Re: [PATCH 14/21] drm/omap: Don't call HPD registration operations recursively
Hi,
On Wed, Jun 06, 2018 at 12:36:43PM +0300, Laurent Pinchart wrote:
> Instead of calling the hot-plug detection callback registration
> operations (.register_hpd_cb() and .unregister_hpd_cb()) recursively
> from the display device back to the first device that provides hot plug
> detection support, iterate over the devices manually in the DRM
> connector code. This moves the complexity to a single central location
> and simplifies the logic in omap_dss_device drivers.
>
> Signed-off-by: Laurent Pinchart
> ---
Reviewed-by: Sebastian Reichel
-- Sebastian
> drivers/gpu/drm/omapdrm/displays/connector-dvi.c | 8 ++-
> drivers/gpu/drm/omapdrm/displays/connector-hdmi.c | 67 --
> .../gpu/drm/omapdrm/displays/encoder-tpd12s015.c | 3 +-
> drivers/gpu/drm/omapdrm/omap_connector.c | 79
> ++
> 4 files changed, 88 insertions(+), 69 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
> b/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
> index f1674b3eee50..e9353e4cd297 100644
> --- a/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
> +++ b/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
> @@ -372,8 +372,12 @@ static int dvic_probe(struct platform_device *pdev)
> dssdev->type = OMAP_DISPLAY_TYPE_DVI;
> dssdev->owner = THIS_MODULE;
> dssdev->of_ports = BIT(0);
> - dssdev->ops_flags = ddata->hpd_gpio || ddata->i2c_adapter
> - ? OMAP_DSS_DEVICE_OP_DETECT : 0;
> +
> + if (ddata->hpd_gpio)
> + dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
> + | OMAP_DSS_DEVICE_OP_HPD;
> + else if (ddata->i2c_adapter)
> + dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT;
>
> omapdss_display_init(dssdev);
> omapdss_device_register(dssdev);
> diff --git a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
> b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
> index 0d22d7004c98..8eae973474dd 100644
> --- a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
> +++ b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
> @@ -153,62 +153,53 @@ static int hdmic_register_hpd_cb(struct omap_dss_device
> *dssdev,
>void *cb_data)
> {
> struct panel_drv_data *ddata = to_panel_data(dssdev);
> - struct omap_dss_device *src = dssdev->src;
>
> - if (ddata->hpd_gpio) {
> - mutex_lock(>hpd_lock);
> - ddata->hpd_cb = cb;
> - ddata->hpd_cb_data = cb_data;
> - mutex_unlock(>hpd_lock);
> - return 0;
> - } else if (src->ops->register_hpd_cb) {
> - return src->ops->register_hpd_cb(src, cb, cb_data);
> - }
> + if (!ddata->hpd_gpio)
> + return -ENOTSUPP;
>
> - return -ENOTSUPP;
> + mutex_lock(>hpd_lock);
> + ddata->hpd_cb = cb;
> + ddata->hpd_cb_data = cb_data;
> + mutex_unlock(>hpd_lock);
> +
> + return 0;
> }
>
> static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
> {
> struct panel_drv_data *ddata = to_panel_data(dssdev);
> - struct omap_dss_device *src = dssdev->src;
>
> - if (ddata->hpd_gpio) {
> - mutex_lock(>hpd_lock);
> - ddata->hpd_cb = NULL;
> - ddata->hpd_cb_data = NULL;
> - mutex_unlock(>hpd_lock);
> - } else if (src->ops->unregister_hpd_cb) {
> - src->ops->unregister_hpd_cb(src);
> - }
> + if (!ddata->hpd_gpio)
> + return;
> +
> + mutex_lock(>hpd_lock);
> + ddata->hpd_cb = NULL;
> + ddata->hpd_cb_data = NULL;
> + mutex_unlock(>hpd_lock);
> }
>
> static void hdmic_enable_hpd(struct omap_dss_device *dssdev)
> {
> struct panel_drv_data *ddata = to_panel_data(dssdev);
> - struct omap_dss_device *src = dssdev->src;
>
> - if (ddata->hpd_gpio) {
> - mutex_lock(>hpd_lock);
> - ddata->hpd_enabled = true;
> - mutex_unlock(>hpd_lock);
> - } else if (src->ops->enable_hpd) {
> - src->ops->enable_hpd(src);
> - }
> + if (!ddata->hpd_gpio)
> + return;
> +
> + mutex_lock(>hpd_lock);
> + ddata->hpd_enabled = true;
> + mutex_unlock(>hpd_lock);
> }
>
> static void hdmic_disable_hpd(struct omap_dss_device *dssdev)
> {
> struct panel_drv_data *ddata = to_panel_data(dssdev);
> - struct omap_dss_device *src = dssdev->src;
>
> - if (ddata->hpd_gpio) {
> - mutex_lock(>hpd_lock);
> - ddata->hpd_enabled = false;
> - mutex_unlock(>hpd_lock);
> - } else if (src->ops->disable_hpd) {
> - src->ops->disable_hpd(src);
> - }
> + if (!ddata->hpd_gpio)
> + return;
> +
> + mutex_lock(>hpd_lock);
> + ddata->hpd_enabled = false;
> + mutex_unlock(>hpd_lock);
> }
>
> static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool
> hdmi_mode)
> @@ -314,7 +305,9 @@ static
[PATCH 14/21] drm/omap: Don't call HPD registration operations recursively
Instead of calling the hot-plug detection callback registration
operations (.register_hpd_cb() and .unregister_hpd_cb()) recursively
from the display device back to the first device that provides hot plug
detection support, iterate over the devices manually in the DRM
connector code. This moves the complexity to a single central location
and simplifies the logic in omap_dss_device drivers.
