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Message-ID: <bd0b0193-90f1-d3e7-32f0-ed400d575b5c@linaro.org>
Date:   Mon, 22 May 2023 18:30:08 +0200
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Subject: Re: [PATCH RFC 06/10] drm/panel/samsung-sofef01: Add panel driver for
 Sony Xperia 5 / 10 II
Content-Language: en-US
To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Marijn Suijten <marijn.suijten@somainline.org>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Caleb Connolly <caleb@connolly.tech>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>
Cc:     ~postmarketos/upstreaming@lists.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@somainline.org>,
        Martin Botka <martin.botka@somainline.org>,
        Jami Kettunen <jami.kettunen@somainline.org>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Kuogee Hsieh <quic_khsieh@quicinc.com>,
        Jessica Zhang <quic_jesszhan@quicinc.com>
References: <20230521-drm-panels-sony-v1-0-541c341d6bee@somainline.org>
 <20230521-drm-panels-sony-v1-6-541c341d6bee@somainline.org>
 <f34cd6a8-6d6d-9dcf-b681-56439416c4b4@linaro.org>
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
In-Reply-To: <f34cd6a8-6d6d-9dcf-b681-56439416c4b4@linaro.org>
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Precedence: bulk


On 22.05.2023 03:19, Dmitry Baryshkov wrote:
> On 22/05/2023 00:23, Marijn Suijten wrote:
>> This SOFEF01-M Display-IC driver supports two modes with different
>> compatibles to differentiate between slightly different physical sizes
>> (panels) found on the Xperia 5 (6.1") and 10 II (6.0").
>>
>> It is currently also used to hardcode significantly higher fake porches
>> for the Xperia 5, which are unused in transfers due to this being a
>> command-mode panel but do have an effect on the clock rates set by
>> dsi_host.c.  Without higher clock rates this panel fails to achieve
>> 60fps and has significant tearing artifacts, while the same calculated
>> clock rate works perfectly fine on the Xperia 10 II.
>>
>> Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
>> ---
>>   drivers/gpu/drm/panel/Kconfig                 |  12 +
>>   drivers/gpu/drm/panel/Makefile                |   1 +
>>   drivers/gpu/drm/panel/panel-samsung-sofef01.c | 360 ++++++++++++++++++++++++++
>>   3 files changed, 373 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
>> index 18bd116e78a71..3f11e9906f2cb 100644
>> --- a/drivers/gpu/drm/panel/Kconfig
>> +++ b/drivers/gpu/drm/panel/Kconfig
>> @@ -618,6 +618,18 @@ config DRM_PANEL_SAMSUNG_SOFEF00
>>           The panels are 2280x1080@60Hz and 2340x1080@60Hz respectively
>>   +config DRM_PANEL_SAMSUNG_SOFEF01
>> +    tristate "Samsung sofef01 Sony Xperia 5 / 10 II DSI cmd mode panels"
>> +    depends on GPIOLIB
>> +    depends on OF
>> +    depends on DRM_MIPI_DSI
>> +    depends on BACKLIGHT_CLASS_DEVICE
>> +    help
>> +      Say Y or M here if you want to enable support for the Samsung AMOLED
>> +      command mode panels found in the Sony Xperia 5 / 10 II smartphones.
>> +
>> +      This panel features a fixed mode of 1080x2520@60.
