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Message-ID: <891fe60a-cee9-29ab-3214-848b1161a0a7@collabora.com>
Date: Thu, 28 Sep 2023 12:00:30 +0200
From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
To: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
Jason-ch Chen <jason-ch.chen@...iatek.com>,
Johnson Wang <johnson.wang@...iatek.com>,
Singo Chang <singo.chang@...iatek.com>,
Nancy Lin <nancy.lin@...iatek.com>,
Shawn Sung <shawn.sung@...iatek.com>,
dri-devel@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Project_Global_Chrome_Upstream_Group@...iatek.com,
Nathan Lu <nathan.lu@...iatek.com>
Subject: Re: [PATCH v10 5/9] drm/mediatek: Add connector dynamic selection
capability
Il 27/09/23 17:38, Jason-JH.Lin ha scritto:
> Add dynamic select available connector flow in mtk_drm_crtc_create()
> and mtk_drm_crtc_atomic_enable().
>
> In mtk_drm_crtc_create(), if there is a connector routes array in drm
> driver data, all components definded in the connector routes array will
> be checked and their encoder_index will be set.
>
> In mtk_drm_crtc_atomic_enable(), crtc will check its encoder_index to
> identify which componet in the connector routes array should append.
>
> Signed-off-by: Nancy Lin <nancy.lin@...iatek.com>
> Signed-off-by: Nathan Lu <nathan.lu@...iatek.com>
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Tested-by: Fei Shao <fshao@...omium.org>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 78 ++++++++++++++++++++-
> drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 5 +-
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 27 ++++++-
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 +++-
> drivers/gpu/drm/mediatek/mtk_drm_drv.h | 7 ++
> 5 files changed, 123 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index b6fa4ad2f94d..8eb4d2646a76 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -63,6 +63,8 @@ struct mtk_drm_crtc {
> struct mtk_mutex *mutex;
> unsigned int ddp_comp_nr;
> struct mtk_ddp_comp **ddp_comp;
> + unsigned int num_conn_routes;
> + const struct mtk_drm_route *conn_routes;
>
> /* lock for display hardware access */
> struct mutex hw_lock;
> @@ -647,6 +649,45 @@ static void mtk_drm_crtc_disable_vblank(struct drm_crtc *crtc)
> mtk_ddp_comp_disable_vblank(comp);
> }
>
> +static void mtk_drm_crtc_update_output(struct drm_crtc *crtc,
> + struct drm_atomic_state *state)
> +{
> + int crtc_index = drm_crtc_index(crtc);
> + int i;
> + struct device *dev;
> + struct drm_crtc_state *crtc_state = state->crtcs[crtc_index].new_state;
> + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> + struct mtk_drm_private *priv = crtc->dev->dev_private;
> + unsigned int comp_id;
You're not using comp_id globally in this function....
> + unsigned int encoder_mask = crtc_state->encoder_mask;
> +
> + if (!crtc_state->connectors_changed)
> + return;
> +
> + if (!mtk_crtc->num_conn_routes)
> + return;
> +
> + priv = priv->all_drm_private[crtc_index];
This is a bit confusing. You're reassigning priv: please avoid that.
I would prefer directly seeing the final assignment, or otherwise two pointers.
struct mtk_drm_private *priv;
if ....
...........
priv = crtc->dev->dev_private->all_drm_private[crtc_index];
> + dev = priv->dev;
> +
> + dev_dbg(dev, "connector change:%d, encoder mask:0x%x for crtc:%d\n",
> + crtc_state->connectors_changed, encoder_mask, crtc_index);
> +
> + for (i = 0; i < mtk_crtc->num_conn_routes; i++) {
> + struct mtk_ddp_comp *comp;
...so you can move it here...
unsigned int comp_id = mtk_crtc->conn_routes[i].route_ddp;
struct mtk_ddp_comp *comp = &priv->ddp_comp[comp_id];
> +
> + comp_id = mtk_crtc->conn_routes[i].route_ddp;
> + comp = &priv->ddp_comp[comp_id];
> + if (comp->encoder_index >= 0 &&
> + encoder_mask & BIT(comp->encoder_index)) {
For readability, I would prefer to see
if (comp->encoder_index >= 0 &&
(encoder_mask & BIT(comp->encoder_index))) {
...but I don't have strong opinions on that.
> + mtk_crtc->ddp_comp[mtk_crtc->ddp_comp_nr - 1] = comp;
> + dev_dbg(dev, "Add comp_id: %d at path index %d\n",
> + comp->id, mtk_crtc->ddp_comp_nr - 1);
> + break;
> + }
> + }
> +}
> +
> int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
> struct mtk_plane_state *state)
> {
> @@ -679,6 +720,8 @@ static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,
>
> DRM_DEBUG_DRIVER("%s %d\n", __func__, crtc->base.id);
>
> + mtk_drm_crtc_update_output(crtc, state);
> +
What's the point of updating the output before pm_runtime_resume_and_get()?
If PM resume fails we're not enabling the CRTC so the update is actually useless.
