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Date: Tue, 17 Oct 2017 14:18:39 -0400
From: Sean Paul <seanpaul@...omium.org>
To: Jeffy Chen <jeffy.chen@...k-chips.com>
Cc: linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
heiko@...ech.de, briannorris@...omium.org, rjw@...ysocki.net,
dianders@...omium.org, tfiga@...omium.org, broonie@...nel.org,
seanpaul@...omium.org, Andrzej Hajda <a.hajda@...sung.com>,
dri-devel@...ts.freedesktop.org, Caesar Wang <wxt@...k-chips.com>,
David Airlie <airlied@...ux.ie>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
linux-samsung-soc@...r.kernel.org,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Inki Dae <inki.dae@...sung.com>,
linux-rockchip@...ts.infradead.org,
Kyungmin Park <kyungmin.park@...sung.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Kukjin Kim <kgene@...nel.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Vincent Abriou <vincent.abriou@...com>,
zain wang <wzz@...k-chips.com>,
Archit Taneja <architt@...eaurora.org>,
Joonyoung Shim <jy0922.shim@...sung.com>,
linux-arm-kernel@...ts.infradead.org,
Marek Szyprowski <m.szyprowski@...sung.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Mark Yao <mark.yao@...k-chips.com>,
Jingoo Han <jingoohan1@...il.com>
Subject: Re: [RFC PATCH v4 6/8] drm/bridge/analogix: Do not use device's
drvdata
On Tue, Oct 17, 2017 at 06:16:22PM +0800, Jeffy Chen wrote:
> From: Tomasz Figa <tfiga@...omium.org>
>
> The driver that instantiates the bridge should own the drvdata, as all
> driver model callbacks (probe, remove, shutdown, PM ops, etc.) are also
> owned by its driver struct. Moreover, storing two different pointer
> types in driver data depending on driver initialization status is barely
> a good practice and in fact has led to many bugs in this driver.
>
> Let's clean up this mess and change Analogix entry points to simply
> accept some opaque struct pointer, adjusting their users at the same
> time to avoid breaking the compilation.
>
> Signed-off-by: Tomasz Figa <tfiga@...omium.org>
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
Reviewed-by: Sean Paul <seanpaul@...omium.org>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 50 +++++++++-------------
> drivers/gpu/drm/exynos/exynos_dp.c | 26 ++++++-----
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 47 +++++++++++---------
> include/drm/bridge/analogix_dp.h | 19 ++++----
> 4 files changed, 73 insertions(+), 69 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 5dd3f1cd074a..74d274b6d31d 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -98,17 +98,15 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
> return 0;
> }
>
> -int analogix_dp_psr_supported(struct device *dev)
> +int analogix_dp_psr_supported(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = dev_get_drvdata(dev);
>
> return dp->psr_support;
> }
> EXPORT_SYMBOL_GPL(analogix_dp_psr_supported);
>
> -int analogix_dp_enable_psr(struct device *dev)
> +int analogix_dp_enable_psr(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = dev_get_drvdata(dev);
> struct edp_vsc_psr psr_vsc;
>
> if (!dp->psr_support)
> @@ -129,9 +127,8 @@ int analogix_dp_enable_psr(struct device *dev)
> }
> EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
>
> -int analogix_dp_disable_psr(struct device *dev)
> +int analogix_dp_disable_psr(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = dev_get_drvdata(dev);
> struct edp_vsc_psr psr_vsc;
> int ret;
>
> @@ -1281,8 +1278,9 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
> return analogix_dp_transfer(dp, msg);
> }
>
> -int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> - struct analogix_dp_plat_data *plat_data)
> +struct analogix_dp_device *
> +analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> + struct analogix_dp_plat_data *plat_data)
> {
> struct platform_device *pdev = to_platform_device(dev);
> struct analogix_dp_device *dp;
> @@ -1292,14 +1290,12 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>
> if (!plat_data) {
> dev_err(dev, "Invalided input plat_data\n");
> - return -EINVAL;
> + return ERR_PTR(-EINVAL);
> }
>
> dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL);
> if (!dp)
> - return -ENOMEM;
> -
> - dev_set_drvdata(dev, dp);
> + return ERR_PTR(-ENOMEM);
>
> dp->dev = &pdev->dev;
> dp->dpms_mode = DRM_MODE_DPMS_OFF;
> @@ -1316,7 +1312,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>
> ret = analogix_dp_dt_parse_pdata(dp);
> if (ret)
> - return ret;
> + return ERR_PTR(ret);
>
> dp->phy = devm_phy_get(dp->dev, "dp");
> if (IS_ERR(dp->phy)) {
> @@ -1330,14 +1326,14 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> if (ret == -ENOSYS || ret == -ENODEV)
> dp->phy = NULL;
> else
> - return ret;
> + return ERR_PTR(ret);
> }
> }
>
> dp->clock = devm_clk_get(&pdev->dev, "dp");
> if (IS_ERR(dp->clock)) {
> dev_err(&pdev->dev, "failed to get clock\n");
> - return PTR_ERR(dp->clock);
> + return ERR_CAST(dp->clock);
> }
>
> clk_prepare_enable(dp->clock);
> @@ -1346,7 +1342,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>
> dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
> if (IS_ERR(dp->reg_base))
> - return PTR_ERR(dp->reg_base);
> + return ERR_CAST(dp->reg_base);
>
> dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