>> +
>>   config DRM_PANEL_SEIKO_43WVF1G
>>       tristate "Seiko 43WVF1G panel"
>>       depends on OF
>> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
>> index 85133f73558f3..a4039d0fc9cfb 100644
>> --- a/drivers/gpu/drm/panel/Makefile
>> +++ b/drivers/gpu/drm/panel/Makefile
>> @@ -62,6 +62,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0_DSI) += panel-samsung-s6e63m0-dsi.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01) += panel-samsung-s6e88a0-ams452ef01.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_SOFEF00) += panel-samsung-sofef00.o
>> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_SOFEF01) += panel-samsung-sofef01.o
>>   obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
>>   obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
>>   obj-$(CONFIG_DRM_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
>> diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef01.c b/drivers/gpu/drm/panel/panel-samsung-sofef01.c
>> new file mode 100644
>> index 0000000000000..18dc67a301a7b
>> --- /dev/null
>> +++ b/drivers/gpu/drm/panel/panel-samsung-sofef01.c
>> @@ -0,0 +1,360 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +// Copyright (c) 2023 Marijn Suijten <marijn.suijten@somainline.org>
>> +
>> +#include <linux/backlight.h>
>> +#include <linux/delay.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/regulator/consumer.h>
>> +
>> +#include <video/mipi_display.h>
>> +
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_modes.h>
>> +#include <drm/drm_panel.h>
>> +#include <drm/drm_probe_helper.h>
>> +
>> +struct samsung_sofef01_m {
>> +    struct drm_panel panel;
>> +    struct mipi_dsi_device *dsi;
>> +    struct regulator *vddio, *vci;
>> +    struct gpio_desc *reset_gpio;
>> +    const struct drm_display_mode *mode;
>> +    bool prepared;
>> +};
>> +
>> +static inline struct samsung_sofef01_m *to_samsung_sofef01_m(struct drm_panel *panel)
>> +{
>> +    return container_of(panel, struct samsung_sofef01_m, panel);
>> +}
>> +
>> +static void samsung_sofef01_m_reset(struct samsung_sofef01_m *ctx)
>> +{
>> +    gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> +    usleep_range(10000, 11000);
>> +}
>> +
>> +static int samsung_sofef01_m_on(struct samsung_sofef01_m *ctx)
>> +{
>> +    struct mipi_dsi_device *dsi = ctx->dsi;
>> +    struct device *dev = &dsi->dev;
>> +    int ret;
>> +
>> +    dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>> +
>> +    ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
>> +        return ret;
>> +    }
>> +    usleep_range(10000, 11000);
>> +
>> +    ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to set tear on: %d\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xdf, 0x03);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xe0, 0x01);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
>> +
>> +    ret = mipi_dsi_dcs_set_page_address(dsi, 0x0000, 2520 - 1);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to set page address: %d\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
>> +    mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xbe, 0x92, 0x29);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x06);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x90);
>> +    mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
>> +    msleep(110);
>> +
>> +    ret = mipi_dsi_dcs_set_display_on(dsi);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to turn display on: %d\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int samsung_sofef01_m_off(struct samsung_sofef01_m *ctx)
>> +{
>> +    struct mipi_dsi_device *dsi = ctx->dsi;
>> +    struct device *dev = &dsi->dev;
>> +    int ret;
>> +
>> +    dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +
>> +    ret = mipi_dsi_dcs_set_display_off(dsi);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to turn display off: %d\n", ret);
>> +        return ret;
>> +    }
>> +    msleep(20);
>> +
>> +    ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
>> +        return ret;
>> +    }
>> +    msleep(120);
>> +
>> +    return 0;
>> +}
>> +
>> +static int samsung_sofef01_m_prepare(struct drm_panel *panel)
>> +{
>> +    struct samsung_sofef01_m *ctx = to_samsung_sofef01_m(panel);
>> +    struct device *dev = &ctx->dsi->dev;
>> +    int ret;
>> +
>> +    if (ctx->prepared)
>> +        return 0;
>> +
>> +    ret = regulator_enable(ctx->vddio);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to enable vddio regulator: %d\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    ret = regulator_enable(ctx->vci);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to enable vci regulator: %d\n", ret);
>> +        regulator_disable(ctx->vddio);
>> +        return ret;
>> +    }
>> +
>> +    samsung_sofef01_m_reset(ctx);
>> +
>> +    ret = samsung_sofef01_m_on(ctx);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to initialize panel: %d\n", ret);
>> +        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +        regulator_disable(ctx->vci);
>> +        regulator_disable(ctx->vddio);
>> +        return ret;
>> +    }
>> +
>> +    ctx->prepared = true;
>> +    return 0;
>> +}
