ struct malidp_plane_state {
> #define to_malidp_plane(x) container_of(x, struct malidp_plane, base)
> #define to_malidp_plane_state(x) container_of(x, struct malidp_plane_state, base)
>
>+struct malidp_crtc_state {
>+	struct drm_crtc_state base;
>+};
>+
>+#define to_malidp_crtc_state(x) container_of(x, struct malidp_crtc_state, base)
>+
> int malidp_de_planes_init(struct drm_device *drm);
> void malidp_de_planes_destroy(struct drm_device *drm);
> int malidp_crtc_init(struct drm_device *drm);
>-- 
>1.9.1
>