[PATCH] drm/bridge: analogix_dp: Split bind() into probe() and real bind()
Andrzej Hajda
a.hajda at samsung.com
Tue Mar 3 12:38:24 UTC 2020
On 02.03.2020 15:26, Marek Szyprowski wrote:
> Analogix_dp driver acquires all its resources in ->bind() callback, what
> is a bit against the driver component based approach, where driver
> initialization is split into probe(), where all resources are gathered, and
> bind(), where objects are created and compound driver is initialized.
> Extract resource related operations to analogix_dp_probe() and
> analogix_dp_remove() and call them before/after registration of the device
> components from the main Exynos and Rockchip DP drivers.
>
> This fixes multiple tries of DRM compound driver bind() when example when
> DP PHY driver is not yet loaded/probed():
>
> [drm] Exynos DRM: using 14400000.fimd device for DMA mapping operations
> exynos-drm exynos-drm: bound 14400000.fimd (ops fimd_component_ops [exynosdrm])
> exynos-drm exynos-drm: bound 14450000.mixer (ops mixer_component_ops [exynosdrm])
> exynos-dp 145b0000.dp-controller: no DP phy configured
> exynos-drm exynos-drm: failed to bind 145b0000.dp-controller (ops exynos_dp_ops [exynosdrm]): -517
> exynos-drm exynos-drm: master bind failed: -517
> ...
> [drm] Exynos DRM: using 14400000.fimd device for DMA mapping operations
> exynos-drm exynos-drm: bound 14400000.fimd (ops hdmi_enable [exynosdrm])
> exynos-drm exynos-drm: bound 14450000.mixer (ops hdmi_enable [exynosdrm])
> exynos-drm exynos-drm: bound 145b0000.dp-controller (ops hdmi_enable [exynosdrm])
> exynos-drm exynos-drm: bound 14530000.hdmi (ops hdmi_enable [exynosdrm])
> [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> Console: switching to colour frame buffer device 170x48
> exynos-drm exynos-drm: fb0: exynosdrmfb frame buffer device
> [drm] Initialized exynos 1.1.0 20180330 for exynos-drm on minor 1
> ...
>
> Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
I hope someone with rockchip will test the patch.
I am little bit worried about power/resource management:
1. dp->clock enabled in probe.
2. pm_runtime enabled in bind.
Both seems to me too early, but it could be hw issue and should be
addressed in separate patches if possible.
As I understand the patch tries to split things without changing order
of calls, so for me it is OK:
Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>
--
Regards
Andrzej
> ---
> .../drm/bridge/analogix/analogix_dp_core.c | 33 ++++++++++++-------
> drivers/gpu/drm/exynos/exynos_dp.c | 15 ++++++---
> .../gpu/drm/rockchip/analogix_dp-rockchip.c | 15 +++++----
> include/drm/bridge/analogix_dp.h | 5 +--
> 4 files changed, 44 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index dfb59a5fefea..a89a03b66bf2 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -1646,8 +1646,7 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
> }
>
> struct analogix_dp_device *
> -analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> - struct analogix_dp_plat_data *plat_data)
> +analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
> {
> struct platform_device *pdev = to_platform_device(dev);
> struct analogix_dp_device *dp;
> @@ -1750,22 +1749,30 @@ analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> irq_flags, "analogix-dp", dp);
> if (ret) {
> dev_err(&pdev->dev, "failed to request irq\n");
> - goto err_disable_pm_runtime;
> + return ERR_PTR(ret);
> }
> disable_irq(dp->irq);
>
> + return dp;
> +}
> +EXPORT_SYMBOL_GPL(analogix_dp_probe);
> +
> +int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
> +{
> + int ret;
> +
> dp->drm_dev = drm_dev;
> dp->encoder = dp->plat_data->encoder;
>
> dp->aux.name = "DP-AUX";
> dp->aux.transfer = analogix_dpaux_transfer;
> - dp->aux.dev = &pdev->dev;
> + dp->aux.dev = dp->dev;
>
> ret = drm_dp_aux_register(&dp->aux);
> if (ret)
> - return ERR_PTR(ret);
> + return ret;
>
> - pm_runtime_enable(dev);
> + pm_runtime_enable(dp->dev);
>
> ret = analogix_dp_create_bridge(drm_dev, dp);
> if (ret) {
> @@ -1773,13 +1780,12 @@ analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> goto err_disable_pm_runtime;
