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Message-Id: <016973B0-B7F0-4E63-BF4F-2643611A6351@goldelico.com>
Date: Wed, 24 Nov 2021 17:13:30 +0100
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: Paul Cercueil <paul@...pouillou.net>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Kees Cook <keescook@...omium.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Ezequiel Garcia <ezequiel@...labora.com>,
Harry Wentland <harry.wentland@....com>,
Sam Ravnborg <sam@...nborg.org>,
Maxime Ripard <maxime@...no.tech>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Paul Boddie <paul@...die.org.uk>, devicetree@...r.kernel.org,
linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
letux-kernel@...nphoenux.org, Jonas Karlman <jonas@...boo.se>,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v8 4/8] drm/ingenic: Add dw-hdmi driver for jz4780
> Am 23.11.2021 um 21:05 schrieb Paul Cercueil <paul@...pouillou.net>:
>
> Hi Nikolaus,
>
> I keep seeing a few things, sorry.
no problem.
>
>
> Le mar., nov. 23 2021 at 19:13:57 +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 | 129 ++++++++++++++++++++++
>> 3 files changed, 139 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 3b57f8be007c4..4efc709d77b0a 100644
>> --- a/drivers/gpu/drm/ingenic/Kconfig
>> +++ b/drivers/gpu/drm/ingenic/Kconfig
>> @@ -25,4 +25,13 @@ 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..c14890d6b9826
>> --- /dev/null
>> +++ b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
>> @@ -0,0 +1,129 @@
>> +// 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/platform_device.h>
>> +#include <linux/regmap.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 int ingenic_dw_hdmi_probe(struct platform_device *pdev)
>> +{
>> + struct dw_hdmi *hdmi;
>> + struct regulator *regulator;
>> + int ret;
>> +
>> + hdmi = dw_hdmi_probe(pdev, &ingenic_dw_hdmi_plat_data);
>> + if (IS_ERR(hdmi))
>> + return PTR_ERR(hdmi);
>> +
>> + platform_set_drvdata(pdev, hdmi);
>> +
>> + regulator = devm_regulator_get_optional(&pdev->dev, "hdmi-5v");
>> +
>
> Nit - you can remove this blank line.
ok.
>
>> + if (IS_ERR(regulator)) {
>> + ret = PTR_ERR(regulator);
>> +
>> + DRM_DEV_ERROR(&pdev->dev, "failed to get hpd regulator: %s (%d)\n",
>> + "hdmi-5v", ret);
>> + return ret;
>> + }
>> +
>> + ret = regulator_enable(regulator);
>
> You used devm_regulator_get_optional(), so you are not guaranteed to obtain anything; your "regulator" variable might be a NULL pointer, so you can't just call regulator_enable() without checking it first.
right. I forgot about that.
>
>> + if (ret) {
>> + DRM_DEV_ERROR(&pdev->dev, "Failed to enable hpd regulator: %d\n",
>> + ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ingenic_dw_hdmi_remove(struct platform_device *pdev)
>> +{
>> + struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
>> +
>> + dw_hdmi_remove(hdmi);
>
> You probably should disable the regulator (if not NULL) here.
Indeed. Would it be ok to make struct regulator *regulator static
or do we need dynamically allocated memory?
>
>> +
>> + return 0;
>> +}
>> +
>> +static struct platform_driver ingenic_dw_hdmi_driver = {
>> + .probe = ingenic_dw_hdmi_probe,
>> + .remove = ingenic_dw_hdmi_remove,
>> + .driver = {
>> + .name = "dw-hdmi-ingenic",
>> + .of_match_table = ingenic_dw_hdmi_dt_ids,
>> + },
>> +};
>> +
>
> Nit - remove this blank line too.
ok.
>
> Cheers,
> -Paul
>
>> +module_platform_driver(ingenic_dw_hdmi_driver);
>> +
>> +MODULE_DESCRIPTION("JZ4780 Specific DW-HDMI Driver Extension");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_ALIAS("platform:dwhdmi-ingenic");
>> --
>> 2.33.0
>
>
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