[v4] Add GCE support for MT8196

[PATCH v4 7/8] drm/mediatek: Add programming flow for unsupported subsys ID hardware

Posted by Jason-JH Lin 7 months, 2 weeks ago

To support hardware without subsys IDs on new SoCs, add a programming
flow that checks whether the subsys ID is valid. If the subsys ID is
invalid, the flow will call 2 alternative CMDQ APIs:
cmdq_pkt_assign() and cmdq_pkt_write_s_value() to achieve the same
functionality.

Signed-off-by: Jason-JH Lin <jason-jh.lin@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 33 ++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
index edc6417639e6..219d67735a54 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
@@ -66,14 +66,37 @@ struct mtk_ddp_comp_dev {
 	struct cmdq_client_reg cmdq_reg;
 };
 
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+static void mtk_ddp_write_cmdq_pkt(struct cmdq_pkt *cmdq_pkt, struct cmdq_client_reg *cmdq_reg,
+				   unsigned int offset, unsigned int value, unsigned int mask)
+{
+	offset += cmdq_reg->offset;
+
+	if (cmdq_reg->subsys != CMDQ_SUBSYS_INVALID) {
+		if (mask == GENMASK(31, 0))
+			cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys, offset, value);
+		else
+			cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg->subsys, offset, value, mask);
+	} else {
+		/* only MMIO access, no need to check mminfro_offset */
+		cmdq_pkt_assign(cmdq_pkt, 0, CMDQ_ADDR_HIGH(cmdq_reg->pa_base));
+		if (mask == GENMASK(31, 0))
+			cmdq_pkt_write_s_value(cmdq_pkt, CMDQ_THR_SPR_IDX0,
+					       CMDQ_ADDR_LOW(offset), value);
+		else
+			cmdq_pkt_write_s_mask_value(cmdq_pkt, CMDQ_THR_SPR_IDX0,
+						    CMDQ_ADDR_LOW(offset), value, mask);
+	}
+}
+#endif
+
 void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value,
 		   struct cmdq_client_reg *cmdq_reg, void __iomem *regs,
 		   unsigned int offset)
 {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (cmdq_pkt)
-		cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
-			       cmdq_reg->offset + offset, value);
+		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, GENMASK(31, 0));
 	else
 #endif
 		writel(value, regs + offset);
@@ -85,8 +108,7 @@ void mtk_ddp_write_relaxed(struct cmdq_pkt *cmdq_pkt, unsigned int value,
 {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (cmdq_pkt)
-		cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
-			       cmdq_reg->offset + offset, value);
+		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, GENMASK(31, 0));
 	else
 #endif
 		writel_relaxed(value, regs + offset);
@@ -98,8 +120,7 @@ void mtk_ddp_write_mask(struct cmdq_pkt *cmdq_pkt, unsigned int value,
 {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (cmdq_pkt) {
-		cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg->subsys,
-				    cmdq_reg->offset + offset, value, mask);
+		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, mask);
 	} else {
 #endif
 		u32 tmp = readl(regs + offset);
-- 
2.43.0

Re: [PATCH v4 7/8] drm/mediatek: Add programming flow for unsupported subsys ID hardware

Posted by AngeloGioacchino Del Regno 6 months, 4 weeks ago

Il 18/02/25 06:41, Jason-JH Lin ha scritto:
> To support hardware without subsys IDs on new SoCs, add a programming
> flow that checks whether the subsys ID is valid. If the subsys ID is
> invalid, the flow will call 2 alternative CMDQ APIs:
> cmdq_pkt_assign() and cmdq_pkt_write_s_value() to achieve the same
> functionality.
> 
> Signed-off-by: Jason-JH Lin <jason-jh.lin@mediatek.com>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 33 ++++++++++++++++++++-----
>   1 file changed, 27 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> index edc6417639e6..219d67735a54 100644
> --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> @@ -66,14 +66,37 @@ struct mtk_ddp_comp_dev {
>   	struct cmdq_client_reg cmdq_reg;
>   };
>   
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +static void mtk_ddp_write_cmdq_pkt(struct cmdq_pkt *cmdq_pkt, struct cmdq_client_reg *cmdq_reg,
> +				   unsigned int offset, unsigned int value, unsigned int mask)
> +{
> +	offset += cmdq_reg->offset;
> +
> +	if (cmdq_reg->subsys != CMDQ_SUBSYS_INVALID) {
> +		if (mask == GENMASK(31, 0))
> +			cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys, offset, value);
> +		else
> +			cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg->subsys, offset, value, mask);

Sorry but this is pointless, really...

Function cmdq_pkt_write_mask() in mtk-cmdq-helper is doing:

	if (mask != GENMASK(31, 0)) {
		err = cmdq_pkt_mask(pkt, mask);
		if (err < 0)
			return err;

		offset_mask |= CMDQ_WRITE_ENABLE_MASK;
	}
	return cmdq_pkt_write(pkt, subsys, offset_mask, value);

here you're doing the exact inverse check.

