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References: <20210214232904.1142706-1-adrien.grassein@gmail.com>
 <20210214232904.1142706-3-adrien.grassein@gmail.com> <CAG3jFyvk6eRsyKxaJgu96s8A3w2-EZW-73JXuT-U4Y_3QspPSQ@mail.gmail.com>
 <CABkfQAE7MrV+Z=v530P_5ktcetYBB_iLDBN5aU=k6OdL8Tu0XA@mail.gmail.com>
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From:   Robert Foss <robert.foss@linaro.org>
Date:   Thu, 18 Feb 2021 22:26:17 +0100
Message-ID: <CAG3jFysyfcQHn49q3U+GZUNmw4rHqcBmag3g1n5-xOWwOmngGw@mail.gmail.com>
Subject: Re: [PATCH v2 2/2] drm/bridge: Introduce LT8912 DSI to HDMI bridge
To:     Adrien Grassein <adrien.grassein@gmail.com>
Cc:     David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Rob Herring <robh+dt@kernel.org>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Thu, 18 Feb 2021 at 21:36, Adrien Grassein <adrien.grassein@gmail.com> w=
rote:
>
> Hey Robert,
>
> Thank you for your time and for your review.
>
> Le mer. 17 f=C3=A9vr. 2021 =C3=A0 18:32, Robert Foss <robert.foss@linaro.=
org> a =C3=A9crit :
> >
> > Hey Adrien,
> >
> > Thanks for submitting this!
> >
> > On Mon, 15 Feb 2021 at 00:31, Adrien Grassein <adrien.grassein@gmail.co=
m> wrote:
> > >
> > > Lontium Lt8912 is a DSI to HDMI bridge.
> > >
> > > Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
> > > ---
> > >  MAINTAINERS                             |   1 +
> > >  drivers/gpu/drm/bridge/Kconfig          |  14 +
> > >  drivers/gpu/drm/bridge/Makefile         |   1 +
> > >  drivers/gpu/drm/bridge/lontium-lt8912.c | 719 ++++++++++++++++++++++=
++
> > >  4 files changed, 735 insertions(+)
> > >  create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912.c
> > >
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index f010b485aa7c..8b3d64b689c7 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -10444,6 +10444,7 @@ LONTIUM LT8912 MIPI TO HDMI BRIDGE
> > >  M:     Adrien Grassein <adrien.grassein@gmail.com>
> > >  S:     Maintained
> > >  F:     Documentation/devicetree/bindings/display/bridge/lontium,lt89=
12.yaml
> > > +F:     drivers/gpu/drm/bridge/lontium-lt8912.c
> > >
> > >  LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
> > >  M:     Sathya Prakash <sathya.prakash@broadcom.com>
> > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/=
Kconfig
> > > index e4110d6ca7b3..5b36d4b86e3c 100644
> > > --- a/drivers/gpu/drm/bridge/Kconfig
> > > +++ b/drivers/gpu/drm/bridge/Kconfig
> > > @@ -48,6 +48,20 @@ config DRM_DISPLAY_CONNECTOR
> > >           on ARM-based platforms. Saying Y here when this driver is n=
ot needed
> > >           will not cause any issue.
> > >
> > > +config DRM_LONTIUM_LT8912
> > > +       tristate "Lontium LT8912 DSI/HDMI bridge"
> > > +       depends on OF
> > > +       select DRM_PANEL_BRIDGE
> > > +       select DRM_KMS_HELPER
> > > +       select REGMAP_I2C
> > > +       help
> > > +         Driver for Lontium LT8912 DSI to HDMI bridge
> > > +         chip driver.
> > > +         Please say Y if you have such hardware.
> > > +
> > > +         Say M here if you want to support this hardware as a module=
.
> > > +         The module will be named "lontium-lt8912".