Signed-off-by: Laurent Pinchart
---
drivers/gpu/drm/omapdrm/displays/connector-dvi.c | 8 ++-
drivers/gpu/drm/omapdrm/displays/connector-hdmi.c | 67 --
.../gpu/drm/omapdrm/displays/encoder-tpd12s015.c | 3 +-
drivers/gpu/drm/omapdrm/omap_connector.c | 79 ++
4 files changed, 88 insertions(+), 69 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
b/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
index f1674b3eee50..e9353e4cd297 100644
--- a/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
+++ b/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
@@ -372,8 +372,12 @@ static int dvic_probe(struct platform_device *pdev)
dssdev->type = OMAP_DISPLAY_TYPE_DVI;
dssdev->owner = THIS_MODULE;
dssdev->of_ports = BIT(0);
- dssdev->ops_flags = ddata->hpd_gpio || ddata->i2c_adapter
- ? OMAP_DSS_DEVICE_OP_DETECT : 0;
+
+ if (ddata->hpd_gpio)
+ dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
+ | OMAP_DSS_DEVICE_OP_HPD;
+ else if (ddata->i2c_adapter)
+ dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT;
omapdss_display_init(dssdev);
omapdss_device_register(dssdev);
diff --git a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
index 0d22d7004c98..8eae973474dd 100644
--- a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
+++ b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
@@ -153,62 +153,53 @@ static int hdmic_register_hpd_cb(struct omap_dss_device
*dssdev,
void *cb_data)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
- struct omap_dss_device *src = dssdev->src;
- if (ddata->hpd_gpio) {
- mutex_lock(>hpd_lock);
- ddata->hpd_cb = cb;
- ddata->hpd_cb_data = cb_data;
- mutex_unlock(>hpd_lock);
- return 0;
- } else if (src->ops->register_hpd_cb) {
- return src->ops->register_hpd_cb(src, cb, cb_data);
- }
+ if (!ddata->hpd_gpio)
+ return -ENOTSUPP;
- return -ENOTSUPP;
+ mutex_lock(>hpd_lock);
+ ddata->hpd_cb = cb;
+ ddata->hpd_cb_data = cb_data;
+ mutex_unlock(>hpd_lock);
+
+ return 0;
}
static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
- struct omap_dss_device *src = dssdev->src;
- if (ddata->hpd_gpio) {
- mutex_lock(>hpd_lock);
- ddata->hpd_cb = NULL;
- ddata->hpd_cb_data = NULL;
- mutex_unlock(>hpd_lock);
- } else if (src->ops->unregister_hpd_cb) {
- src->ops->unregister_hpd_cb(src);
- }
+ if (!ddata->hpd_gpio)
+ return;
+
+ mutex_lock(>hpd_lock);
+ ddata->hpd_cb = NULL;
+ ddata->hpd_cb_data = NULL;
+ mutex_unlock(>hpd_lock);
}
static void hdmic_enable_hpd(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
- struct omap_dss_device *src = dssdev->src;
- if (ddata->hpd_gpio) {
- mutex_lock(>hpd_lock);
- ddata->hpd_enabled = true;
- mutex_unlock(>hpd_lock);
- } else if (src->ops->enable_hpd) {
- src->ops->enable_hpd(src);
- }
+ if (!ddata->hpd_gpio)
+ return;
+
+ mutex_lock(>hpd_lock);
+ ddata->hpd_enabled = true;
+ mutex_unlock(>hpd_lock);
}
static void hdmic_disable_hpd(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
- struct omap_dss_device *src = dssdev->src;
- if (ddata->hpd_gpio) {
- mutex_lock(>hpd_lock);
- ddata->hpd_enabled = false;
- mutex_unlock(>hpd_lock);
- } else if (src->ops->disable_hpd) {
- src->ops->disable_hpd(src);
- }
+ if (!ddata->hpd_gpio)
+ return;
+
+ mutex_lock(>hpd_lock);
+ ddata->hpd_enabled = false;
+ mutex_unlock(>hpd_lock);
}
static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
@@ -314,7 +305,9 @@ static int hdmic_probe(struct platform_device *pdev)
dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
dssdev->owner = THIS_MODULE;
dssdev->of_ports = BIT(0);
- dssdev->ops_flags = ddata->hpd_gpio ? OMAP_DSS_DEVICE_OP_DETECT :
