Currently, the DSI host blocks binding the display pipeline until the panel is available. This unnecessarily prevents other display outpus from working, and adds logspam to dmesg when the panel driver is built as a module (the component master is unsuccessfully brought up several times during boot).

Flip the dependency, instead requiring the host to be bound before the panel is attached. The panel driver provides no functionality outside of the display pipeline anyway.

Since the panel is now probed after the DRM connector, we need a hotplug event to turn on the connector after the panel is attached.

This has the added benefit of fixing panel module removal/insertion. Previously, the panel would be turned off when its module was removed. But because the connector state was hardcoded, nothing knew to turn the panel back on when it was re-attached. Now, with hotplug events available, the connector state will follow the panel module state, and the panel will be re-enabled properly.

Fixes: 133add5b5ad4 ("drm/sun4i: Add Allwinner A31 MIPI-DSI controller support") Signed-off-by: Samuel Holland samuel@sholland.org --- drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 22 ++++++++++++++++------ drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 1 + 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 019fdf4ec274..ef35ce5a9bb0 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -804,7 +804,10 @@ static struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = { static enum drm_connector_status sun6i_dsi_connector_detect(struct drm_connector *connector, bool force) { - return connector_status_connected; + struct sun6i_dsi *dsi = connector_to_sun6i_dsi(connector); + + return dsi->panel ? connector_status_connected : + connector_status_disconnected; }

static const struct drm_connector_funcs sun6i_dsi_connector_funcs = { @@ -945,10 +948,15 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host,

if (IS_ERR(panel)) return PTR_ERR(panel); + if (!dsi->drm) + return -EPROBE_DEFER;

dsi->panel = panel; dsi->device = device;

+ drm_panel_attach(dsi->panel, &dsi->connector); + drm_kms_helper_hotplug_event(dsi->drm); + dev_info(host->dev, "Attached device %s\n", device->name);

return 0; @@ -958,10 +966,14 @@ static int sun6i_dsi_detach(struct mipi_dsi_host *host, struct mipi_dsi_device *device) { struct sun6i_dsi *dsi = host_to_sun6i_dsi(host); + struct drm_panel *panel = dsi->panel;

dsi->panel = NULL; dsi->device = NULL;

+ drm_panel_detach(panel); + drm_kms_helper_hotplug_event(dsi->drm); + return 0; }

@@ -1026,9 +1038,6 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master, struct sun6i_dsi *dsi = dev_get_drvdata(dev); int ret;

- if (!dsi->panel) - return -EPROBE_DEFER; - drm_encoder_helper_add(&dsi->encoder, &sun6i_dsi_enc_helper_funcs); ret = drm_encoder_init(drm, @@ -1054,7 +1063,8 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master, }

drm_connector_attach_encoder(&dsi->connector, &dsi->encoder); - drm_panel_attach(dsi->panel, &dsi->connector); + + dsi->drm = drm;

return 0;

@@ -1068,7 +1078,7 @@ static void sun6i_dsi_unbind(struct device *dev, struct device *master, { struct sun6i_dsi *dsi = dev_get_drvdata(dev);

- drm_panel_detach(dsi->panel); + dsi->drm = NULL; }

static const struct component_ops sun6i_dsi_ops = { diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h index 61e88ea6044d..c863900ae3b4 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h @@ -29,6 +29,7 @@ struct sun6i_dsi {

struct device *dev; struct mipi_dsi_device *device; + struct drm_device *drm; struct drm_panel *panel; };

The driver currently uses runtime PM to perform some of the module initialization and cleanup. This has three problems:

1) There is no Kconfig dependency on CONFIG_PM, so if runtime PM is disabled, the driver will not work at all, since the module will never be initialized.

2) The driver does not ensure that the device is suspended when sun6i_dsi_probe() fails or when sun6i_dsi_remove() is called. It simply disables runtime PM. From the docs of pm_runtime_disable():

The device can be either active or suspended after its runtime PM has been disabled.

And indeed, the device will likely still be active if sun6i_dsi_probe fails. For example, if the panel driver is not yet loaded, we have the following sequence:

sun6i_dsi_probe() pm_runtime_enable() mipi_dsi_host_register() of_mipi_dsi_device_add(child) ...device_add()... __device_attach() pm_runtime_get_sync(dev->parent) -> Causes resume bus_for_each_drv() __device_attach_driver() -> No match for panel pm_runtime_put(dev->parent) -> Async idle request component_add() __component_add() try_to_bring_up_masters() try_to_bring_up_master() sun4i_drv_bind() component_bind_all() component_bind() sun6i_dsi_bind() -> Fails with -EPROBE_DEFER mipi_dsi_host_unregister() pm_runtime_disable() __pm_runtime_disable() __pm_runtime_barrier() -> Idle request is still pending cancel_work_sync() -> DSI host is *not* suspended!

Since the device is not suspended, the clock and regulator are never disabled. The imbalance causes a WARN at devres free time.

3) The driver relies on being suspended when sun6i_dsi_encoder_enable() is called. The resume callback has a comment that says:

Some part of it can only be done once we get a number of lanes, see sun6i_dsi_inst_init

And then part of the resume callback only runs if dsi->device is not NULL (that is, if sun6i_dsi_attach() has been called). However, as the above call graph shows, the resume callback is guaranteed to be called before sun6i_dsi_attach(); it is called before child devices get their drivers attached.

Therefore, part of the controller initialization will only run if the device is suspended between the calls to mipi_dsi_host_register() and component_add() (which ends up calling sun6i_dsi_encoder_enable()). Again, as shown by the above call graph, this is not the case. It appears that the controller happens to work because it is still initialized by the bootloader.

