linux-kernel - RE: [PATCH v4 11/15] drm: renesas: rz-du: mipi

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Message-ID:
 <TY3PR01MB113463B8B958391E736F65289868F2@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Sun, 4 May 2025 12:52:34 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Prabhakar <prabhakar.csengg@...il.com>, Andrzej Hajda
	<andrzej.hajda@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>, Robert
 Foss <rfoss@...nel.org>, laurent.pinchart
	<laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, Jernej
 Skrabec <jernej.skrabec@...il.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Geert
 Uytterhoeven <geert+renesas@...der.be>, Michael Turquette
	<mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Philipp Zabel
	<p.zabel@...gutronix.de>, Magnus Damm <magnus.damm@...il.com>
CC: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>, Fabrizio Castro
	<fabrizio.castro.jz@...esas.com>, Prabhakar Mahadev Lad
	<prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH v4 11/15] drm: renesas: rz-du: mipi_dsi: Add feature flag
 for 16BPP support

Hi Prabhakar,

Thanks for the patch.

> -----Original Message-----
> From: Prabhakar <prabhakar.csengg@...il.com>
> Sent: 30 April 2025 21:41
> Subject: [PATCH v4 11/15] drm: renesas: rz-du: mipi_dsi: Add feature flag for 16BPP support
> 
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Introduce the `RZ_MIPI_DSI_FEATURE_16BPP` flag in `rzg2l_mipi_dsi_hw_info` to indicate support for
> 16BPP pixel formats. The RZ/V2H(P) SoC supports 16BPP, whereas this feature is missing on the RZ/G2L
> SoC.
> 
> Update the `mipi_dsi_host_attach()` function to check this flag before allowing 16BPP formats. If the
> SoC does not support 16BPP, return an error to prevent incorrect format selection.
> 
> This change enables finer-grained format support control for different SoC variants.
> 
> Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

Cheers,
Biju

> ---
> v3->v4:
> - No changes
> 
> v2->v3:
> - No changes
> 
> v1->v2:
> - Renamed RZ_MIPI_DSI_FEATURE_16BPP
> ---
>  drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-
> du/rzg2l_mipi_dsi.c
> index a4c0dbae4a46..8c7384b95411 100644
> --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> @@ -29,6 +29,7 @@
>  #include "rzg2l_mipi_dsi_regs.h"
> 
>  #define RZ_MIPI_DSI_FEATURE_DPHY_RST	BIT(0)
> +#define RZ_MIPI_DSI_FEATURE_16BPP	BIT(1)
> 
>  struct rzg2l_mipi_dsi;
> 
> @@ -643,8 +644,16 @@ static int rzg2l_mipi_dsi_host_attach(struct mipi_dsi_host *host,
> 
>  	switch (mipi_dsi_pixel_format_to_bpp(device->format)) {
>  	case 24:
> +		break;
>  	case 18:
>  		break;
> +	case 16:
> +		if (!(dsi->info->features & RZ_MIPI_DSI_FEATURE_16BPP)) {
> +			dev_err(dsi->dev, "Unsupported format 0x%04x\n",
> +				device->format);
> +			return -EINVAL;
> +		}
> +		break;
>  	default:
>  		dev_err(dsi->dev, "Unsupported format 0x%04x\n", device->format);
>  		return -EINVAL;
> --
> 2.49.0