>> +
>> +static int samsung_sofef01_m_unprepare(struct drm_panel *panel)
>> +{
>> +    struct samsung_sofef01_m *ctx = to_samsung_sofef01_m(panel);
>> +    struct device *dev = &ctx->dsi->dev;
>> +    int ret;
>> +
>> +    if (!ctx->prepared)
>> +        return 0;
>> +
>> +    ret = samsung_sofef01_m_off(ctx);
>> +    if (ret < 0)
>> +        dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
>> +
>> +    gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +    regulator_disable(ctx->vci);
>> +    regulator_disable(ctx->vddio);
>> +
>> +    ctx->prepared = false;
>> +    return 0;
>> +}
>> +
>> +static int samsung_sofef01_m_get_modes(struct drm_panel *panel,
>> +                       struct drm_connector *connector)
>> +{
>> +    struct samsung_sofef01_m *ctx = to_samsung_sofef01_m(panel);
>> +
>> +    return drm_connector_helper_get_modes_fixed(connector, ctx->mode);
>> +}
>> +
>> +static const struct drm_panel_funcs samsung_sofef01_m_panel_funcs = {
>> +    .prepare = samsung_sofef01_m_prepare,
>> +    .unprepare = samsung_sofef01_m_unprepare,
>> +    .get_modes = samsung_sofef01_m_get_modes,
>> +};
>> +
>> +static int samsung_sofef01_m_bl_update_status(struct backlight_device *bl)
>> +{
>> +    struct mipi_dsi_device *dsi = bl_get_data(bl);
>> +    u16 brightness = backlight_get_brightness(bl);
>> +    int ret;
>> +
>> +    dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +
>> +    ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>> +
>> +    return 0;
>> +}
>> +
>> +static int samsung_sofef01_m_bl_get_brightness(struct backlight_device *bl)
>> +{
>> +    struct mipi_dsi_device *dsi = bl_get_data(bl);
>> +    u16 brightness;
>> +    int ret;
>> +
>> +    dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +
>> +    ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
>> +
>> +    dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>> +
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    return brightness;
>> +}
>> +
>> +static const struct backlight_ops samsung_sofef01_m_bl_ops = {
>> +    .update_status = samsung_sofef01_m_bl_update_status,
>> +    .get_brightness = samsung_sofef01_m_bl_get_brightness,
>> +};
>> +
>> +static struct backlight_device *
>> +samsung_sofef01_m_create_backlight(struct mipi_dsi_device *dsi)
>> +{
>> +    struct device *dev = &dsi->dev;
>> +    const struct backlight_properties props = {
>> +        .type = BACKLIGHT_RAW,
>> +        .brightness = 100,
>> +        .max_brightness = 1023,
>> +    };
>> +
>> +    return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
>> +                          &samsung_sofef01_m_bl_ops, &props);
>> +}
>> +
>> +static int samsung_sofef01_m_probe(struct mipi_dsi_device *dsi)
>> +{
>> +    struct device *dev = &dsi->dev;
>> +    struct samsung_sofef01_m *ctx;
>> +    int ret;
>> +
>> +    ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> +    if (!ctx)
>> +        return -ENOMEM;
>> +
>> +    ctx->vddio = devm_regulator_get(dev, "vddio");
>> +    if (IS_ERR(ctx->vddio))
>> +        return dev_err_probe(dev, PTR_ERR(ctx->vddio),
>> +                     "Failed to get vddio regulator\n");
>> +
>> +    ctx->vci = devm_regulator_get(dev, "vci");
>> +    if (IS_ERR(ctx->vci))
>> +        return dev_err_probe(dev, PTR_ERR(ctx->vci),
>> +                     "Failed to get vci regulator\n");
>> +
>> +    ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
>> +    if (IS_ERR(ctx->reset_gpio))
>> +        return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
>> +                     "Failed to get reset-gpios\n");
>> +
>> +    ctx->dsi = dsi;
>> +    ctx->mode = of_device_get_match_data(dev);
>> +    mipi_dsi_set_drvdata(dsi, ctx);
>> +
>> +    dsi->lanes = 4;
>> +    dsi->format = MIPI_DSI_FMT_RGB888;
>> +    dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS;
>> +
>> +    drm_panel_init(&ctx->panel, dev, &samsung_sofef01_m_panel_funcs,
>> +               DRM_MODE_CONNECTOR_DSI);
>> +
>> +    ctx->panel.backlight = samsung_sofef01_m_create_backlight(dsi);
>> +    if (IS_ERR(ctx->panel.backlight))
>> +        return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
>> +                     "Failed to create backlight\n");
>> +
>> +    drm_panel_add(&ctx->panel);
>> +
>> +    ret = mipi_dsi_attach(dsi);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
>> +        drm_panel_remove(&ctx->panel);
>> +        return ret;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static void samsung_sofef01_m_remove(struct mipi_dsi_device *dsi)
>> +{
>> +    struct samsung_sofef01_m *ctx = mipi_dsi_get_drvdata(dsi);
>> +    int ret;
>> +
>> +    ret = mipi_dsi_detach(dsi);
>> +    if (ret < 0)
>> +        dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
>> +
>> +    drm_panel_remove(&ctx->panel);
>> +}
>> +
>> +/* Sony Xperia 5 (kumano bahamut) */
>> +static const struct drm_display_mode samsung_sofef01_m_bahamut_mode = {
>> +    /*
>> +     * WARNING: These massive porches are wrong/useless for CMDmode
>> +     * (and not defined in downstream DTS) but necessary to bump dsi
>> +     * clocks higher, so that we can achieve proper 60fps without tearing.
