Re: [Freedreno] [PATCH v2 3/5] drm/msm/hdmi: move resource allocation to probe function

[Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>]

On 9/7/2022 11:54 AM, Abhinav Kumar wrote:
> On 8/26/2022 2:39 AM, Dmitry Baryshkov wrote:
> > Rather than having all resource allocation happen in the _bind function
> > (resulting in possible EPROBE_DEFER returns and component bind/unbind
> > cycles) allocate and check all resources in _probe function. While we
> > are at it, use platform_get_irq() to get the IRQ rather than going
> > through the irq_of_parse_and_map().
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/msm/hdmi/hdmi.c | 303 +++++++++++++++-----------------
> >   1 file changed, 138 insertions(+), 165 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c 
> > b/drivers/gpu/drm/msm/hdmi/hdmi.c
> > index 4a364d8f4c0b..c298a36f3b42 100644
> > --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> > +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> > @@ -76,8 +76,6 @@ static void msm_hdmi_destroy(struct hdmi *hdmi)
> >       if (hdmi->i2c)
> >           msm_hdmi_i2c_destroy(hdmi->i2c);
> > -
> > -    platform_set_drvdata(hdmi->pdev, NULL);
> >   }
> >   static int msm_hdmi_get_phy(struct hdmi *hdmi)
>
> Between v1 and v2, it just seems like a rebase to me on top of the 6.1 
> MR. But what about moving msm_hdmi_get_phy() to probe(). I thought you 
> were going to check that as well for v2.

Please ignore this part of the comment, I see that moving 
msm_hdmi_get_phy() to probe() is in the patch 5 of this series.

Thanks for making that change.

The below comment still holds true.

> A change log would have been nice here. Because as part of the rebase 
> looks like we even migrate to using panel bridge for hdmi driver.
>
> Usage of drm_of_find_panel_or_bridge was not present in v1 and wasnt 
> obvious from the commit text either.
>
> > @@ -117,142 +115,10 @@ static int msm_hdmi_get_phy(struct hdmi *hdmi)
> >    * we are to EPROBE_DEFER we want to do it here, rather than later
> >    * at modeset_init() time
> >    */
> > -static struct hdmi *msm_hdmi_init(struct platform_device *pdev)
> > +static int msm_hdmi_init(struct hdmi *hdmi)
> >   {
> > -    struct hdmi_platform_config *config = pdev->dev.platform_data;
> > -    struct hdmi *hdmi = NULL;
> > -    struct resource *res;
> > -    int i, ret;
> > -
> > -    hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
> > -    if (!hdmi) {
> > -        ret = -ENOMEM;
> > -        goto fail;
> > -    }
> > -
> > -    hdmi->pdev = pdev;
> > -    hdmi->config = config;
> > -    spin_lock_init(&hdmi->reg_lock);
> > -
> > -    ret = drm_of_find_panel_or_bridge(pdev->dev.of_node, 1, 0, NULL, 
> > &hdmi->next_bridge);
> > -    if (ret && ret != -ENODEV)
> > -        goto fail;
> > -
> > -    hdmi->mmio = msm_ioremap(pdev, "core_physical");
> > -    if (IS_ERR(hdmi->mmio)) {
> > -        ret = PTR_ERR(hdmi->mmio);
> > -        goto fail;
> > -    }
> > -
> > -    /* HDCP needs physical address of hdmi register */
> > -    res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > -        "core_physical");
> > -    if (!res) {
> > -        ret = -EINVAL;
> > -        goto fail;
> > -    }
> > -    hdmi->mmio_phy_addr = res->start;
> > -
> > -    hdmi->qfprom_mmio = msm_ioremap(pdev, "qfprom_physical");
> > -    if (IS_ERR(hdmi->qfprom_mmio)) {
> > -        DRM_DEV_INFO(&pdev->dev, "can't find qfprom resource\n");
> > -        hdmi->qfprom_mmio = NULL;
> > -    }
> > -
> > -    hdmi->hpd_regs = devm_kcalloc(&pdev->dev,
> > -                      config->hpd_reg_cnt,
> > -                      sizeof(hdmi->hpd_regs[0]),
> > -                      GFP_KERNEL);
> > -    if (!hdmi->hpd_regs) {
> > -        ret = -ENOMEM;