Please move this after PM resume: that will also possibly come handy in the future.
> ret = pm_runtime_resume_and_get(comp->dev);
> if (ret < 0) {
> DRM_DEV_ERROR(comp->dev, "Failed to enable power domain: %d\n", ret);
> @@ -884,7 +927,8 @@ struct device *mtk_drm_crtc_dma_dev_get(struct drm_crtc *crtc)
>
> int mtk_drm_crtc_create(struct drm_device *drm_dev,
> const unsigned int *path, unsigned int path_len,
> - int priv_data_index)
> + int priv_data_index, const struct mtk_drm_route *conn_routes,
> + unsigned int num_conn_routes)
> {
> struct mtk_drm_private *priv = drm_dev->dev_private;
> struct device *dev = drm_dev->dev;
> @@ -935,7 +979,8 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>
> mtk_crtc->mmsys_dev = priv->mmsys_dev;
> mtk_crtc->ddp_comp_nr = path_len;
> - mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
> + mtk_crtc->ddp_comp = devm_kmalloc_array(dev,
> + mtk_crtc->ddp_comp_nr + (conn_routes ? 1 : 0),
> sizeof(*mtk_crtc->ddp_comp),
> GFP_KERNEL);
> if (!mtk_crtc->ddp_comp)
> @@ -1038,5 +1083,34 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
> }
> #endif
> +
> + if (conn_routes) {
> + struct device_node *node;
> + struct mtk_ddp_comp *comp;
> + unsigned int comp_id;
> +
> + for (i = 0; i < num_conn_routes; i++) {
Same here, you're locally using comp_id, node and comp *only* in the for loop....
unsigned int comp_id = conn_routes[i].route_ddp;
struct device_node *node = priv->comp_node[comp_id];
struct mtk_ddp_comp *comp = &priv->ddp_comp[comp_id];
> + comp_id = conn_routes[i].route_ddp;
> + node = priv->comp_node[comp_id];
> + comp = &priv->ddp_comp[comp_id];
> +
> + if (!comp->dev) {
> + dev_dbg(dev, "comp_id:%d, Component %pOF not initialized\n",
> + comp_id, node);
> + /* mark encoder_index to -1, if route comp device is not enabled */
> + comp->encoder_index = -1;
> + continue;
> + }
> +
> + mtk_ddp_comp_encoder_index_set(&priv->ddp_comp[comp_id]);
> + }
> +
> + mtk_crtc->num_conn_routes = num_conn_routes;
> + mtk_crtc->conn_routes = conn_routes;
> +
> + /* increase ddp_comp_nr at the end of mtk_drm_crtc_create */
> + mtk_crtc->ddp_comp_nr++;
> + }
> +
> return 0;
> }
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> index 3e9046993d09..3c224595fa71 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> @@ -8,6 +8,7 @@
>
> #include <drm/drm_crtc.h>
> #include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_drv.h"
> #include "mtk_drm_plane.h"
>
> #define MTK_LUT_SIZE 512
> @@ -18,7 +19,9 @@ void mtk_drm_crtc_commit(struct drm_crtc *crtc);
> int mtk_drm_crtc_create(struct drm_device *drm_dev,
> const unsigned int *path,
> unsigned int path_len,
> - int priv_data_index);
> + int priv_data_index,
> + const struct mtk_drm_route *conn_routes,
> + unsigned int num_conn_routes);
> int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
> struct mtk_plane_state *state);
> void mtk_drm_crtc_async_update(struct drm_crtc *crtc, struct drm_plane *plane,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 771f4e173353..4ddb5e561116 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -507,6 +507,23 @@ static bool mtk_drm_find_comp_in_ddp(struct device *dev,
> return false;
> }
>
> +static int mtk_drm_find_comp_in_ddp_conn_path(struct device *dev,
> + const struct mtk_drm_route *routes,
> + unsigned int num_routes,
> + struct mtk_ddp_comp *ddp_comp)
> +{
> + unsigned int i;
> +
> + if (!routes)
> + return -EINVAL;
> +
> + for (i = 0; i < num_routes; i++)
> + if (dev == ddp_comp[routes[i].route_ddp].dev)
> + return BIT(routes[i].crtc_id);
> +
> + return -ENODEV;
> +}
> +
> int mtk_ddp_comp_get_id(struct device_node *node,
> enum mtk_ddp_comp_type comp_type)
> {
> @@ -538,7 +555,15 @@ unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> private->data->third_len, private->ddp_comp))
> ret = BIT(2);
> else
> - DRM_INFO("Failed to find comp in ddp table\n");
> + ret = mtk_drm_find_comp_in_ddp_conn_path(dev,
> + private->data->conn_routes,
> + private->data->num_conn_routes,
> + private->ddp_comp);
> +
> + if (ret <= 0) {
> + DRM_INFO("Failed to find comp in ddp table, ret =%d\n", ret);
> + ret = 0;
Why are you returning 0 for error here?!
> + }
>
> return ret;
> }
Regards,
Angelo
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