At this point you can just do:

static int mtk_ddp_write_cmdq_pkt(struct cmdq_pkt *cmdq_pkt, struct cmdq_client_reg 
*cmdq_reg,
				  u16 offset, u32 value, u32 mask)
{
	u16 gce_offset = cmdq_reg->offset + offset;

	if (cmdq_reg->subsys != CMDQ_SUBSYS_INVALID)
		return cmdq_pkt_write_mask(pkt, cmdq_reg->subsys, gce_offset, value, mask);

	return cmdq_pkt_write_mask_pa(cmdq_pkt, cmdq_reg->pa_base, gce_offset, value, mask);
}

Cheers,
Angelo

> +	} else {
> +		/* only MMIO access, no need to check mminfro_offset */
> +		cmdq_pkt_assign(cmdq_pkt, 0, CMDQ_ADDR_HIGH(cmdq_reg->pa_base));
> +		if (mask == GENMASK(31, 0))
> +			cmdq_pkt_write_s_value(cmdq_pkt, CMDQ_THR_SPR_IDX0,
> +					       CMDQ_ADDR_LOW(offset), value);
> +		else
> +			cmdq_pkt_write_s_mask_value(cmdq_pkt, CMDQ_THR_SPR_IDX0,
> +						    CMDQ_ADDR_LOW(offset), value, mask);
> +	}
> +}
> +#endif
> +
>   void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value,
>   		   struct cmdq_client_reg *cmdq_reg, void __iomem *regs,
>   		   unsigned int offset)
>   {
>   #if IS_REACHABLE(CONFIG_MTK_CMDQ)
>   	if (cmdq_pkt)
> -		cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
> -			       cmdq_reg->offset + offset, value);
> +		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, GENMASK(31, 0));
>   	else
>   #endif
>   		writel(value, regs + offset);
> @@ -85,8 +108,7 @@ void mtk_ddp_write_relaxed(struct cmdq_pkt *cmdq_pkt, unsigned int value,
>   {
>   #if IS_REACHABLE(CONFIG_MTK_CMDQ)
>   	if (cmdq_pkt)
> -		cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
> -			       cmdq_reg->offset + offset, value);
> +		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, GENMASK(31, 0));
>   	else
>   #endif
>   		writel_relaxed(value, regs + offset);
> @@ -98,8 +120,7 @@ void mtk_ddp_write_mask(struct cmdq_pkt *cmdq_pkt, unsigned int value,
>   {
>   #if IS_REACHABLE(CONFIG_MTK_CMDQ)
>   	if (cmdq_pkt) {
> -		cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg->subsys,
> -				    cmdq_reg->offset + offset, value, mask);
> +		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, mask);
>   	} else {
>   #endif
>   		u32 tmp = readl(regs + offset);

Re: [PATCH v4 7/8] drm/mediatek: Add programming flow for unsupported subsys ID hardware

Posted by Jason-JH Lin (林睿祥) 6 months, 4 weeks ago

On Thu, 2025-03-06 at 10:47 +0100, AngeloGioacchino Del Regno wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> Il 18/02/25 06:41, Jason-JH Lin ha scritto:
> > To support hardware without subsys IDs on new SoCs, add a
> > programming
> > flow that checks whether the subsys ID is valid. If the subsys ID
> > is
> > invalid, the flow will call 2 alternative CMDQ APIs:
> > cmdq_pkt_assign() and cmdq_pkt_write_s_value() to achieve the same
> > functionality.
> > 
> > Signed-off-by: Jason-JH Lin <jason-jh.lin@mediatek.com>
> > Reviewed-by: CK Hu <ck.hu@mediatek.com>
> > ---
> >   drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 33
> > ++++++++++++++++++++-----
> >   1 file changed, 27 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> > b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> > index edc6417639e6..219d67735a54 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> > @@ -66,14 +66,37 @@ struct mtk_ddp_comp_dev {
> >       struct cmdq_client_reg cmdq_reg;
> >   };
> > 
> > +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> > +static void mtk_ddp_write_cmdq_pkt(struct cmdq_pkt *cmdq_pkt,
> > struct cmdq_client_reg *cmdq_reg,
> > +                                unsigned int offset, unsigned int
> > value, unsigned int mask)
> > +{
> > +     offset += cmdq_reg->offset;
> > +
> > +     if (cmdq_reg->subsys != CMDQ_SUBSYS_INVALID) {
> > +             if (mask == GENMASK(31, 0))
> > +                     cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
> > offset, value);
> > +             else
> > +                     cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg-
> > >subsys, offset, value, mask);
> 
> Sorry but this is pointless, really...
> 
> Function cmdq_pkt_write_mask() in mtk-cmdq-helper is doing:
> 
>         if (mask != GENMASK(31, 0)) {
>                 err = cmdq_pkt_mask(pkt, mask);
>                 if (err < 0)
>                         return err;
> 
>                 offset_mask |= CMDQ_WRITE_ENABLE_MASK;
>         }
>         return cmdq_pkt_write(pkt, subsys, offset_mask, value);
> 
> here you're doing the exact inverse check.
> 

Oh, I didn't notice that it was redundant. Thanks.

> At this point you can just do:
> 
> static int mtk_ddp_write_cmdq_pkt(struct cmdq_pkt *cmdq_pkt, struct
> cmdq_client_reg
> *cmdq_reg,
>                                   u16 offset, u32 value, u32 mask)
> {
>         u16 gce_offset = cmdq_reg->offset + offset;
> 
>         if (cmdq_reg->subsys != CMDQ_SUBSYS_INVALID)
>                 return cmdq_pkt_write_mask(pkt, cmdq_reg->subsys,
> gce_offset, value, mask);
> 
>         return cmdq_pkt_write_mask_pa(cmdq_pkt, cmdq_reg->pa_base,
> gce_offset, value, mask);
> }
> 

I'll change like this, Thanks!

Regards,
Jason-JH Lin

> Cheers,
> Angelo