> > -        goto fail;
> > -    }
> > -    for (i = 0; i < config->hpd_reg_cnt; i++)
> > -        hdmi->hpd_regs[i].supply = config->hpd_reg_names[i];
> > -
> > -    ret = devm_regulator_bulk_get(&pdev->dev, config->hpd_reg_cnt, 
> > hdmi->hpd_regs);
> > -    if (ret) {
> > -        DRM_DEV_ERROR(&pdev->dev, "failed to get hpd regulator: 
> > %d\n", ret);
> > -        goto fail;
> > -    }
> > -
> > -    hdmi->pwr_regs = devm_kcalloc(&pdev->dev,
> > -                      config->pwr_reg_cnt,
> > -                      sizeof(hdmi->pwr_regs[0]),
> > -                      GFP_KERNEL);
> > -    if (!hdmi->pwr_regs) {
> > -        ret = -ENOMEM;
> > -        goto fail;
> > -    }
> > -
> > -    for (i = 0; i < config->pwr_reg_cnt; i++)
> > -        hdmi->pwr_regs[i].supply = config->pwr_reg_names[i];
> > -
> > -    ret = devm_regulator_bulk_get(&pdev->dev, config->pwr_reg_cnt, 
> > hdmi->pwr_regs);
> > -    if (ret) {
> > -        DRM_DEV_ERROR(&pdev->dev, "failed to get pwr regulator: 
> > %d\n", ret);
> > -        goto fail;
> > -    }
> > -
> > -    hdmi->hpd_clks = devm_kcalloc(&pdev->dev,
> > -                      config->hpd_clk_cnt,
> > -                      sizeof(hdmi->hpd_clks[0]),
> > -                      GFP_KERNEL);
> > -    if (!hdmi->hpd_clks) {
> > -        ret = -ENOMEM;
> > -        goto fail;
> > -    }
> > -    for (i = 0; i < config->hpd_clk_cnt; i++) {
> > -        struct clk *clk;
> > -
> > -        clk = msm_clk_get(pdev, config->hpd_clk_names[i]);
> > -        if (IS_ERR(clk)) {
> > -            ret = PTR_ERR(clk);
> > -            DRM_DEV_ERROR(&pdev->dev, "failed to get hpd clk: %s 
> > (%d)\n",
> > -                    config->hpd_clk_names[i], ret);
> > -            goto fail;
> > -        }
> > -
> > -        hdmi->hpd_clks[i] = clk;
> > -    }
> > -
> > -    hdmi->pwr_clks = devm_kcalloc(&pdev->dev,
> > -                      config->pwr_clk_cnt,
> > -                      sizeof(hdmi->pwr_clks[0]),
> > -                      GFP_KERNEL);
> > -    if (!hdmi->pwr_clks) {
> > -        ret = -ENOMEM;
> > -        goto fail;
> > -    }
> > -    for (i = 0; i < config->pwr_clk_cnt; i++) {
> > -        struct clk *clk;
> > -
> > -        clk = msm_clk_get(pdev, config->pwr_clk_names[i]);
> > -        if (IS_ERR(clk)) {
> > -            ret = PTR_ERR(clk);
> > -            DRM_DEV_ERROR(&pdev->dev, "failed to get pwr clk: %s 
> > (%d)\n",
> > -                    config->pwr_clk_names[i], ret);
> > -            goto fail;
> > -        }
> > -
> > -        hdmi->pwr_clks[i] = clk;
> > -    }
> > -
> > -    hdmi->hpd_gpiod = devm_gpiod_get_optional(&pdev->dev, "hpd", 
> > GPIOD_IN);
> > -    /* This will catch e.g. -EPROBE_DEFER */
> > -    if (IS_ERR(hdmi->hpd_gpiod)) {
> > -        ret = PTR_ERR(hdmi->hpd_gpiod);
> > -        DRM_DEV_ERROR(&pdev->dev, "failed to get hpd gpio: (%d)\n", 
> > ret);
> > -        goto fail;
> > -    }
> > -
> > -    if (!hdmi->hpd_gpiod)
> > -        DBG("failed to get HPD gpio");
> > -
> > -    if (hdmi->hpd_gpiod)
> > -        gpiod_set_consumer_name(hdmi->hpd_gpiod, "HDMI_HPD");
> > -
> > -    devm_pm_runtime_enable(&pdev->dev);
> > +    struct platform_device *pdev = hdmi->pdev;
> > +    int ret;
> >       hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);
> > @@ -276,13 +142,13 @@ static struct hdmi *msm_hdmi_init(struct 
> > platform_device *pdev)
> >           hdmi->hdcp_ctrl = NULL;
> >       }
> > -    return hdmi;
> > +    return 0;
> >   fail:
> >       if (hdmi)
> >           msm_hdmi_destroy(hdmi);
> > -    return ERR_PTR(ret);
> > +    return ret;
> >   }
> >   /* Second part of initialization, the drm/kms level modeset_init,
> > @@ -332,13 +198,6 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