> > > +
> > >  config DRM_LONTIUM_LT9611
> > >         tristate "Lontium LT9611 DSI/HDMI bridge"
> > >         select SND_SOC_HDMI_CODEC if SND_SOC
> > > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge=
/Makefile
> > > index 86e7acc76f8d..5a1b201cea1f 100644
> > > --- a/drivers/gpu/drm/bridge/Makefile
> > > +++ b/drivers/gpu/drm/bridge/Makefile
> > > @@ -2,6 +2,7 @@
> > >  obj-$(CONFIG_DRM_CDNS_DSI) +=3D cdns-dsi.o
> > >  obj-$(CONFIG_DRM_CHRONTEL_CH7033) +=3D chrontel-ch7033.o
> > >  obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) +=3D display-connector.o
> > > +obj-$(CONFIG_DRM_LONTIUM_LT8912) +=3D lontium-lt8912.o
> > >  obj-$(CONFIG_DRM_LONTIUM_LT9611) +=3D lontium-lt9611.o
> > >  obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) +=3D lontium-lt9611uxc.o
> > >  obj-$(CONFIG_DRM_LVDS_CODEC) +=3D lvds-codec.o
> > > diff --git a/drivers/gpu/drm/bridge/lontium-lt8912.c b/drivers/gpu/dr=
m/bridge/lontium-lt8912.c
> > > new file mode 100644
> > > index 000000000000..d713d3365c3e
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/bridge/lontium-lt8912.c
> > > @@ -0,0 +1,719 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> > > + */
> > > +
> > > +#include <linux/device.h>
> > > +#include <linux/delay.h>
> > > +#include <linux/i2c.h>
> > > +#include <linux/gpio.h>
> > > +#include <linux/of_gpio.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include <drm/drm_probe_helper.h>
> > > +#include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_mipi_dsi.h>
> > > +#include <drm/drm_of.h>
> > > +
> > > +#include <video/videomode.h>
> > > +
> > > +#define I2C_MAIN 0
> > > +#define I2C_ADDR_MAIN 0x48
> > > +
> > > +#define I2C_CEC_DSI 1
> > > +#define I2C_ADDR_CEC_DSI 0x49
> > > +
> > > +#define I2C_MAX_IDX 2
> > > +
> > > +#define HPD_WORK_DELAY_MS 1000
> > > +
> > > +struct lt8912 {
> > > +       struct device *dev;
> > > +       struct drm_bridge bridge;
> > > +       struct drm_connector connector;
> > > +
> > > +       struct i2c_client *i2c_client[I2C_MAX_IDX];
> > > +       struct regmap *regmap[I2C_MAX_IDX];
> > > +
> > > +       struct device_node *host_node;
> > > +       struct drm_bridge *hdmi_port;
> > > +
> > > +       struct mipi_dsi_device *dsi;
> > > +
> > > +       struct gpio_desc *gp_reset;
> > > +
> > > +       struct videomode mode;
> > > +
> > > +       u8 data_lanes;
> > > +       bool is_power_on;
> > > +       bool is_attached;
> > > +};
> > > +
> > > +static int lt8912_write_init_config(struct lt8912 *lt)
> > > +{
> >
> > For the following register accesses it would be nice to see the
> > registers named and the value written to them documented. If you don't
> > have access to all of that information, not adding it is acceptable,
> > but it will make the driver harder to maintain & extend going forward.
> >
> > So if possible, document registers in the same way it was done for lt96=
11 [1].
> >
> > [1] https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/bridg=
e/lontium-lt9611.c#L444
> >
>
> Sorry, I don't have any documentation about this chip.
> I can't document these registers.

Ack, let's work with what we've got then :)

>
> > > +       const struct reg_sequence seq[] =3D {
> > > +               /* Digital clock en*/
> > > +               {0x08, 0xff},
> > > +               {0x09, 0xff},
> > > +               {0x0a, 0xff},
> > > +               {0x0b, 0x7c},
> > > +               {0x0c, 0xff},
> > > +               {0x42, 0x04},
> > > +
> > > +               /*Tx Analog*/
> > > +               {0x31, 0xb1},
> > > +               {0x32, 0xb1},
> > > +               {0x33, 0x0e},
> > > +               {0x37, 0x00},
> > > +               {0x38, 0x22},
> > > +               {0x60, 0x82},
> > > +
> > > +               /*Cbus Analog*/
> > > +               {0x39, 0x45},
> > > +               {0x3a, 0x00},
> > > +               {0x3b, 0x00},
> > > +
> > > +               /*HDMI Pll Analog*/
> > > +               {0x44, 0x31},
> > > +               {0x55, 0x44},
> > > +               {0x57, 0x01},
> > > +               {0x5a, 0x02},
> > > +
> > > +               /*MIPI Analog*/
> > > +               {0x3e, 0xd6},
> > > +               {0x3f, 0xd4},
> > > +               {0x41, 0x3c},
> > > +               {0xB2, 0x00},
> > > +       };
> > > +
> > > +       return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRA=
Y_SIZE(seq));
> > > +}
> > > +
> > > +static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
> > > +{
> > > +       const struct reg_sequence seq[] =3D {
> > > +               {0x12, 0x04},
> > > +               {0x14, 0x00},
> > > +               {0x15, 0x00},
> > > +               {0x1a, 0x03},
