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Message-ID: <f1db85a9d90dac2aea091a6b7d751a2076879506.camel@mediatek.com>
Date: Thu, 1 Jun 2023 14:53:40 +0000
From: Jason-JH Lin (林睿祥)
<Jason-JH.Lin@...iatek.com>
To: "amergnat@...libre.com" <amergnat@...libre.com>,
"angelogioacchino.delregno@...labora.com"
<angelogioacchino.delregno@...labora.com>,
"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>,
Singo Chang (張興國)
<Singo.Chang@...iatek.com>,
Johnson Wang (王聖鑫)
<Johnson.Wang@...iatek.com>,
Jason-ch Chen (陳建豪)
<Jason-ch.Chen@...iatek.com>,
Shawn Sung (宋孝謙)
<Shawn.Sung@...iatek.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Project_Global_Chrome_Upstream_Group
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
Nathan Lu (呂東霖) <Nathan.Lu@...iatek.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
Rex-BC Chen (陳柏辰)
<Rex-BC.Chen@...iatek.com>
Subject: Re: [PATCH v3 1/2] drm/mediatek: Add ability to support dynamic
connector selection
Hi Angelo,
Thanks for the review and sorry for the late reply.
On Thu, 2023-05-18 at 11:29 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>
>
> Il 09/05/23 17:07, Jason-JH.Lin ha scritto:
> > 1. Move output drm connector from each ddp_path array to connector
> > array.
> > 2. Add dynamic select available connector flow in crtc create and
> > enable.
> >
> > 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>
> > ---
> > drivers/gpu/drm/mediatek/mtk_disp_drv.h | 1 +
> > drivers/gpu/drm/mediatek/mtk_dpi.c | 9 ++
> > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 111
> > +++++++++++++++++++-
> > 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_ddp_comp.h | 8 ++
> > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 44 ++++++--
> > drivers/gpu/drm/mediatek/mtk_drm_drv.h | 8 ++
> > 8 files changed, 202 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > index 2254038519e1..72c57442f965 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > @@ -44,6 +44,7 @@ void mtk_dither_set_common(void __iomem *regs,
> > struct cmdq_client_reg *cmdq_reg,
> >
> > void mtk_dpi_start(struct device *dev);
> > void mtk_dpi_stop(struct device *dev);
> > +int mtk_dpi_encoder_index(struct device *dev);
> >
> > void mtk_dsi_ddp_start(struct device *dev);
> > void mtk_dsi_ddp_stop(struct device *dev);
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index 948a53f1f4b3..765fc976e41f 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -782,6 +782,15 @@ void mtk_dpi_stop(struct device *dev)
> > mtk_dpi_power_off(dpi);
> > }
> >
> > +int mtk_dpi_encoder_index(struct device *dev)
> > +{
> > + struct mtk_dpi *dpi = dev_get_drvdata(dev);
> > + int encoder_index = drm_encoder_index(&dpi->encoder);
> > +
> > + dev_dbg(dev, "encoder index:%d", encoder_index);
> > + return encoder_index;
> > +}
> > +
> > static int mtk_dpi_bind(struct device *dev, struct device
> > *master, void *data)
> > {
> > struct mtk_dpi *dpi = dev_get_drvdata(dev);
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index d40142842f85..54d48932b833 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -60,8 +60,12 @@ struct mtk_drm_crtc {
> > struct device *mmsys_dev;
> > struct device *dma_dev;
> > struct mtk_mutex *mutex;
> > + unsigned int ddp_comp_nr_ori;
> > + unsigned int max_ddp_comp_nr;
> > unsigned int ddp_comp_nr;
> > struct mtk_ddp_comp **ddp_comp;
> > + unsigned int conn_route_nr;
>
> `num_conn_routes` is clearer.
>
OK, I'll modify it.
