linux-kernel - Re: [PATCH 3/8] drm/loongson: Allow attach drm bridge driver by calling lsdc_output

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Message-ID: <0b704a08-46d2-4c31-b51f-8abf09f99f88@loongson.cn>
Date:   Mon, 30 Oct 2023 17:13:57 +0800
From:   Sui Jingfeng <suijingfeng@...ngson.cn>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 3/8] drm/loongson: Allow attach drm bridge driver by
 calling lsdc_output_init()

Hi,


On 2023/10/30 07:10, Dmitry Baryshkov wrote:
>> +
>> +static void lsdc_pipe1_hdmi_encoder_reset(struct drm_encoder *encoder)
>> +{
>> +       struct drm_device *ddev = encoder->dev;
>> +       struct lsdc_device *ldev = to_lsdc(ddev);
>> +       u32 val;
>> +
>> +       val = PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN;
>> +       lsdc_wreg32(ldev, LSDC_CRTC1_DVO_CONF_REG, val);
>> +
>> +       /* Using built-in GPIO emulated I2C instead of the hardware I2C */
>> +       lsdc_ureg32_clr(ldev, LSDC_HDMI1_INTF_CTRL_REG, HW_I2C_EN);
>> +
>> +       /* Help the HDMI phy get out of reset state */
>> +       lsdc_wreg32(ldev, LSDC_HDMI1_PHY_CTRL_REG, HDMI_PHY_RESET_N);
>> +
>> +       drm_dbg(ddev, "%s reset\n", encoder->name);
>> +
>> +       mdelay(20);
>> +}
>> +
>> +const struct drm_encoder_funcs lsdc_pipe1_hdmi_encoder_funcs = {
>> +       .reset = lsdc_pipe1_hdmi_encoder_reset,
>> +       .destroy = drm_encoder_cleanup,
>> +};
>> +
>> +/* Built-in DVO encoder helper funcs */
>> +
>> +static void lsdc_dvo_atomic_disable(struct drm_encoder *encoder,
>> +                                   struct drm_atomic_state *state)
>> +{
>> +}
>> +
>> +static void lsdc_dvo_atomic_enable(struct drm_encoder *encoder,
>> +                                  struct drm_atomic_state *state)
>> +{
>> +}
>> +
>> +static void lsdc_dvo_atomic_modeset(struct drm_encoder *encoder,
>> +                                   struct drm_crtc_state *crtc_state,
>> +                                   struct drm_connector_state *conn_state)
>> +{
>> +}
> You do not need these empty callbacks, do you?


Thanks a lot for the sharpen eyes.

Yes. I do not need these empty callbacks.
I have some program experience with Linux-4.19 kernel.
I clearly remember that these empty callbacks was need when I add lt8619 display bridge driver.
I have just remove it and tested, it seems that those is not need anymore.

Thanks a lot for review, this problem will be fixed at the next version.