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Date: Mon, 14 Feb 2022 10:24:05 +0000
From: Paul Cercueil <paul@...pouillou.net>
To: "H. Nikolaus Schaller" <hns@...delico.com>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
Paul Boddie <paul@...die.org.uk>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Maxime Ripard <maxime@...no.tech>,
Harry Wentland <harry.wentland@....com>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-mips@...r.kernel.org,
letux-kernel@...nphoenux.org,
Ezequiel Garcia <ezequiel@...labora.com>
Subject: Re: [PATCH v15 2/7] drm/ingenic: Add dw-hdmi driver specialization
for jz4780
Hi,
Le sam., févr. 12 2022 at 16:50:50 +0100, H. Nikolaus Schaller
<hns@...delico.com> a écrit :
> From: Paul Boddie <paul@...die.org.uk>
>
> A specialisation of the generic Synopsys HDMI driver is employed for
> JZ4780 HDMI support. This requires a new driver, plus device tree and
> configuration modifications.
>
> Here we add Kconfig DRM_INGENIC_DW_HDMI, Makefile and driver code.
>
> Signed-off-by: Paul Boddie <paul@...die.org.uk>
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
> drivers/gpu/drm/ingenic/Kconfig | 9 ++
> drivers/gpu/drm/ingenic/Makefile | 1 +
> drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c | 104
> ++++++++++++++++++++++
> 3 files changed, 114 insertions(+)
> create mode 100644 drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
>
> diff --git a/drivers/gpu/drm/ingenic/Kconfig
> b/drivers/gpu/drm/ingenic/Kconfig
> index 001f59fb06d56..090830bcbde7f 100644
> --- a/drivers/gpu/drm/ingenic/Kconfig
> +++ b/drivers/gpu/drm/ingenic/Kconfig
> @@ -24,4 +24,13 @@ config DRM_INGENIC_IPU
>
> The Image Processing Unit (IPU) will appear as a second primary
> plane.
>
> +config DRM_INGENIC_DW_HDMI
> + tristate "Ingenic specific support for Synopsys DW HDMI"
> + depends on MACH_JZ4780
> + select DRM_DW_HDMI
> + help
> + Choose this option to enable Synopsys DesignWare HDMI based
> driver.
> + If you want to enable HDMI on Ingenic JZ4780 based SoC, you should
> + select this option.
> +
> endif
> diff --git a/drivers/gpu/drm/ingenic/Makefile
> b/drivers/gpu/drm/ingenic/Makefile
> index d313326bdddbb..f10cc1c5a5f22 100644
> --- a/drivers/gpu/drm/ingenic/Makefile
> +++ b/drivers/gpu/drm/ingenic/Makefile
> @@ -1,3 +1,4 @@
> obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
> ingenic-drm-y = ingenic-drm-drv.o
> ingenic-drm-$(CONFIG_DRM_INGENIC_IPU) += ingenic-ipu.o
> +obj-$(CONFIG_DRM_INGENIC_DW_HDMI) += ingenic-dw-hdmi.o
> diff --git a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
> b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
> new file mode 100644
> index 0000000000000..34e986dd606cf
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
> @@ -0,0 +1,104 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
> + * Copyright (C) 2019, 2020 Paul Boddie <paul@...die.org.uk>
> + *
> + * Derived from dw_hdmi-imx.c with i.MX portions removed.