> > + const struct mtk_drm_route *conn_routes;
> >
> > /* lock for display hardware access */
> > struct mutex hw_lock;
> > @@ -649,6 +653,84 @@ static void mtk_drm_crtc_disable_vblank(struct
> > drm_crtc *crtc)
> > mtk_ddp_comp_disable_vblank(comp);
> > }
> >
> > +static unsigned int mtk_drm_crtc_max_num_route_comp(struct
> > mtk_drm_crtc *mtk_crtc)
> > +{
> > + unsigned int max_num = 0;
> > + unsigned int i;
> > +
> > + if (!mtk_crtc->conn_route_nr)
> > + return 0;
> > +
> > + for (i = 0; i < mtk_crtc->conn_route_nr; i++)
> > + max_num = max(mtk_crtc->conn_routes[i].route_len,
> > max_num);
>
> If we rename this to `num_routes` or `max_routes` it becomes a bit
> more
> understandable.
>
OK, I'll modify it.
> > +
> > + return max_num;
> > +}
> > +
> > +static int mtk_drm_crtc_update_output(struct drm_crtc *crtc,
> > + struct drm_atomic_state *state)
> > +{
> > + const struct mtk_drm_route *conn_routes;
> > + 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;
> > + unsigned int encoder_mask = crtc_state->encoder_mask;
> > + unsigned int route_len = 0, route_index = 0;
> > +
> > + if (!mtk_crtc->conn_route_nr)
> > + return 0;
> > +
> > + priv = priv->all_drm_private[crtc_index];
> > + dev = priv->dev;
> > +
> > + dev_dbg(dev, "connector change:%d, encoder mask0x%x for
> > crtc%d",
> > + crtc_state->connectors_changed, encoder_mask,
> > crtc_index);
> > +
> > + if (!crtc_state->connectors_changed)
> > + return 0;
> > +
> > + conn_routes = mtk_crtc->conn_routes;
> > +
> > + for (i = 0; i < mtk_crtc->conn_route_nr; i++) {
> > + route_len = conn_routes[i].route_len;
> > + if (route_len > 0) {
>
> route_len is unsigned, it can never be < 0, so...
>
> if (route_len) {
>
It's better to use unsigned int.
I'll modify it.
> > + comp_id = conn_routes[i].route_ddp[route_len
> > - 1];
> > + if (priv->comp_node[comp_id]) {
> > + if ((1 << priv-
> > >ddp_comp[comp_id].encoder_index) == encoder_mask) {
>
> This is effectively BIT().
>
> if (encoder_mask == BIT(priv->ddp_comp[comp_id].encoder_index)) {
>
> P.S.: Are you sure that this shouldn't be (encoder_mask &
> BIT(encoder_index))??
>
Yes, encoder_index should be bitwise. I'll fixed it.
> > + route_index = i;
> > + break;
> > + }
> > + }
> > + }
> > + }
> > +
>
> ..snip..
>
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> > b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> > index 3e9046993d09..672b9c7afee6 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 conn_routes_num);
>
> num_conn_routes looks better.
OK, I'll modify it.
>
> > 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 f114da4d36a9..fe20ce26b19f 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
>
> ..snip..
>
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > index febcaeef16a1..1c1d670cfe41 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > @@ -80,6 +80,7 @@ struct mtk_ddp_comp_funcs {
> > void (*disconnect)(struct device *dev, struct device
> > *mmsys_dev, unsigned int next);
> > void (*add)(struct device *dev, struct mtk_mutex *mutex);
> > void (*remove)(struct device *dev, struct mtk_mutex *mutex);
> > + int (*encoder_index)(struct device *dev);
>
> drm_encoder_index returns an unsigned int type, so this one can never
> be negative:
> please change the return value of this function to unsigned int type.
>
OK, I'll modify it.
> > };
> >
> > struct mtk_ddp_comp {
> > @@ -87,6 +88,7 @@ struct mtk_ddp_comp {
> > int irq;
> > unsigned int id;
> > const struct mtk_ddp_comp_funcs *funcs;
> > + int encoder_index;
>
> Same here, unsigned int.
>
OK, I'll modify it.
Regards,
Jason-JH.Lin
> > };
> >
> > static inline int mtk_ddp_comp_clk_enable(struct mtk_ddp_comp
> > *comp)
>
> Regards,
> Angelo
>
>
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