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From: daniel@ffwll.ch
Cc: Daniel Thompson <daniel.thompson@linaro.org>,
	Jingoo Han <jingoohan1@gmail.com>,
	dri-devel@lists.freedesktop.org,
	Thierry Reding <thierry.reding@gmail.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Robert Chiras <robert.chiras@nxp.com>,
	Lee Jones <lee.jones@linaro.org>
Subject: Re: [PATCH v1 10/22] drm/panel: raydium-rm67191: Backlight update
Date: Tue, 4 Aug 2020 19:04:11 +0200
Message-ID: <20200804170411.GO6419@phenom.ffwll.local> (raw)
In-Reply-To: <20200802110636.1018743-11-sam@ravnborg.org>

On Sun, Aug 02, 2020 at 01:06:24PM +0200, Sam Ravnborg wrote:
> - Replace direct access to backlight_properties with
>   backlight_get_brightness().
> - Use macro for initialization
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Cc: Robert Chiras <robert.chiras@nxp.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> ---
>  drivers/gpu/drm/panel/panel-raydium-rm67191.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-raydium-rm67191.c b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
> index 313637d53d28..5553db385dd5 100644
> --- a/drivers/gpu/drm/panel/panel-raydium-rm67191.c
> +++ b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
> @@ -479,7 +479,7 @@ static int rad_bl_get_brightness(struct backlight_device *bl)
>  	if (ret < 0)
>  		return ret;
>  
> -	bl->props.brightness = brightness;
> +	backlight_set_brightness(bl, brightness);

This sounds like a bad idea, again because this overrides the software
brightness value potentially when the backlight is off. Althought that's
checked a bit higher up, so not too terrible.

I'm also feeling like a helper for standard mipi dsi panel backlight would
be great, it's pretty much all the same code.
-Daniel

>  
>  	return brightness & 0xff;
>  }
> @@ -495,7 +495,7 @@ static int rad_bl_update_status(struct backlight_device *bl)
>  
>  	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>  
> -	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
> +	ret = mipi_dsi_dcs_set_display_brightness(dsi, backlight_get_brightness(bl));
>  	if (ret < 0)
>  		return ret;
>  
> @@ -539,10 +539,10 @@ static int rad_init_regulators(struct rad_panel *rad)
>  
>  static int rad_panel_probe(struct mipi_dsi_device *dsi)
>  {
> +	DECLARE_BACKLIGHT_INIT_RAW(bl_props, 255, 255);
>  	struct device *dev = &dsi->dev;
>  	struct device_node *np = dev->of_node;
>  	struct rad_panel *panel;
> -	struct backlight_properties bl_props;
>  	int ret;
>  	u32 video_mode;
>  
> @@ -588,11 +588,6 @@ static int rad_panel_probe(struct mipi_dsi_device *dsi)
>  	if (IS_ERR(panel->reset))
>  		return PTR_ERR(panel->reset);
>  
> -	memset(&bl_props, 0, sizeof(bl_props));
> -	bl_props.type = BACKLIGHT_RAW;
> -	bl_props.brightness = 255;
> -	bl_props.max_brightness = 255;
> -
>  	panel->backlight = devm_backlight_device_register(dev, dev_name(dev),
>  							  dev, dsi, &rad_bl_ops,
>  							  &bl_props);
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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  reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-02 11:06 [RFC PATCH v1 0/22] backlight: add init macros and accessors Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 01/22] backlight: Silently fail backlight_update_status() if no device Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 02/22] backlight: Add DECLARE_* macro for device registration Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 03/22] backlight: Add get/set operations for brightness/power properties Sam Ravnborg
2020-08-04 16:43   ` daniel
2020-08-04 19:56     ` Sam Ravnborg
2020-08-05  7:16       ` daniel
2020-08-02 11:06 ` [PATCH v1 04/22] backlight: gpio: Use DECLARE_BACKLIGHT_INIT_RAW and get/setters Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 05/22] drm/gma500: Backlight support Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 06/22] drm/panel: asus-z00t-tm5p5-n35596: Backlight update Sam Ravnborg
2020-08-04 16:59   ` daniel
2020-08-02 11:06 ` [PATCH v1 07/22] drm/panel: jdi-lt070me05000: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 08/22] drm/panel: novatek-nt35510: " Sam Ravnborg
2020-08-04 21:29   ` Linus Walleij
2020-08-02 11:06 ` [PATCH v1 09/22] drm/panel: orisetech-otm8009a: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 10/22] drm/panel: raydium-rm67191: " Sam Ravnborg
2020-08-04 17:04   ` daniel [this message]
2020-08-02 11:06 ` [PATCH v1 11/22] drm/panel: samsung-s6e63m0: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 12/22] drm/panel: samsung-s6e63j0x03: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 13/22] drm/panel: samsung-s6e3ha2: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 14/22] drm/panel: sony-acx424akp: " Sam Ravnborg
2020-08-04 21:31   ` Linus Walleij
2020-08-02 11:06 ` [PATCH v1 15/22] drm/panel: sony-acx565akm: " Sam Ravnborg
2020-08-04 17:09   ` daniel
2020-08-02 11:06 ` [PATCH v1 16/22] drm/bridge: parade-ps8622: " Sam Ravnborg
2020-08-02 14:05   ` kernel test robot
2020-08-02 14:32   ` Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 17/22] drm/tilcdc: " Sam Ravnborg
2020-08-02 13:21   ` kernel test robot
2020-08-02 11:06 ` [PATCH v1 18/22] drm/radeon: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 19/22] drm/amdgpu/atom: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 20/22] drm/i915: " Sam Ravnborg
2020-08-02 11:06 ` [PATCH v1 21/22] drm/omap: display: " Sam Ravnborg
2020-08-02 14:26   ` Sebastian Reichel
2020-08-02 14:32     ` Sam Ravnborg
2020-08-02 22:48       ` Sebastian Reichel
2020-08-02 11:06 ` [PATCH v1 22/22] drm/shmobile: " Sam Ravnborg
2020-08-04 16:51 ` [RFC PATCH v1 0/22] backlight: add init macros and accessors daniel

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