> >       drm_connector_attach_encoder(hdmi->connector, hdmi->encoder);
> > -    hdmi->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
> > -    if (!hdmi->irq) {
> > -        ret = -EINVAL;
> > -        DRM_DEV_ERROR(dev->dev, "failed to get irq\n");
> > -        goto fail;
> > -    }
> > -
> >       ret = devm_request_irq(&pdev->dev, hdmi->irq,
> >               msm_hdmi_irq, IRQF_TRIGGER_HIGH,
> >               "hdmi_isr", hdmi);
> > @@ -358,8 +217,6 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
> >       priv->bridges[priv->num_bridges++]       = hdmi->bridge;
> > -    platform_set_drvdata(pdev, hdmi);
> > -
> >       return 0;
> >   fail:
> > @@ -387,7 +244,7 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
> >   static const char *hpd_reg_names_8960[] = {"core-vdda"};
> >   static const char *hpd_clk_names_8960[] = {"core", "master_iface", 
> > "slave_iface"};
> > -static struct hdmi_platform_config hdmi_tx_8960_config = {
> > +const static struct hdmi_platform_config hdmi_tx_8960_config = {
> >           HDMI_CFG(hpd_reg, 8960),
> >           HDMI_CFG(hpd_clk, 8960),
> >   };
> > @@ -397,7 +254,7 @@ static const char *pwr_clk_names_8x74[] = {"extp", 
> > "alt_iface"};
> >   static const char *hpd_clk_names_8x74[] = {"iface", "core", 
> > "mdp_core"};
> >   static unsigned long hpd_clk_freq_8x74[] = {0, 19200000, 0};
> > -static struct hdmi_platform_config hdmi_tx_8974_config = {
> > +const static struct hdmi_platform_config hdmi_tx_8974_config = {
> >           HDMI_CFG(pwr_reg, 8x74),
> >           HDMI_CFG(pwr_clk, 8x74),
> >           HDMI_CFG(hpd_clk, 8x74),
> > @@ -512,23 +369,12 @@ static int msm_hdmi_register_audio_driver(struct 
> > hdmi *hdmi, struct device *dev)
> >   static int msm_hdmi_bind(struct device *dev, struct device *master, 
> > void *data)
> >   {
> >       struct msm_drm_private *priv = dev_get_drvdata(master);
> > -    struct hdmi_platform_config *hdmi_cfg;
> > -    struct hdmi *hdmi;
> > -    struct device_node *of_node = dev->of_node;
> > +    struct hdmi *hdmi = dev_get_drvdata(dev);
> >       int err;
> > -    hdmi_cfg = (struct hdmi_platform_config *)
> > -            of_device_get_match_data(dev);
> > -    if (!hdmi_cfg) {
> > -        DRM_DEV_ERROR(dev, "unknown hdmi_cfg: %pOFn\n", of_node);
> > -        return -ENXIO;
> > -    }
> > -
> > -    dev->platform_data = hdmi_cfg;
> > -
> > -    hdmi = msm_hdmi_init(to_platform_device(dev));
> > -    if (IS_ERR(hdmi))
> > -        return PTR_ERR(hdmi);
> > +    err = msm_hdmi_init(hdmi);
> > +    if (err)
> > +        return err;
> >       priv->hdmi = hdmi;
> >       err = msm_hdmi_register_audio_driver(hdmi, dev);
> > @@ -561,6 +407,133 @@ static const struct component_ops msm_hdmi_ops = {
> >   static int msm_hdmi_dev_probe(struct platform_device *pdev)
> >   {
> > +    const struct hdmi_platform_config *config;
> > +    struct device *dev = &pdev->dev;
> > +    struct hdmi *hdmi;
> > +    struct resource *res;
> > +    int i, ret;
> > +
> > +    config = of_device_get_match_data(dev);
> > +    if (!config)
> > +        return -EINVAL;
> > +
> > +    hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
> > +    if (!hdmi)
> > +        return -ENOMEM;
> > +
> > +    hdmi->pdev = pdev;
> > +    hdmi->config = config;
> > +    spin_lock_init(&hdmi->reg_lock);
> > +
> > +    ret = drm_of_find_panel_or_bridge(pdev->dev.of_node, 1, 0, NULL, 
> > &hdmi->next_bridge);
> > +    if (ret && ret != -ENODEV)
> > +        return ret;
> > +
> > +    hdmi->mmio = msm_ioremap(pdev, "core_physical");
> > +    if (IS_ERR(hdmi->mmio))
> > +        return PTR_ERR(hdmi->mmio);
> > +
> > +    /* HDCP needs physical address of hdmi register */
