linux-kernel - Re: [PATCH v5 3/3] drm/panel : innolux-ej030na and abt-y030xx067a : add .enable and .disable

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Date:   Mon, 21 Mar 2022 14:21:16 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Christophe Branchereau <cbranchereau@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v5 3/3] drm/panel : innolux-ej030na and abt-y030xx067a :
 add .enable and .disable

Hi Christophe,

Le lun., mars 21 2022 at 14:36:51 +0100, Christophe Branchereau 
<cbranchereau@...il.com> a écrit :
> Following the introduction of bridge_atomic_enable in the ingenic
> drm driver, the crtc is enabled between .prepare and .enable, if
> it exists.
> 
> Add it so the backlight is only enabled after the crtc is, to avoid
> graphical issues.
> 
> Signed-off-by: Christophe Branchereau <cbranchereau@...il.com>

Didn't Sam acked it?

> ---
>  drivers/gpu/drm/panel/panel-abt-y030xx067a.c  | 31 
> +++++++++++++++++--
>  drivers/gpu/drm/panel/panel-innolux-ej030na.c | 31 
> ++++++++++++++++---
>  2 files changed, 55 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-abt-y030xx067a.c 
> b/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> index f043b484055b..ddfacaeac1d4 100644
> --- a/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> +++ b/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> @@ -140,7 +140,7 @@ static const struct reg_sequence 
> y030xx067a_init_sequence[] = {
>  	{ 0x03, REG03_VPOSITION(0x0a) },
>  	{ 0x04, REG04_HPOSITION1(0xd2) },
>  	{ 0x05, REG05_CLIP | REG05_NVM_VREFRESH | REG05_SLBRCHARGE(0x2) },
> -	{ 0x06, REG06_XPSAVE | REG06_NT },
> +	{ 0x06, REG06_NT },
>  	{ 0x07, 0 },
>  	{ 0x08, REG08_PANEL(0x1) | REG08_CLOCK_DIV(0x2) },
>  	{ 0x09, REG09_SUB_BRIGHT_R(0x20) },
> @@ -183,8 +183,6 @@ static int y030xx067a_prepare(struct drm_panel 
> *panel)
>  		goto err_disable_regulator;
>  	}
> 
> -	msleep(120);
> -
>  	return 0;
> 
>  err_disable_regulator:
> @@ -202,6 +200,30 @@ static int y030xx067a_unprepare(struct drm_panel 
> *panel)
>  	return 0;
>  }
> 
> +static int y030xx067a_enable(struct drm_panel *panel)
> +{
> +
> +	struct y030xx067a *priv = to_y030xx067a(panel);
> +
> +	regmap_set_bits(priv->map, 0x06, REG06_XPSAVE);
> +
> +	if (panel->backlight) {
> +		/* Wait for the picture to be ready before enabling backlight */
> +		msleep(120);
> +	}
> +
> +	return 0;
> +}
> +
> +static int y030xx067a_disable(struct drm_panel *panel)
> +{
> +	struct y030xx067a *priv = to_y030xx067a(panel);
> +
> +	regmap_clear_bits(priv->map, 0x06, REG06_XPSAVE);
> +
> +	return 0;
> +}
> +
>  static int y030xx067a_get_modes(struct drm_panel *panel,
>  				struct drm_connector *connector)
>  {
> @@ -239,6 +261,8 @@ static int y030xx067a_get_modes(struct drm_panel 
> *panel,
>  static const struct drm_panel_funcs y030xx067a_funcs = {
>  	.prepare	= y030xx067a_prepare,
>  	.unprepare	= y030xx067a_unprepare,
> +	.enable		= y030xx067a_enable,
> +	.disable	= y030xx067a_disable,
>  	.get_modes	= y030xx067a_get_modes,
>  };
> 
> @@ -246,6 +270,7 @@ static const struct regmap_config 
> y030xx067a_regmap_config = {
>  	.reg_bits = 8,
>  	.val_bits = 8,
>  	.max_register = 0x15,
> +	.cache_type = REGCACHE_FLAT,

I understand that this is added because the panel registers are 
write-only and read as zero, and it is needed for 
regmap_{clear,set}_bits to work.

This information should definitely be added to the commit message.

If you can add it inline here, and I'll update the commit message when 
applying the patch.

Cheers,
-Paul

>  };
> 
>  static int y030xx067a_probe(struct spi_device *spi)
> diff --git a/drivers/gpu/drm/panel/panel-innolux-ej030na.c 
> b/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> index c558de3f99be..6de7370185cd 100644
> --- a/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> +++ b/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> @@ -80,8 +80,6 @@ static const struct reg_sequence 
> ej030na_init_sequence[] = {
>  	{ 0x47, 0x08 },
>  	{ 0x48, 0x0f },
>  	{ 0x49, 0x0f },
> -
> -	{ 0x2b, 0x01 },
>  };
> 
>  static int ej030na_prepare(struct drm_panel *panel)
> @@ -109,8 +107,6 @@ static int ej030na_prepare(struct drm_panel 
> *panel)
>  		goto err_disable_regulator;
>  	}
> 
> -	msleep(120);
> -
>  	return 0;
> 
>  err_disable_regulator:
> @@ -128,6 +124,31 @@ static int ej030na_unprepare(struct drm_panel 
> *panel)
>  	return 0;
>  }
> 
> +static int ej030na_enable(struct drm_panel *panel)
> +{
> +	struct ej030na *priv = to_ej030na(panel);
> +
> +	/* standby off */
> +	regmap_write(priv->map, 0x2b, 0x01);
> +
> +	if (panel->backlight) {
> +		/* Wait for the picture to be ready before enabling backlight */
> +		msleep(120);
> +	}
> +
> +	return 0;
> +}
> +
> +static int ej030na_disable(struct drm_panel *panel)
> +{
> +	struct ej030na *priv = to_ej030na(panel);
> +
> +	/* standby on */
> +	regmap_write(priv->map, 0x2b, 0x00);
> +
> +	return 0;
> +}
> +
>  static int ej030na_get_modes(struct drm_panel *panel,
>  			     struct drm_connector *connector)
>  {
> @@ -165,6 +186,8 @@ static int ej030na_get_modes(struct drm_panel 
> *panel,
>  static const struct drm_panel_funcs ej030na_funcs = {
>  	.prepare	= ej030na_prepare,
>  	.unprepare	= ej030na_unprepare,
> +	.enable		= ej030na_enable,
> +	.disable	= ej030na_disable,
>  	.get_modes	= ej030na_get_modes,
>  };
> 
> --
> 2.35.1
>