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SubjectRe: [PATCH v2 2/2] ARM: sun7i: dts: Add LVDS panel support on A20
On Mon, Feb 17, 2020 at 06:51:35PM +0100, Maxime Ripard wrote:
> > diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
> > index cfbf4e6c1679..bc87d28ee341 100644
> > --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
> > +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
> > @@ -235,6 +235,8 @@ struct sun4i_tcon_quirks {
> > bool needs_de_be_mux; /* sun6i needs mux to select backend */
> > bool needs_edp_reset; /* a80 edp reset needed for tcon0 access */
> > bool supports_lvds; /* Does the TCON support an LVDS output? */
> > + /* "compatible" string of TCON that exclusively supports LVDS */
> > + const char *lvds_compatible_tcon;
>
> However this is far more complicated than needed, you can simply add a
> new quirks structure associated to the tcon0 compatible in
> sun4i_tcon_of_table, and that will do

Aha! Does this look good to you?

From 4ad2978e404c63d4cca1b7890bc5bdd4d1e8965d Mon Sep 17 00:00:00 2001
From: Andrey Lebedev <andrey@lebedev.lt>
Date: Tue, 18 Feb 2020 19:47:33 +0200
Subject: [PATCH] Mark tcon0 to be the only tcon capable of LVDS on sun7i-a20

This allows to avoid warnings about reset line not provided for tcon1.

Signed-off-by: Andrey Lebedev <andrey@lebedev.lt>
---
arch/arm/boot/dts/sun7i-a20.dtsi | 6 ++++--
drivers/gpu/drm/sun4i/sun4i_tcon.c | 14 ++++++++++++--
2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
index dc4f3f249aee..d50263c1ca9a 100644
--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -405,7 +405,8 @@
};

tcon0: lcd-controller@1c0c000 {
- compatible = "allwinner,sun7i-a20-tcon";
+ compatible = "allwinner,sun7i-a20-tcon0",
+ "allwinner,sun7i-a20-tcon";
reg = <0x01c0c000 0x1000>;
interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
resets = <&ccu RST_TCON0>, <&ccu RST_LVDS>;
@@ -460,7 +461,8 @@
};

tcon1: lcd-controller@1c0d000 {
- compatible = "allwinner,sun7i-a20-tcon";
+ compatible = "allwinner,sun7i-a20-tcon1",
+ "allwinner,sun7i-a20-tcon";
reg = <0x01c0d000 0x1000>;
interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
resets = <&ccu RST_TCON1>;
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 800a9bd86112..d9605d331010 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -1479,7 +1479,7 @@ static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
.dclk_min_div = 1,
};

-static const struct sun4i_tcon_quirks sun7i_a20_quirks = {
+static const struct sun4i_tcon_quirks sun7i_a20_tcon0_quirks = {
.supports_lvds = true,
.has_channel_0 = true,
.has_channel_1 = true,
@@ -1489,6 +1489,15 @@ static const struct sun4i_tcon_quirks sun7i_a20_quirks = {
.setup_lvds_phy = sun4i_tcon_setup_lvds_phy,
};

+static const struct sun4i_tcon_quirks sun7i_a20_tcon1_quirks = {
+ .supports_lvds = false,
+ .has_channel_0 = true,
+ .has_channel_1 = true,
+ .dclk_min_div = 4,
+ /* Same display pipeline structure as A10 */
+ .set_mux = sun4i_a10_tcon_set_mux,
+};
+
static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
.has_channel_0 = true,
.has_lvds_alt = true,
@@ -1534,7 +1543,8 @@ const struct of_device_id sun4i_tcon_of_table[] = {
{ .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks },
{ .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
{ .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
- { .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks },
+ { .compatible = "allwinner,sun7i-a20-tcon0", .data = &sun7i_a20_tcon0_quirks },
+ { .compatible = "allwinner,sun7i-a20-tcon1", .data = &sun7i_a20_tcon1_quirks },
{ .compatible = "allwinner,sun8i-a23-tcon", .data = &sun8i_a33_quirks },
{ .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
{ .compatible = "allwinner,sun8i-a83t-tcon-lcd", .data = &sun8i_a83t_lcd_quirks },
--
2.20.1

--
Andrey Lebedev aka -.- . -.. -.. . .-.
Software engineer
Homepage: http://lebedev.lt/

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