> > +    res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > +        "core_physical");
> > +    if (!res)
> > +        return -EINVAL;
> > +    hdmi->mmio_phy_addr = res->start;
> > +
> > +    hdmi->qfprom_mmio = msm_ioremap(pdev, "qfprom_physical");
> > +    if (IS_ERR(hdmi->qfprom_mmio)) {
> > +        DRM_DEV_INFO(&pdev->dev, "can't find qfprom resource\n");
> > +        hdmi->qfprom_mmio = NULL;
> > +    }
> > +
> > +    hdmi->irq = platform_get_irq(pdev, 0);
> > +    if (hdmi->irq < 0)
> > +        return hdmi->irq;
> > +
> > +    hdmi->hpd_regs = devm_kcalloc(&pdev->dev,
> > +                      config->hpd_reg_cnt,
> > +                      sizeof(hdmi->hpd_regs[0]),
> > +                      GFP_KERNEL);
> > +    if (!hdmi->hpd_regs)
> > +        return -ENOMEM;
> > +
> > +    for (i = 0; i < config->hpd_reg_cnt; i++)
> > +        hdmi->hpd_regs[i].supply = config->hpd_reg_names[i];
> > +
> > +    ret = devm_regulator_bulk_get(&pdev->dev, config->hpd_reg_cnt, 
> > hdmi->hpd_regs);
> > +    if (ret)
> > +        return dev_err_probe(dev, ret, "failed to get hpd 
> > regulators\n");
> > +
> > +    hdmi->pwr_regs = devm_kcalloc(&pdev->dev,
> > +                      config->pwr_reg_cnt,
> > +                      sizeof(hdmi->pwr_regs[0]),
> > +                      GFP_KERNEL);
> > +    if (!hdmi->pwr_regs)
> > +        return -ENOMEM;
> > +
> > +    for (i = 0; i < config->pwr_reg_cnt; i++)
> > +        hdmi->pwr_regs[i].supply = config->pwr_reg_names[i];
> > +
> > +    ret = devm_regulator_bulk_get(&pdev->dev, config->pwr_reg_cnt, 
> > hdmi->pwr_regs);
> > +    if (ret)
> > +        return dev_err_probe(dev, ret, "failed to get pwr 
> > regulators\n");
> > +
> > +    hdmi->hpd_clks = devm_kcalloc(&pdev->dev,
> > +                      config->hpd_clk_cnt,
> > +                      sizeof(hdmi->hpd_clks[0]),
> > +                      GFP_KERNEL);
> > +    if (!hdmi->hpd_clks)
> > +        return -ENOMEM;
> > +
> > +    for (i = 0; i < config->hpd_clk_cnt; i++) {
> > +        struct clk *clk;
> > +
> > +        clk = msm_clk_get(pdev, config->hpd_clk_names[i]);
> > +        if (IS_ERR(clk))
> > +            return dev_err_probe(dev, PTR_ERR(clk),
> > +                         "failed to get hpd clk: %s\n",
> > +                         config->hpd_clk_names[i]);
> > +
> > +        hdmi->hpd_clks[i] = clk;
> > +    }
> > +
> > +    hdmi->pwr_clks = devm_kcalloc(&pdev->dev,
> > +                      config->pwr_clk_cnt,
> > +                      sizeof(hdmi->pwr_clks[0]),
> > +                      GFP_KERNEL);
> > +    if (!hdmi->pwr_clks)
> > +        return -ENOMEM;
> > +
> > +    for (i = 0; i < config->pwr_clk_cnt; i++) {
> > +        struct clk *clk;
> > +
> > +        clk = msm_clk_get(pdev, config->pwr_clk_names[i]);
> > +        if (IS_ERR(clk))
> > +            return dev_err_probe(dev, PTR_ERR(clk),
> > +                         "failed to get pwr clk: %s\n",
> > +                         config->pwr_clk_names[i]);
> > +
> > +        hdmi->pwr_clks[i] = clk;
> > +    }
> > +
> > +    hdmi->hpd_gpiod = devm_gpiod_get_optional(&pdev->dev, "hpd", 
> > GPIOD_IN);
> > +    /* This will catch e.g. -EPROBE_DEFER */
> > +    if (IS_ERR(hdmi->hpd_gpiod))
> > +        return dev_err_probe(dev, PTR_ERR(hdmi->hpd_gpiod),
> > +                     "failed to get hpd gpio\n");
> > +
> > +    if (!hdmi->hpd_gpiod)
> > +        DBG("failed to get HPD gpio");
> > +
> > +    if (hdmi->hpd_gpiod)
> > +        gpiod_set_consumer_name(hdmi->hpd_gpiod, "HDMI_HPD");
> > +
> > +    ret = devm_pm_runtime_enable(&pdev->dev);
> > +    if (ret)
> > +        return ret;
> > +
> > +    platform_set_drvdata(pdev, hdmi);
> > +
> >       return component_add(&pdev->dev, &msm_hdmi_ops);
> >   }