>> +     */
>> +    .clock = (1080 + 156 + 8 + 8) * (2520 + 2393 + 8 + 8) * 60 / 1000,
>> +    .hdisplay = 1080,
>> +    .hsync_start = 1080 + 156,
>> +    .hsync_end = 1080 + 156 + 8,
>> +    .htotal = 1080 + 156 + 8 + 8,
>> +    .vdisplay = 2520,
>> +    .vsync_start = 2520 + 2393,
>> +    .vsync_end = 2520 + 2393 + 8,
>> +    .vtotal = 2520 + 2393 + 8 + 8,
>> +    .width_mm = 61,
>> +    .height_mm = 142,
>> +};
>> +
>> +/* Sony Xperia 10 II (seine pdx201) */
>> +static const struct drm_display_mode samsung_sofef01_m_pdx201_mode = {
>> +    .clock = (1080 + 8 + 8 + 8) * (2520 + 8 + 8 + 8) * 60 / 1000,
>> +    .hdisplay = 1080,
>> +    .hsync_start = 1080 + 8,
>> +    .hsync_end = 1080 + 8 + 8,
>> +    .htotal = 1080 + 8 + 8 + 8,
>> +    .vdisplay = 2520,
>> +    .vsync_start = 2520 + 8,
>> +    .vsync_end = 2520 + 8 + 8,
>> +    .vtotal = 2520 + 8 + 8 + 8,
>> +    .width_mm = 60,
>> +    .height_mm = 139,
>> +};
>> +
>> +static const struct of_device_id samsung_sofef01_m_of_match[] = {
>> +    { .compatible = "samsung,sofef01-m-bahamut", .data = &samsung_sofef01_m_bahamut_mode },
>> +    { .compatible = "samsung,sofef01-m-pdx201", .data = &samsung_sofef01_m_pdx201_mode },
> 
> Are there really two panels? Can we use one mode for both usecases?
The porches differ by a significant margin but that may or may not
matter for cmd mode.. If we come to unify them, one can add width-mm
(or something like that) in the device tree if that turns out to be
the only difference.

Konrad
> 
>> +    { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, samsung_sofef01_m_of_match);
>> +
>> +static struct mipi_dsi_driver samsung_sofef01_m_driver = {
>> +    .probe = samsung_sofef01_m_probe,
>> +    .remove = samsung_sofef01_m_remove,
>> +    .driver = {
>> +        .name = "panel-samsung-sofef01-m",
>> +        .of_match_table = samsung_sofef01_m_of_match,
>> +    },
>> +};
>> +module_mipi_dsi_driver(samsung_sofef01_m_driver);
>> +
>> +MODULE_AUTHOR("Marijn Suijten <marijn.suijten@somainline.org>");
>> +MODULE_DESCRIPTION("DRM panel driver for Samsung SOFEF01-M Display-IC panels");
>> +MODULE_LICENSE("GPL");
>>
>