> > > +               {0x1b, 0x03},
> > > +       };
> > > +
> > > +       return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, A=
RRAY_SIZE(seq));
> > > +};
> > > +
> > > +static int lt8912_write_dds_config(struct lt8912 *lt)
> > > +{
> > > +       const struct reg_sequence seq[] =3D {
> > > +               {0x4e, 0xff},
> > > +               {0x4f, 0x56},
> > > +               {0x50, 0x69},
> > > +               {0x51, 0x80},
> > > +               {0x1f, 0x5e},
> > > +               {0x20, 0x01},
> > > +               {0x21, 0x2c},
> > > +               {0x22, 0x01},
> > > +               {0x23, 0xfa},
> > > +               {0x24, 0x00},
> > > +               {0x25, 0xc8},
> > > +               {0x26, 0x00},
> > > +               {0x27, 0x5e},
> > > +               {0x28, 0x01},
> > > +               {0x29, 0x2c},
> > > +               {0x2a, 0x01},
> > > +               {0x2b, 0xfa},
> > > +               {0x2c, 0x00},
> > > +               {0x2d, 0xc8},
> > > +               {0x2e, 0x00},
> > > +               {0x42, 0x64},
> > > +               {0x43, 0x00},
> > > +               {0x44, 0x04},
> > > +               {0x45, 0x00},
> > > +               {0x46, 0x59},
> > > +               {0x47, 0x00},
> > > +               {0x48, 0xf2},
> > > +               {0x49, 0x06},
> > > +               {0x4a, 0x00},
> > > +               {0x4b, 0x72},
> > > +               {0x4c, 0x45},
> > > +               {0x4d, 0x00},
> > > +               {0x52, 0x08},
> > > +               {0x53, 0x00},
> > > +               {0x54, 0xb2},
> > > +               {0x55, 0x00},
> > > +               {0x56, 0xe4},
> > > +               {0x57, 0x0d},
> > > +               {0x58, 0x00},
> > > +               {0x59, 0xe4},
> > > +               {0x5a, 0x8a},
> > > +               {0x5b, 0x00},
> > > +               {0x5c, 0x34},
> > > +               {0x1e, 0x4f},
> > > +               {0x51, 0x00},
> > > +       };
> > > +
> > > +       return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, A=
RRAY_SIZE(seq));
> > > +}
> > > +
> > > +static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
> > > +{
> > > +       int ret;
> > > +
> > > +       ret =3D regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
> > > +       usleep_range(10000, 20000);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);
> > > +
> > > +       return ret;
> > > +};
> > > +
> > > +static int lt8912_write_lvds_config(struct lt8912 *lt)
> > > +{
> > > +       const struct reg_sequence seq[] =3D {
> > > +               {0x44, 0x30},
> > > +               {0x51, 0x05},
> > > +               {0x50, 0x24},
> > > +               {0x51, 0x2d},
> > > +               {0x52, 0x04},
> > > +               {0x69, 0x0e},
> > > +               {0x69, 0x8e},
> > > +               {0x6a, 0x00},
> > > +               {0x6c, 0xb8},
> > > +               {0x6b, 0x51},
> > > +               {0x04, 0xfb},
> > > +               {0x04, 0xff},
> > > +               {0x7f, 0x00},
> > > +               {0xa8, 0x13},
> > > +               {0x02, 0xf7},
> > > +               {0x02, 0xff},
> > > +               {0x03, 0xcf},
> > > +               {0x03, 0xff},
> > > +       };
> > > +
> > > +       return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, A=
RRAY_SIZE(seq));
> > > +};
> > > +
> > > +static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
> > > +{
> > > +       return container_of(b, struct lt8912, bridge);
> > > +}
> > > +
> > > +static inline struct lt8912 *connector_to_lt8912(struct drm_connecto=
r *c)
> > > +{
> > > +       return container_of(c, struct lt8912, connector);
> > > +}
> > > +
> > > +static const struct regmap_config lt8912_regmap_config =3D {
> > > +       .reg_bits =3D 8,
> > > +       .val_bits =3D 8,
> > > +       .max_register =3D 0xff,
> > > +};
> > > +
> > > +static int lt8912_init_i2c(struct lt8912 *lt)
> > > +{
> > > +       unsigned int i;
> > > +       int ret;
> > > +       struct i2c_board_info info[] =3D {
> > > +               { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
> > > +               { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
> > > +       };
> > > +
> > > +       if (!lt)
> > > +               return -ENODEV;
> > > +
> > > +       for (i =3D 0; i < ARRAY_SIZE(info); i++) {
> > > +               if (i > 0) {
> > > +                       lt->i2c_client[i] =3D i2c_new_dummy_device(lt=
->i2c_client[0]->adapter,
> > > +                                                                    =
           info[i].addr);
> >
> > Bad indentation. Some of these bad indentations look ok for
> > tab-width=3D4, however tab-width=3D8 is what the style guide dictates.
