linux-kernel - Re: [PATCH 1/2] drm/panel: visionox-vtdr6130: switch to mipi

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Message-ID: <CAD=FV=Wke51vmTy7zZ+RV7oDoCGSeszOarhLGapdDrkByNyi-g@mail.gmail.com>
Date: Wed, 28 Aug 2024 09:32:05 -0700
From: Doug Anderson <dianders@...omium.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/panel: visionox-vtdr6130: switch to mipi_dsi
 wrapped functions

Hi,

On Wed, Aug 28, 2024 at 9:03 AM Neil Armstrong
<neil.armstrong@...aro.org> wrote:
>
> Make usage of the new _multi() mipi_dsi functions instead of the
> deprecated macros, improving error handling and printing.
>
> bloat-o-meter gives a 12% gain on arm64:
> Function                                     old     new   delta
> visionox_vtdr6130_unprepare                  208     204      -4
> visionox_vtdr6130_prepare                   1192     896    -296
> Total: Before=2348, After=2048, chg -12.78%
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/gpu/drm/panel/panel-visionox-vtdr6130.c | 186 +++++++++++-------------
>  1 file changed, 82 insertions(+), 104 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> index 540099253e1b..ebe92871dbb6 100644
> --- a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> +++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> @@ -40,120 +40,103 @@ static void visionox_vtdr6130_reset(struct visionox_vtdr6130 *ctx)
>  static int visionox_vtdr6130_on(struct visionox_vtdr6130 *ctx)
>  {
>         struct mipi_dsi_device *dsi = ctx->dsi;
> -       struct device *dev = &dsi->dev;
> -       int ret;
> +       struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
>
>         dsi->mode_flags |= MIPI_DSI_MODE_LPM;

This isn't something you introduced in your patch, but I wonder if we
should avoid setting the "MIPI_DSI_MODE_LPM" bit when the function
returns an error?

In any case:

Reviewed-by: Douglas Anderson <dianders@...omium.org>