>
> @@ -1367,7 +1363,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> "hpd_gpio");
> if (ret) {
> dev_err(&pdev->dev, "failed to get hpd gpio\n");
> - return ret;
> + return ERR_PTR(ret);
> }
> dp->irq = gpio_to_irq(dp->hpd_gpio);
> irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
> @@ -1379,7 +1375,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>
> if (dp->irq == -ENXIO) {
> dev_err(&pdev->dev, "failed to get irq\n");
> - return -ENODEV;
> + return ERR_PTR(-ENODEV);
> }
>
> pm_runtime_enable(dev);
> @@ -1420,7 +1416,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> phy_power_off(dp->phy);
> pm_runtime_put(dev);
>
> - return 0;
> + return dp;
>
> err_disable_pm_runtime:
>
> @@ -1428,15 +1424,12 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> pm_runtime_put(dev);
> pm_runtime_disable(dev);
>
> - return ret;
> + return ERR_PTR(ret);
> }
> EXPORT_SYMBOL_GPL(analogix_dp_bind);
>
> -void analogix_dp_unbind(struct device *dev, struct device *master,
> - void *data)
> +void analogix_dp_unbind(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = dev_get_drvdata(dev);
> -
> analogix_dp_bridge_disable(dp->bridge);
> dp->connector.funcs->destroy(&dp->connector);
> dp->encoder->funcs->destroy(dp->encoder);
> @@ -1449,16 +1442,14 @@ void analogix_dp_unbind(struct device *dev, struct device *master,
> }
>
> drm_dp_aux_unregister(&dp->aux);
> - pm_runtime_disable(dev);
> + pm_runtime_disable(dp->dev);
> clk_disable_unprepare(dp->clock);
> }
> EXPORT_SYMBOL_GPL(analogix_dp_unbind);
>
> #ifdef CONFIG_PM
> -int analogix_dp_suspend(struct device *dev)
> +int analogix_dp_suspend(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = dev_get_drvdata(dev);
> -
> clk_disable_unprepare(dp->clock);
>
> if (dp->plat_data->panel) {
> @@ -1470,9 +1461,8 @@ int analogix_dp_suspend(struct device *dev)
> }
> EXPORT_SYMBOL_GPL(analogix_dp_suspend);
>
> -int analogix_dp_resume(struct device *dev)
> +int analogix_dp_resume(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = dev_get_drvdata(dev);
> int ret;
>
> ret = clk_prepare_enable(dp->clock);
> diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
> index 39629e7a80b9..f7e5b2c405ed 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp.c
> @@ -41,6 +41,7 @@ struct exynos_dp_device {
> struct device *dev;
>
> struct videomode vm;
> + struct analogix_dp_device *adp;
> struct analogix_dp_plat_data plat_data;
> };
>
> @@ -157,13 +158,6 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
> struct drm_device *drm_dev = data;
> int ret;
>
> - /*
> - * Just like the probe function said, we don't need the
> - * device drvrate anymore, we should leave the charge to
> - * analogix dp driver, set the device drvdata to NULL.
> - */
> - dev_set_drvdata(dev, NULL);
> -
> dp->dev = dev;
> dp->drm_dev = drm_dev;
>
> @@ -190,13 +184,19 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>
> dp->plat_data.encoder = encoder;
>
> - return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
> + dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
> + if (IS_ERR(dp->adp))
> + return PTR_ERR(dp->adp);
> +
> + return 0;
> }
>
> static void exynos_dp_unbind(struct device *dev, struct device *master,
> void *data)
> {
> - return analogix_dp_unbind(dev, master, data);
> + struct exynos_dp_device *dp = dev_get_drvdata(dev);
> +
> + return analogix_dp_unbind(dp->adp);
> }
>
> static const struct component_ops exynos_dp_ops = {
> @@ -257,12 +257,16 @@ static int exynos_dp_remove(struct platform_device *pdev)
> #ifdef CONFIG_PM
> static int exynos_dp_suspend(struct device *dev)
> {
> - return analogix_dp_suspend(dev);
> + struct exynos_dp_device *dp = dev_get_drvdata(dev);
> +
> + return analogix_dp_suspend(dp->adp);
> }
>
> static int exynos_dp_resume(struct device *dev)
> {
> - return analogix_dp_resume(dev);
> + struct exynos_dp_device *dp = dev_get_drvdata(dev);
> +
> + return analogix_dp_resume(dp->adp);
> }
> #endif
>
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 4b689c0f3fc1..b5f39bf59234 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -77,6 +77,7 @@ struct rockchip_dp_device {
>
> const struct rockchip_dp_chip_data *data;
>
> + struct analogix_dp_device *adp;
> struct analogix_dp_plat_data plat_data;
> };
>
> @@ -85,7 +86,7 @@ static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
> struct rockchip_dp_device *dp = to_dp(encoder);
> unsigned long flags;
>
> - if (!analogix_dp_psr_supported(dp->dev))
> + if (!analogix_dp_psr_supported(dp->adp))
> return;
>
> DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
> @@ -116,9 +117,9 @@ static void analogix_dp_psr_work(struct work_struct *work)
>
> spin_lock_irqsave(&dp->psr_lock, flags);
> if (dp->psr_state == EDP_VSC_PSR_STATE_ACTIVE)
> - analogix_dp_enable_psr(dp->dev);
> + analogix_dp_enable_psr(dp->adp);
> else
> - analogix_dp_disable_psr(dp->dev);
> + analogix_dp_disable_psr(dp->adp);
> spin_unlock_irqrestore(&dp->psr_lock, flags);
> }
>
> @@ -350,13 +351,6 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
> struct drm_device *drm_dev = data;
> int ret;
>
> - /*
> - * Just like the probe function said, we don't need the
> - * device drvrate anymore, we should leave the charge to
> - * analogix dp driver, set the device drvdata to NULL.