> >
> > > +                       if (!lt->i2c_client[i])
> > > +                               return -ENODEV;
> > > +               }
> > > +               lt->regmap[i] =3D devm_regmap_init_i2c(lt->i2c_client=
[i],
> > > +                                                       &lt8912_regma=
p_config);
> >
> > Bad indentation.
> >
> > > +               if (IS_ERR(lt->regmap[i])) {
> > > +                       ret =3D PTR_ERR(lt->regmap[i]);
> > > +                       return ret;
> > > +               }
> > > +       }
> > > +       return 0;
> > > +}
> > > +
> > > +static int lt8912_free_i2c(struct lt8912 *lt)
> > > +{
> > > +       unsigned int i;
> > > +
> > > +       for (i =3D 1; i < I2C_MAX_IDX; i++)
> > > +               i2c_unregister_device(lt->i2c_client[i]);
> > > +
> > > +       return 0;
> > > +}
> > > +
> > > +static int lt8912_hard_power_on(struct lt8912 *lt)
> > > +{
> > > +       gpiod_set_value_cansleep(lt->gp_reset, 0);
> > > +       msleep(20);
> > > +
> > > +       return 0;
> > > +}
> > > +
> > > +static void lt8912_hard_power_off(struct lt8912 *lt)
> > > +{
> > > +       gpiod_set_value_cansleep(lt->gp_reset, 1);
> > > +       msleep(20);
> > > +       lt->is_power_on =3D false;
> > > +}
> > > +
> > > +static int lt8912_video_setup(struct lt8912 *lt)
> > > +{
> > > +       u32 hactive, h_total, hpw, hfp, hbp;
> > > +       u32 vactive, v_total, vpw, vfp, vbp;
> > > +       u8 settle =3D 0x08;
> > > +       int ret;
> > > +
> > > +       if (!lt)
> > > +               return -EINVAL;
> > > +
> > > +       hactive =3D lt->mode.hactive;
> > > +       hfp =3D lt->mode.hfront_porch;
> > > +       hpw =3D lt->mode.hsync_len;
> > > +       hbp =3D lt->mode.hback_porch;
> > > +       h_total =3D hactive + hfp + hpw + hbp;
> > > +
> > > +       vactive =3D lt->mode.vactive;
> > > +       vfp =3D lt->mode.vfront_porch;
> > > +       vpw =3D lt->mode.vsync_len;
> > > +       vbp =3D lt->mode.vback_porch;
> > > +       v_total =3D vactive + vfp + vpw + vbp;
> > > +
> > > +       if (vactive <=3D 600)
> > > +               settle =3D 0x04;
> > > +       else if (vactive =3D=3D 1080)
> > > +               settle =3D 0x0a;
> > > +
> > > +       ret =3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive =
& 0xff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive =
>> 8);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total =
& 0xff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total =
>> 8);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total =
& 0xff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total =
>> 8);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0x=
ff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8=
);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0x=
ff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8=
);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0x=
ff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8=
);
> > > +
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0x=
ff);
> > > +       ret |=3D regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8=
);
> > > +
> > > +       return ret;
> > > +}
> > > +
> > > +static int lt8912_soft_power_on(struct lt8912 *lt)
> > > +{
> > > +       if (!lt->is_power_on) {
> > > +               u32 lanes =3D lt->data_lanes;
> > > +
> > > +               lt8912_write_init_config(lt);
> > > +               regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3=
);
> > > +
> > > +               lt8912_write_mipi_basic_config(lt);
> > > +
> > > +               lt->is_power_on =3D true;
> > > +       }
> > > +
> > > +       return 0;
> > > +}
> > > +
> > > +static int lt8912_video_on(struct lt8912 *lt)
> > > +{
> > > +       int ret;
> > > +
> > > +       ret =3D lt8912_video_setup(lt);
> > > +       if (ret < 0)
> > > +               goto end;
> > > +
> > > +       ret =3D lt8912_write_dds_config(lt);
> > > +       if (ret < 0)
> > > +               goto end;
> > > +
> > > +       ret =3D lt8912_write_rxlogicres_config(lt);
> > > +       if (ret < 0)
> > > +               goto end;
> > > +
> > > +       ret =3D lt8912_write_lvds_config(lt);
> > > +       if (ret < 0)
> > > +               goto end;
> > > +
> > > +end:
> > > +       return ret;
> > > +}
> > > +
> > > +static enum drm_connector_status
> > > +lt8912_connector_detect(struct drm_connector *connector, bool force)
