linux-kernel - Re: [PATCH RFC 2/7] drm/panel: boe-tv101wum-nl6: use wrapped MIPI DCS functions

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Date: Fri, 10 May 2024 14:46:06 -0700
From: Doug Anderson <dianders@...omium.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: 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>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Sam Ravnborg <sam@...nborg.org>, Sumit Semwal <sumit.semwal@...aro.org>, 
	Caleb Connolly <caleb.connolly@...aro.org>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	Vinod Koul <vkoul@...nel.org>, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, 
	cong yang <yangcong5@...qin.corp-partner.google.com>
Subject: Re: [PATCH RFC 2/7] drm/panel: boe-tv101wum-nl6: use wrapped MIPI DCS functions

Hi,

On Thu, May 9, 2024 at 3:37 PM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> Remove conditional code and always use mipi_dsi_dcs_*multi() wrappers to
> simplify driver's init/exit code.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 73 ++++++++------------------
>  1 file changed, 21 insertions(+), 52 deletions(-)

Please CC Cong Yang (CCed here) on your next version since he's also
touching this file and your changes will conflict with his.


> @@ -1508,20 +1483,14 @@ static inline struct boe_panel *to_boe_panel(struct drm_panel *panel)
>
>  static int boe_panel_enter_sleep_mode(struct boe_panel *boe)
>  {
> -       struct mipi_dsi_device *dsi = boe->dsi;
> -       int ret;
> -
> -       dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +       struct mipi_dsi_multi_context ctx = { .dsi = boe->dsi };
>
> -       ret = mipi_dsi_dcs_set_display_off(dsi);
> -       if (ret < 0)
> -               return ret;
> +       boe->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>
> -       ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> -       if (ret < 0)
> -               return ret;
> +       mipi_dsi_dcs_set_display_off_multi(&ctx);
> +       mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);
>
> -       return 0;
> +       return ctx.accum_err;
>  }

nit: since the "multi" functions print errors for you, you can get rid
of the (now duplicate) error print in the caller. I guess if you
really wanted to you could actually just inline
boe_panel_enter_sleep_mode() into its one caller and that would make
it easy to use the "_multi" version of msleep() there...

In any case, I think this looks nice:

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