Re: [PATCH v2 04/11] drm: sun4i: add support for H3's TCON0/1

Jernej Škrabec
2017-06-04T18:46:35Z

Hi,

Dne nedelja, 04. junij 2017 ob 18:01:42 CEST je Icenowy Zheng napisal(a):
> From: Icenowy Zheng <icenowy@aosc.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@aosc.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