> > > +{
> > > +       struct lt8912 *lt =3D connector_to_lt8912(connector);
> > > +
> > > +       return drm_bridge_detect(lt->hdmi_port);
> > > +}
> > > +
> > > +static const struct drm_connector_funcs lt8912_connector_funcs =3D {
> > > +       .detect =3D lt8912_connector_detect,
> > > +       .fill_modes =3D drm_helper_probe_single_connector_modes,
> > > +       .destroy =3D drm_connector_cleanup,
> > > +       .reset =3D drm_atomic_helper_connector_reset,
> > > +       .atomic_duplicate_state =3D drm_atomic_helper_connector_dupli=
cate_state,
> > > +       .atomic_destroy_state =3D drm_atomic_helper_connector_destroy=
_state,
> > > +};
> > > +
> > > +static enum drm_mode_status
> > > +lt8912_connector_mode_valid(struct drm_connector *connector,
> > > +                           struct drm_display_mode *mode)
> > > +{
> > > +       if (mode->clock > 150000)
> > > +               return MODE_CLOCK_HIGH;
> > > +
> > > +       if (mode->hdisplay > 1920)
> > > +               return MODE_BAD_HVALUE;
> > > +
> > > +       if (mode->vdisplay > 1080)
> > > +               return MODE_BAD_VVALUE;
> > > +
> > > +       return MODE_OK;
> > > +}
> > > +
> > > +static int lt8912_connector_get_modes(struct drm_connector *connecto=
r)
> > > +{
> > > +       struct edid *edid;
> > > +       int ret, num =3D 0;
> > > +       struct lt8912 *lt =3D connector_to_lt8912(connector);
> > > +       u32 bus_format =3D MEDIA_BUS_FMT_RGB888_1X24;
> > > +
> > > +       edid =3D drm_bridge_get_edid(lt->hdmi_port, connector);
> >
> > Memory leak, edid is never free'd.
> >
> > > +       if (edid) {
> > > +               drm_connector_update_edid_property(connector, edid);
> > > +               num =3D drm_add_edid_modes(connector, edid);
> > > +       } else
> > > +               return ret;
> > > +
> > > +       ret =3D drm_display_info_set_bus_formats(&connector->display_=
info,
> > > +                               &bus_format, 1);
> >
> > Bad indentation.
> >
> > > +       if (ret)
> > > +               return ret;
> > > +
> > > +       return num;
> > > +}
> > > +
> > > +static const struct drm_connector_helper_funcs lt8912_connector_help=
er_funcs =3D {
> > > +       .get_modes =3D lt8912_connector_get_modes,
> > > +       .mode_valid =3D lt8912_connector_mode_valid,
> > > +};
> > > +
> > > +static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
> > > +                                  const struct drm_display_mode *mod=
e,
> > > +                                  const struct drm_display_mode *adj=
)
> > > +{
> > > +       struct lt8912 *lt =3D bridge_to_lt8912(bridge);
> > > +
> > > +       drm_display_mode_to_videomode(adj, &lt->mode);
> > > +}
> > > +
> > > +static void lt8912_bridge_enable(struct drm_bridge *bridge)
> > > +{
> > > +       struct lt8912 *lt =3D bridge_to_lt8912(bridge);
> > > +
> > > +       lt8912_video_on(lt);
> > > +}
> > > +
> > > +static int lt8912_attach_dsi(struct lt8912 *lt)
> > > +{
> > > +       struct device *dev =3D lt->dev;
> > > +       struct mipi_dsi_host *host;
> > > +       struct mipi_dsi_device *dsi;
> > > +       int ret =3D -1;
> > > +       const struct mipi_dsi_device_info info =3D { .type =3D "lt891=
2",
> > > +                                                  .channel =3D 0,
> > > +                                                  .node =3D NULL,
> > > +                                                };
> > > +
> > > +       host =3D of_find_mipi_dsi_host_by_node(lt->host_node);
> > > +       if (!host) {
> > > +               dev_err(dev, "failed to find dsi host\n");
> > > +               return -EPROBE_DEFER;
> > > +       }
> > > +
> > > +       dsi =3D mipi_dsi_device_register_full(host, &info);
> > > +       if (IS_ERR(dsi)) {
> > > +               ret =3D PTR_ERR(dsi);
> > > +               dev_err(dev, "failed to create dsi device (%d)\n", re=
t);
> > > +               goto err_dsi_device;
> > > +       }
> > > +
> > > +       lt->dsi =3D dsi;
> > > +
> > > +       dsi->lanes =3D lt->data_lanes;
> > > +       dsi->format =3D MIPI_DSI_FMT_RGB888;
> > > +
> > > +       dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO |
> > > +                       MIPI_DSI_MODE_VIDEO_BURST |
> > > +                       MIPI_DSI_MODE_LPM |
> > > +                       MIPI_DSI_MODE_EOT_PACKET;
> >
> > Maybe align the 3 last lines with where the 1st one starts.
