[PATCH v2] fbdev: atmel_lcdfb: Rework backlight status updates

[Sam Ravnborg]

Hi Stephen, thanks!
On Thu, Jun 09, 2022 at 08:04:40PM +0200, Stephen Kitt wrote:
> Instead of checking the state of various backlight_properties fields
> against the memorised state in atmel_lcdfb_info.bl_power,
> atmel_bl_update_status() should retrieve the desired state using
> backlight_get_brightness (which takes into account the power state,
> blanking etc.). This means the explicit checks using props.fb_blank
> and props.power can be dropped.
> 
> The backlight framework ensures that backlight is never negative, so
> the test before reading the brightness from the hardware always ends
> up false and the whole block can be removed. The framework retrieves
> the brightness from the hardware through atmel_bl_get_brightness()
> when necessary.
> 
> As a result, bl_power in struct atmel_lcdfb_info is no longer
> necessary, so remove that while we're at it. Since we only ever care
> about reading the current state in backlight_properties, drop the
> updates at the end of the function.
> 
> Signed-off-by: Stephen Kitt <steve at sk2.org>
> Cc: Nicolas Ferre <nicolas.ferre at microchip.com>
> Cc: Helge Deller <deller at gmx.de>
> Cc: Alexandre Belloni <alexandre.belloni at bootlin.com>
> Cc: Claudiu Beznea <claudiu.beznea at microchip.com>
> Cc: linux-fbdev at vger.kernel.org
> Cc: dri-devel at lists.freedesktop.org
> Cc: linux-arm-kernel at lists.infradead.org
Acked-by: Sam Ravnborg <sam at ravnborg.org>

	Sam