> - */
> - dev_set_drvdata(dev, NULL);
> -
> dp_data = of_device_get_match_data(dev);
> if (!dp_data)
> return -ENODEV;
> @@ -387,9 +381,11 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
>
> rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
>
> - ret = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
> - if (ret < 0)
> + dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
> + if (IS_ERR(dp->adp)) {
> + ret = PTR_ERR(dp->adp);
> goto err_unreg_psr;
> + }
> return 0;
>
> err_unreg_psr:
> @@ -407,7 +403,7 @@ static void rockchip_dp_unbind(struct device *dev, struct device *master,
>
> rockchip_drm_psr_unregister(&dp->encoder);
>
> - analogix_dp_unbind(dev, master, data);
> + analogix_dp_unbind(dp->adp);
> clk_disable_unprepare(dp->pclk);
> }
>
> @@ -435,11 +431,6 @@ static int rockchip_dp_probe(struct platform_device *pdev)
>
> dp->plat_data.panel = panel;
>
> - /*
> - * We just use the drvdata until driver run into component
> - * add function, and then we would set drvdata to null, so
> - * that analogix dp driver could take charge of the drvdata.
> - */
> platform_set_drvdata(pdev, dp);
>
> return component_add(dev, &rockchip_dp_component_ops);
> @@ -452,10 +443,26 @@ static int rockchip_dp_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int rockchip_dp_suspend(struct device *dev)
> +{
> + struct rockchip_dp_device *dp = dev_get_drvdata(dev);
> +
> + return analogix_dp_suspend(dp->adp);
> +}
> +
> +static int rockchip_dp_resume(struct device *dev)
> +{
> + struct rockchip_dp_device *dp = dev_get_drvdata(dev);
> +
> + return analogix_dp_resume(dp->adp);
> +}
> +#endif
> +
> static const struct dev_pm_ops rockchip_dp_pm_ops = {
> #ifdef CONFIG_PM_SLEEP
> - .suspend = analogix_dp_suspend,
> - .resume_early = analogix_dp_resume,
> + .suspend = rockchip_dp_suspend,
> + .resume_early = rockchip_dp_resume,
> #endif
> };
>
> diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
> index c99d6eaef1ac..5518fc75dd6e 100644
> --- a/include/drm/bridge/analogix_dp.h
> +++ b/include/drm/bridge/analogix_dp.h
> @@ -13,6 +13,8 @@
>
> #include <drm/drm_crtc.h>
>
> +struct analogix_dp_device;
> +
> enum analogix_dp_devtype {
> EXYNOS_DP,
> RK3288_DP,
> @@ -38,16 +40,17 @@ struct analogix_dp_plat_data {
> struct drm_connector *);
> };
>
> -int analogix_dp_psr_supported(struct device *dev);
> -int analogix_dp_enable_psr(struct device *dev);
> -int analogix_dp_disable_psr(struct device *dev);
> +int analogix_dp_psr_supported(struct analogix_dp_device *dp);
> +int analogix_dp_enable_psr(struct analogix_dp_device *dp);
> +int analogix_dp_disable_psr(struct analogix_dp_device *dp);
>
> -int analogix_dp_resume(struct device *dev);
> -int analogix_dp_suspend(struct device *dev);
> +int analogix_dp_resume(struct analogix_dp_device *dp);
> +int analogix_dp_suspend(struct analogix_dp_device *dp);
>
> -int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> - struct analogix_dp_plat_data *plat_data);
> -void analogix_dp_unbind(struct device *dev, struct device *master, void *data);
> +struct analogix_dp_device *
> +analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> + struct analogix_dp_plat_data *plat_data);
> +void analogix_dp_unbind(struct analogix_dp_device *dp);
>
> int analogix_dp_start_crc(struct drm_connector *connector);
> int analogix_dp_stop_crc(struct drm_connector *connector);
> --
> 2.11.0
>
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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