> >
> > > +
> > > +       ret =3D mipi_dsi_attach(dsi);
> > > +       if (ret < 0) {
> > > +               dev_err(dev, "failed to attach dsi to host\n");
> > > +               goto err_dsi_attach;
> > > +       }
> > > +
> > > +       return 0;
> > > +
> > > +err_dsi_attach:
> > > +       mipi_dsi_device_unregister(dsi);
> > > +err_dsi_device:
> > > +       return ret;
> > > +}
> > > +
> > > +static void lt8912_detach_dsi(struct lt8912 *lt)
> > > +{
> > > +       mipi_dsi_detach(lt->dsi);
> > > +       mipi_dsi_device_unregister(lt->dsi);
> > > +}
> > > +
> > > +static int lt8912_bridge_init(struct drm_bridge *bridge)
> > > +{
> > > +       int ret;
> > > +       struct lt8912 *lt =3D bridge_to_lt8912(bridge);
> > > +       struct drm_connector *connector =3D &lt->connector;
> > > +
> > > +
> > > +       if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) {
> > > +               connector->polled =3D DRM_CONNECTOR_POLL_HPD;
> > > +       } else {
> > > +               connector->polled =3D DRM_CONNECTOR_POLL_CONNECT |
> > > +                                                       DRM_CONNECTOR=
_POLL_DISCONNECT;
> >
> > Bad indentation.
> >
> > > +       }
> > > +
> > > +
> > > +       ret =3D drm_connector_init(bridge->dev, connector,
> > > +                                &lt8912_connector_funcs,
> > > +                                lt->hdmi_port->type);
> > > +       if (ret)
> > > +               goto exit;
> > > +
> > > +       drm_connector_helper_add(connector, &lt8912_connector_helper_=
funcs);
> > > +
> > > +       connector->dpms =3D DRM_MODE_DPMS_OFF;
> > > +       drm_connector_attach_encoder(connector, bridge->encoder);
> > > +
> > > +
> > > +       ret =3D lt8912_hard_power_on(lt);
> > > +       if (ret)
> > > +               goto exit;
> > > +
> > > +       ret =3D lt8912_soft_power_on(lt);
> > > +
> > > +exit:
> > > +       return ret;
> > > +}
> > > +
> > > +static int lt8912_bridge_attach(struct drm_bridge *bridge,
> > > +                                                               enum =
drm_bridge_attach_flags flags)
> >
> > Bad indentation.
> >
> > > +{
> > > +       struct lt8912 *lt =3D bridge_to_lt8912(bridge);
> > > +       int ret;
> > > +
> > > +       /* No need to check the return of this function */
> > > +       drm_bridge_attach(lt->bridge.encoder,
> > > +                                         lt->hdmi_port,
> > > +                                         &lt->bridge,
> > > +                                         flags);
> >
> > Bad indentation.