> }
>
> - return dp;
> + return 0;
>
> err_disable_pm_runtime:
> + pm_runtime_disable(dp->dev);
>
> - pm_runtime_disable(dev);
> -
> - return ERR_PTR(ret);
> + return ret;
> }
> EXPORT_SYMBOL_GPL(analogix_dp_bind);
>
> @@ -1796,10 +1802,15 @@ void analogix_dp_unbind(struct analogix_dp_device *dp)
>
> drm_dp_aux_unregister(&dp->aux);
> pm_runtime_disable(dp->dev);
> - clk_disable_unprepare(dp->clock);
> }
> EXPORT_SYMBOL_GPL(analogix_dp_unbind);
>
> +void analogix_dp_remove(struct analogix_dp_device *dp)
> +{
> + clk_disable_unprepare(dp->clock);
> +}
> +EXPORT_SYMBOL_GPL(analogix_dp_remove);
> +
> #ifdef CONFIG_PM
> int analogix_dp_suspend(struct analogix_dp_device *dp)
> {
> diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
> index 4785885c0f4f..558b78e8cc32 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp.c
> @@ -184,13 +184,11 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>
> dp->plat_data.encoder = encoder;
>
> - dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
> - if (IS_ERR(dp->adp)) {
> + ret = analogix_dp_bind(dp->adp, dp->drm_dev);
> + if (ret)
> dp->encoder.funcs->destroy(&dp->encoder);
> - return PTR_ERR(dp->adp);
> - }
>
> - return 0;
> + return ret;
> }
>
> static void exynos_dp_unbind(struct device *dev, struct device *master,
> @@ -250,12 +248,19 @@ static int exynos_dp_probe(struct platform_device *pdev)
> dp->ptn_bridge = bridge;
>
> out:
> + dp->adp = analogix_dp_probe(dev, &dp->plat_data);
> + if (IS_ERR(dp->adp))
> + return PTR_ERR(dp->adp);
> +
> return component_add(&pdev->dev, &exynos_dp_ops);
> }
>
> static int exynos_dp_remove(struct platform_device *pdev)
> {
> + struct exynos_dp_device *dp = platform_get_drvdata(pdev);
> +
> component_del(&pdev->dev, &exynos_dp_ops);
> + analogix_dp_remove(dp->adp);
>
> return 0;
> }
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index f38f5e113c6b..b85cf2582864 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -349,11 +349,9 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
> dp->plat_data.power_off = rockchip_dp_powerdown;
> dp->plat_data.get_modes = rockchip_dp_get_modes;
>
> - dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
> - if (IS_ERR(dp->adp)) {
> - ret = PTR_ERR(dp->adp);
> + ret = analogix_dp_bind(dp->adp, drm_dev);
> + if (ret)
> goto err_cleanup_encoder;
> - }
>
> return 0;
> err_cleanup_encoder:
> @@ -368,8 +366,6 @@ static void rockchip_dp_unbind(struct device *dev, struct device *master,
>
> analogix_dp_unbind(dp->adp);
> dp->encoder.funcs->destroy(&dp->encoder);
> -
> - dp->adp = ERR_PTR(-ENODEV);
> }
>
> static const struct component_ops rockchip_dp_component_ops = {
> @@ -402,12 +398,19 @@ static int rockchip_dp_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, dp);
>
> + dp->adp = analogix_dp_probe(dev, &dp->plat_data);
> + if (IS_ERR(dp->adp))
> + return PTR_ERR(dp->adp);
> +
> return component_add(dev, &rockchip_dp_component_ops);
> }
>
> static int rockchip_dp_remove(struct platform_device *pdev)
> {
> + struct rockchip_dp_device *dp = platform_get_drvdata(pdev);
> +
> component_del(&pdev->dev, &rockchip_dp_component_ops);
> + analogix_dp_remove(dp->adp);
>
> return 0;
> }
> diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
> index 7aa2f93da49c..b0dcc07334a1 100644
> --- a/include/drm/bridge/analogix_dp.h
> +++ b/include/drm/bridge/analogix_dp.h
> @@ -42,9 +42,10 @@ int analogix_dp_resume(struct analogix_dp_device *dp);
> int analogix_dp_suspend(struct analogix_dp_device *dp);
>
> struct analogix_dp_device *
> -analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> - struct analogix_dp_plat_data *plat_data);
> +analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data);
> +int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev);
> void analogix_dp_unbind(struct analogix_dp_device *dp);
> +void analogix_dp_remove(struct analogix_dp_device *dp);
>
> int analogix_dp_start_crc(struct drm_connector *connector);
> int analogix_dp_stop_crc(struct drm_connector *connector);
More information about the dri-devel
mailing list