> + * Probe and remove operations derived from rcar_dw_hdmi.c.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#include <drm/bridge/dw_hdmi.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_print.h>
> +
> +static const struct dw_hdmi_mpll_config ingenic_mpll_cfg[] = {
> + { 45250000, { { 0x01e0, 0x0000 }, { 0x21e1, 0x0000 }, { 0x41e2,
> 0x0000 } } },
> + { 92500000, { { 0x0140, 0x0005 }, { 0x2141, 0x0005 }, { 0x4142,
> 0x0005 } } },
> + { 148500000, { { 0x00a0, 0x000a }, { 0x20a1, 0x000a }, { 0x40a2,
> 0x000a } } },
> + { 216000000, { { 0x00a0, 0x000a }, { 0x2001, 0x000f }, { 0x4002,
> 0x000f } } },
> + { ~0UL, { { 0x0000, 0x0000 }, { 0x0000, 0x0000 }, { 0x0000,
> 0x0000 } } }
> +};
> +
> +static const struct dw_hdmi_curr_ctrl ingenic_cur_ctr[] = {
> + /*pixelclk bpp8 bpp10 bpp12 */
> + { 54000000, { 0x091c, 0x091c, 0x06dc } },
> + { 58400000, { 0x091c, 0x06dc, 0x06dc } },
> + { 72000000, { 0x06dc, 0x06dc, 0x091c } },
> + { 74250000, { 0x06dc, 0x0b5c, 0x091c } },
> + { 118800000, { 0x091c, 0x091c, 0x06dc } },
> + { 216000000, { 0x06dc, 0x0b5c, 0x091c } },
> + { ~0UL, { 0x0000, 0x0000, 0x0000 } },
> +};
> +
> +/*
> + * Resistance term 133Ohm Cfg
> + * PREEMP config 0.00
> + * TX/CK level 10
> + */
> +static const struct dw_hdmi_phy_config ingenic_phy_config[] = {
> + /*pixelclk symbol term vlev */
> + { 216000000, 0x800d, 0x0005, 0x01ad},
> + { ~0UL, 0x0000, 0x0000, 0x0000}
> +};
> +
> +static enum drm_mode_status
> +ingenic_dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->clock < 13500)
> + return MODE_CLOCK_LOW;
> + /* FIXME: Hardware is capable of 270MHz, but setup data is missing.
> */
> + if (mode->clock > 216000)
> + return MODE_CLOCK_HIGH;
> +
> + return MODE_OK;
> +}
> +
> +static struct dw_hdmi_plat_data ingenic_dw_hdmi_plat_data = {
> + .mpll_cfg = ingenic_mpll_cfg,
> + .cur_ctr = ingenic_cur_ctr,
> + .phy_config = ingenic_phy_config,
> + .mode_valid = ingenic_dw_hdmi_mode_valid,
> + .output_port = 1,
> +};
> +
> +static const struct of_device_id ingenic_dw_hdmi_dt_ids[] = {
> + { .compatible = "ingenic,jz4780-dw-hdmi" },
> + { /* Sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, ingenic_dw_hdmi_dt_ids);
> +
> +static void ingenic_dw_hdmi_cleanup(void *data)
> +{
> + struct dw_hdmi *hdmi = (struct dw_hdmi *)data;
> +
> + dw_hdmi_remove(hdmi);
> +}
> +
> +static int ingenic_dw_hdmi_probe(struct platform_device *pdev)
> +{
> + struct dw_hdmi *hdmi;
> +
> + hdmi = dw_hdmi_probe(pdev, &ingenic_dw_hdmi_plat_data);
> + if (IS_ERR(hdmi))
> + return PTR_ERR(hdmi);
> +
> + return devm_add_action_or_reset(&pdev->dev,
> ingenic_dw_hdmi_cleanup, hdmi);
I think I said it already, but in this driver you could use a .remove
callback, there's not much point in using devm cleanups in such a
simple setup.
In your probe you could just:
return PTR_ERR_OR_ZERO(hdmi);
> +}
> +
> +static struct platform_driver ingenic_dw_hdmi_driver = {
> + .probe = ingenic_dw_hdmi_probe,
> + .driver = {
> + .name = "dw-hdmi-ingenic",
> + .of_match_table = ingenic_dw_hdmi_dt_ids,
> + },
> +};
> +module_platform_driver(ingenic_dw_hdmi_driver);
> +
> +MODULE_DESCRIPTION("JZ4780 Specific DW-HDMI Driver Extension");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dwhdmi-ingenic");
Should probably be "platform:dw-hdmi-ingenic"?
Cheers,
-Paul
>
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