> >
> > > +
> > > +       if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> > > +               ret =3D lt8912_bridge_init(bridge);
> > > +               if (ret) {
> > > +                       dev_err(lt->dev, "Failed to init bridge ! (%d=
)\n", ret);
> > > +                       return ret;
> > > +               }
> > > +       }
> > > +
> > > +       ret =3D lt8912_attach_dsi(lt);
> > > +       if (ret)
> > > +               return ret;
> > > +
> > > +       lt->is_attached =3D true;
> > > +
> > > +       return ret;
> > > +}
> > > +
> > > +static void lt8912_bridge_detach(struct drm_bridge *bridge)
> > > +{
> > > +       struct lt8912 *lt =3D bridge_to_lt8912(bridge);
> > > +
> > > +       if (lt->is_attached) {
> > > +               lt8912_detach_dsi(lt);
> > > +               lt8912_hard_power_off(lt);
> > > +       }
> > > +}
> > > +
> > > +static const struct drm_bridge_funcs lt8912_bridge_funcs =3D {
> > > +       .attach =3D lt8912_bridge_attach,
> > > +       .detach =3D lt8912_bridge_detach,
> > > +       .mode_set =3D lt8912_bridge_mode_set,
> > > +       .enable =3D lt8912_bridge_enable,
> >
> > Have a look at the documentation around in drm_bridge_funcs[1], some
> > additional functions have to be implemented. I think you can look at
> > lt9611[2] & lt9611uxc[3] for inspiration.
> >
> > [1] https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#bridg=
e-operations
> > [2] https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/brid=
ge/lontium-lt9611.c#L947
> > [3] https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/brid=
ge/lontium-lt9611uxc.c#L542
> >
> >
> > > +};
> > > +
> > > +static int lt8912_parse_dt(struct lt8912 *lt)
> > > +{
> > > +       struct gpio_desc *gp_reset;
> > > +       struct device *dev =3D lt->dev;
> > > +       int ret =3D 0;
> > > +       struct device_node *port_node;
> > > +       struct device_node *endpoint;
> > > +
> > > +       gp_reset =3D devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_=
HIGH);
> > > +       if (IS_ERR(gp_reset)) {
> > > +               ret =3D PTR_ERR(gp_reset);
> > > +               if (ret !=3D -EPROBE_DEFER)
> > > +                       dev_err(dev, "Failed to get reset gpio: %d\n"=
, ret);
> > > +               return ret;
> > > +       }
> > > +       lt->gp_reset =3D gp_reset;
> > > +
> > > +
> > > +       endpoint =3D of_graph_get_endpoint_by_regs(dev->of_node, 0, -=
1);
> > > +       if (IS_ERR(endpoint)) {
> > > +               ret =3D PTR_ERR(endpoint);
> > > +               goto end;
> > > +       }
> > > +
> > > +       lt->data_lanes =3D of_property_count_u32_elems(endpoint, "dat=
a-lanes");
> > > +       of_node_put(endpoint);
> > > +
> > > +       lt->host_node =3D of_graph_get_remote_node(dev->of_node, 0, -=
1);
> > > +       if (!lt->host_node) {
> > > +               dev_err(lt->dev, "%s: Failed to get remote port\n", _=
_func__);
> > > +               ret =3D -ENODEV;
> > > +               goto end;
> > > +       }
> > > +
> > > +       port_node =3D of_graph_get_remote_node(dev->of_node, 1, -1);
> > > +       if (!port_node) {
> > > +               dev_err(lt->dev, "%s: Failed to get connector port\n"=
, __func__);
> > > +               ret =3D -ENODEV;
> > > +               goto err_free_host_node;
> > > +       }
> > > +
> > > +       lt->hdmi_port =3D of_drm_find_bridge(port_node);
> > > +       if (IS_ERR(lt->hdmi_port)) {
> > > +               dev_err(lt->dev, "%s: Failed to get hdmi port\n", __f=
unc__);
> > > +               ret =3D PTR_ERR(lt->hdmi_port);
> > > +               of_node_put(lt->host_node);
> > > +               goto end;
> > > +       }
> > > +
> > > +       if (!of_device_is_compatible(port_node, "hdmi-connector")) {
> > > +               dev_err(lt->dev, "%s: Failed to get hdmi port\n", __f=
unc__);
> > > +               ret =3D -EINVAL;
> > > +       }
> > > +
> > > +       of_node_put(port_node);
> > > +
> > > +end:
> > > +       return ret;
> > > +
> > > +err_free_host_node:
> > > +       of_node_put(lt->host_node);
> > > +       return ret;
> > > +}
> > > +
> > > +static int lt8912_put_dt(struct lt8912 *lt)
> > > +{
> > > +       of_node_put(lt->host_node);
> > > +       return 0;
> > > +}
> > > +
> > > +static int lt8912_probe(struct i2c_client *client,
> > > +        const struct i2c_device_id *id)
> > > +{
> > > +       static struct lt8912 *lt;
> > > +       int ret =3D 0;
> > > +       struct device *dev =3D &client->dev;
> > > +
> > > +       lt =3D devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
> > > +       if (!lt)
> > > +               return -ENOMEM;
> > > +
> > > +       lt->dev =3D dev;
> > > +       lt->i2c_client[0] =3D client;
> >
> > The i2c_client that is created from the DT address and passed into
> > lt8912_probe will be overwritten by the i2c clients created in
> > lt8912_init_i2c before it is ever used.
