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Date:   Sun, 04 Jun 2017 20:46:24 +0200
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.xyz>
Subject: Re: [PATCH v2 04/11] drm: sun4i: add support for H3's TCON0/1

Hi,

Dne nedelja, 04. junij 2017 ob 18:01:42 CEST je Icenowy Zheng napisal(a):
> From: Icenowy Zheng <icenowy@...c.xyz>
> 
> Allwinner H3 has two special TCONs, both come without channel0. And the
> TCON1 of H3 has no special clocks even for the channel1.
> 
> Add support for these kinds of TCON.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
> Changes in v2:
> - Merged TCON0 and TCON1 quirks and compatibles.
> 
>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 52
> +++++++++++++++++++++++++------------- drivers/gpu/drm/sun4i/sun4i_tcon.h |
>  1 +
>  2 files changed, 36 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 568cea0e5f8f..62ba4fc19f18
> 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -59,6 +59,7 @@ void sun4i_tcon_channel_disable(struct sun4i_tcon *tcon,
> int channel)
> 
>  	/* Disable the TCON's channel */
>  	if (channel == 0) {
> +		WARN_ON(!tcon->quirks->has_channel_0);
>  		regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
>  				   SUN4I_TCON0_CTL_TCON_ENABLE, 0);
>  		clk_disable_unprepare(tcon->dclk);
> @@ -78,6 +79,7 @@ void sun4i_tcon_channel_enable(struct sun4i_tcon *tcon,
> int channel)
> 
>  	/* Enable the TCON's channel */
>  	if (channel == 0) {
> +		WARN_ON(!tcon->quirks->has_channel_0);
>  		regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
>  				   SUN4I_TCON0_CTL_TCON_ENABLE,
>  				   SUN4I_TCON0_CTL_TCON_ENABLE);
> @@ -159,6 +161,7 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
> 
>  	/* Configure the dot clock */
>  	clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
> +	WARN_ON(!tcon->quirks->has_channel_0);
> 
>  	/* Adjust clock delay */
>  	clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
> @@ -366,10 +369,12 @@ static int sun4i_tcon_init_clocks(struct device *dev,
>  	}
>  	clk_prepare_enable(tcon->clk);
> 
> -	tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
> -	if (IS_ERR(tcon->sclk0)) {
> -		dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
> -		return PTR_ERR(tcon->sclk0);
> +	if (tcon->quirks->has_channel_0) {
> +		tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
> +		if (IS_ERR(tcon->sclk0)) {
> +			dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
> +			return PTR_ERR(tcon->sclk0);
> +		}
>  	}
> 
>  	if (tcon->quirks->has_channel_1) {
> @@ -594,10 +599,12 @@ static int sun4i_tcon_bind(struct device *dev, struct
> device *master, goto err_free_clocks;
>  	}
> 
> -	ret = sun4i_dclk_create(dev, tcon);
> -	if (ret) {
> -		dev_err(dev, "Couldn't create our TCON dot clock\n");
> -		goto err_free_clocks;
> +	if (tcon->quirks->has_channel_0) {
> +		ret = sun4i_dclk_create(dev, tcon);
> +		if (ret) {
> +			dev_err(dev, "Couldn't create our TCON dot clock\n");
> +			goto err_free_clocks;
> +		}
>  	}
> 
>  	ret = sun4i_tcon_init_irq(dev, tcon);
> @@ -622,7 +629,8 @@ static int sun4i_tcon_bind(struct device *dev, struct
> device *master, return 0;
> 
>  err_free_dotclock:
> -	sun4i_dclk_free(tcon);
> +	if (tcon->quirks->has_channel_0)
> +		sun4i_dclk_free(tcon);
>  err_free_clocks:
>  	sun4i_tcon_free_clocks(tcon);
>  err_assert_reset:
> @@ -636,7 +644,9 @@ static void sun4i_tcon_unbind(struct device *dev, struct
> device *master, struct sun4i_tcon *tcon = dev_get_drvdata(dev);
> 
>  	list_del(&tcon->list);
> -	sun4i_dclk_free(tcon);
> +
> +	if (tcon->quirks->has_channel_0)
> +		sun4i_dclk_free(tcon);
>  	sun4i_tcon_free_clocks(tcon);
>  }
> 
> @@ -667,24 +677,32 @@ static int sun4i_tcon_remove(struct platform_device
> *pdev) }
> 
>  static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
> -	.has_unknown_mux = true,
> -	.has_channel_1	= true,
> +	.has_unknown_mux	= true,
> +	.has_channel_0		= true,
> +	.has_channel_1		= true,
>  };
> 
>  static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
> -	.has_channel_1	= true,
> +	.has_channel_0		= true,
> +	.has_channel_1		= true,
>  };
> 
>  static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
> -	.has_channel_1	= true,
> +	.has_channel_0		= true,
> +	.has_channel_1		= true,
>  };
> 
>  static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
> -	/* nothing is supported */
> +	.has_channel_0	= true,
>  };
> 
>  static const struct sun4i_tcon_quirks sun8i_v3s_quirks = {
> -	/* nothing is supported */
> +	.has_channel_0	= true,
> +};
> +
> +static const struct sun4i_tcon_quirks sun8i_h3_quirks = {
> +	.has_channel_1		= true,
> +	.swappable_input	= true,
>  };
> 
>  static const struct of_device_id sun4i_tcon_of_table[] = {
> @@ -693,7 +711,7 @@ static const struct of_device_id sun4i_tcon_of_table[] =
> { { .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks
> }, { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
> { .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks },
> -	{ }
> +	{ .compatible = "allwinner,sun8i-h3-tcon", .data = &sun8i_h3_quirks },

I think you need to leave empty entry as a sentinel.

>  };
>  MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table);
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h
> b/drivers/gpu/drm/sun4i/sun4i_tcon.h index c3e01c06e9a0..9c706a0bd478
> 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
> @@ -145,6 +145,7 @@
> 
>  struct sun4i_tcon_quirks {
>  	bool	has_unknown_mux; /* sun5i has undocumented mux */
> +	bool	has_channel_0;	/* some A83T+ TCONs don't have channel 0*/
>  	bool	has_channel_1;	/* a33 does not have channel 1 */
>  	/* Some DE2 can swap the mixer<->TCON connection */
>  	bool	swappable_input;
> --
> 2.12.2

You missed sun4i_rgb_init() function which should also be guarded with "if 
(tcon->quirks->has_channel_0)".

You should also expand function sun4i_drv_node_is_tcon() at sun4i_drv.c with 
new entries, but I'm not sure if this fits in this patch.

Best regards,
Jernej


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