>
> I think you made a mistake here.
> The lt8912_init_i2c function only initializes the  lt->i2c_client[1].
> (You can check the if condition).

You are 100% correct.

>
> >
> > A related issue is that this device has two I2C addresses, which
> > doesn't fit super neatly into the I2C driver model[1]. Since both
> > addresses can't be provided by the DT, method one doesn't fit this
> > driver. Method 2 doesn't fit well either, since the I2C bus isn't
> > internal to the device. And 3&4 are not applicable. I'd say the two
> > options are #1 splitting this driver, #2 keeping it like it is. I'm
> > leaning towards #2 since both addresses correspond to a physical chip.
> >
> > [1] https://www.kernel.org/doc/html/latest/i2c/instantiating-devices.ht=
ml
> >
> > > +
> > > +       ret =3D lt8912_parse_dt(lt);
> > > +       if (ret)
> > > +               goto err_dt_parse;
> > > +
> > > +       ret =3D lt8912_init_i2c(lt);
> > > +       if (ret)
> > > +               goto err_i2c;
> > > +
> > > +       i2c_set_clientdata(client, lt);
> > > +
> > > +       lt->bridge.funcs =3D &lt8912_bridge_funcs;
> > > +       lt->bridge.of_node =3D dev->of_node;
> > > +       drm_bridge_add(&lt->bridge);
> > > +
> > > +       return 0;
> > > +
> > > +err_i2c:
> > > +       lt8912_put_dt(lt);
> > > +err_dt_parse:
> > > +       return ret;
> > > +}
> > > +
> > > +static int lt8912_remove(struct i2c_client *client)
> > > +{
> > > +       struct lt8912 *lt =3D i2c_get_clientdata(client);
> > > +
> > > +       lt8912_bridge_detach(&lt->bridge);
> > > +       drm_bridge_remove(&lt->bridge);
> > > +       lt8912_free_i2c(lt);
> > > +       lt8912_put_dt(lt);
> > > +
> > > +       return 0;
> > > +}
> > > +
> > > +static const struct of_device_id lt8912_dt_match[] =3D {
> > > +       {.compatible =3D "lontium,lt8912"},
> > > +       {}
> > > +};
> > > +MODULE_DEVICE_TABLE(of, lt8912_dt_match);
> > > +
> > > +static const struct i2c_device_id lt8912_id[] =3D {
> > > +       {"lt8912", 0},
> > > +       {},
> > > +};
> > > +MODULE_DEVICE_TABLE(i2c, lt8912_id);
> > > +
> > > +static struct i2c_driver lt8912_i2c_driver =3D {
> > > +       .driver =3D {
> > > +               .name =3D "lt8912",
> > > +               .of_match_table =3D lt8912_dt_match,
> > > +               .owner =3D THIS_MODULE,
> >
> > The .owner assignment is redundant as it is later re-assigned in[1].
> >
> > module_i2c_driver -> i2c_add_driver -> i2c_register_driver
> >
> > [1] https://elixir.bootlin.com/linux/latest/source/drivers/i2c/i2c-core=
-base.c#L1796
> >
> > > +       },
> > > +       .probe =3D lt8912_probe,
> > > +       .remove =3D lt8912_remove,
> > > +       .id_table =3D lt8912_id,
> > > +};
> > > +module_i2c_driver(lt8912_i2c_driver);
> > > +
> > > +MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
> > > +MODULE_DESCRIPTION("lt8912 drm driver");
> > > +MODULE_LICENSE("GPL v2");
> > > --
> > > 2.25.1
> > >
>
> I will send a new version with the fixes.
>
> Thanks again,
> Adrien Grassein

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From: Robert Foss <robert.foss@linaro.org>
Date: Thu, 18 Feb 2021 22:26:17 +0100
Message-ID: <CAG3jFysyfcQHn49q3U+GZUNmw4rHqcBmag3g1n5-xOWwOmngGw@mail.gmail.com>
Subject: Re: [PATCH v2 2/2] drm/bridge: Introduce LT8912 DSI to HDMI bridge
To: Adrien Grassein <adrien.grassein@gmail.com>
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