Because the connector is hardcoded to always be connected, the device's runtime PM reference is not dropped until system suspend, when sun4i_drv_drm_sys_suspend() ends up calling sun6i_dsi_encoder_disable(). However, that is done as a system sleep PM hook, and at that point the system PM core has already taken another runtime PM reference, so sun6i_dsi_runtime_suspend() is not called. Likewise, by the time the PM core releases its reference, sun4i_drv_drm_sys_resume() has already re-enabled the encoder.

So after system suspend and resume, we have *still never called* sun6i_dsi_inst_init(), and now that the rest of the display pipeline has been reset, the DSI host is unable to communicate with the panel, causing VBLANK timeouts.

Fix all of these issues by inlining the runtime PM hooks into the encoder enable/disable functions, which are guaranteed to run after a panel is attached. This allows sun6i_dsi_inst_init() to be called unconditionally. Furthermore, this causes the hardware to be turned off during system suspend and reinitialized on resume, which was not happening before.

Fixes: 133add5b5ad4 ("drm/sun4i: Add Allwinner A31 MIPI-DSI controller support") Signed-off-by: Samuel Holland samuel@sholland.org --- drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 89 ++++++++------------------ 1 file changed, 26 insertions(+), 63 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index ef35ce5a9bb0..8c2e326d8e16 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -14,7 +14,6 @@ #include <linux/phy/phy-mipi-dphy.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> -#include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> @@ -721,10 +720,31 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder) union phy_configure_opts opts = { 0 }; struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy; u16 delay; + int err;

DRM_DEBUG_DRIVER("Enabling DSI output\n");

- pm_runtime_get_sync(dsi->dev); + err = regulator_enable(dsi->regulator); + if (err) + dev_warn(dsi->dev, "failed to enable VCC-DSI supply: %d\n", err); + + reset_control_deassert(dsi->reset); + clk_prepare_enable(dsi->mod_clk); + + /* + * Enable the DSI block. + */ + regmap_write(dsi->regs, SUN6I_DSI_CTL_REG, SUN6I_DSI_CTL_EN); + + regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG, + SUN6I_DSI_BASIC_CTL0_ECC_EN | SUN6I_DSI_BASIC_CTL0_CRC_EN); + + regmap_write(dsi->regs, SUN6I_DSI_TRANS_START_REG, 10); + regmap_write(dsi->regs, SUN6I_DSI_TRANS_ZERO_REG, 0); + + sun6i_dsi_inst_init(dsi, dsi->device); + + regmap_write(dsi->regs, SUN6I_DSI_DEBUG_DATA_REG, 0xff);

delay = sun6i_dsi_get_video_start_delay(dsi, mode); regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL1_REG, @@ -787,7 +807,9 @@ static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder) phy_power_off(dsi->dphy); phy_exit(dsi->dphy);

- pm_runtime_put(dsi->dev); + clk_disable_unprepare(dsi->mod_clk); + reset_control_assert(dsi->reset); + regulator_disable(dsi->regulator); }

static int sun6i_dsi_get_modes(struct drm_connector *connector) @@ -1147,12 +1169,10 @@ static int sun6i_dsi_probe(struct platform_device *pdev) goto err_unprotect_clk; }

- pm_runtime_enable(dev); - ret = mipi_dsi_host_register(&dsi->host); if (ret) { dev_err(dev, "Couldn't register MIPI-DSI host\n"); - goto err_pm_disable; + goto err_unprotect_clk; }

ret = component_add(&pdev->dev, &sun6i_dsi_ops); @@ -1165,8 +1185,6 @@ static int sun6i_dsi_probe(struct platform_device *pdev)

err_remove_dsi_host: mipi_dsi_host_unregister(&dsi->host); -err_pm_disable: - pm_runtime_disable(dev); err_unprotect_clk: clk_rate_exclusive_put(dsi->mod_clk); return ret; @@ -1179,65 +1197,11 @@ static int sun6i_dsi_remove(struct platform_device *pdev)

component_del(&pdev->dev, &sun6i_dsi_ops); mipi_dsi_host_unregister(&dsi->host); - pm_runtime_disable(dev); clk_rate_exclusive_put(dsi->mod_clk);

return 0; }

-static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev) -{ - struct sun6i_dsi *dsi = dev_get_drvdata(dev); - int err; - - err = regulator_enable(dsi->regulator); - if (err) { - dev_err(dsi->dev, "failed to enable VCC-DSI supply: %d\n", err); - return err; - } - - reset_control_deassert(dsi->reset); - clk_prepare_enable(dsi->mod_clk); - - /* - * Enable the DSI block. - * - * Some part of it can only be done once we get a number of - * lanes, see sun6i_dsi_inst_init - */ - regmap_write(dsi->regs, SUN6I_DSI_CTL_REG, SUN6I_DSI_CTL_EN); - - regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG, - SUN6I_DSI_BASIC_CTL0_ECC_EN | SUN6I_DSI_BASIC_CTL0_CRC_EN); - - regmap_write(dsi->regs, SUN6I_DSI_TRANS_START_REG, 10); - regmap_write(dsi->regs, SUN6I_DSI_TRANS_ZERO_REG, 0); - - if (dsi->device) - sun6i_dsi_inst_init(dsi, dsi->device); - - regmap_write(dsi->regs, SUN6I_DSI_DEBUG_DATA_REG, 0xff); - - return 0; -} - -static int __maybe_unused sun6i_dsi_runtime_suspend(struct device *dev) -{ - struct sun6i_dsi *dsi = dev_get_drvdata(dev); - - clk_disable_unprepare(dsi->mod_clk); - reset_control_assert(dsi->reset); - regulator_disable(dsi->regulator); - - return 0; -} - -static const struct dev_pm_ops sun6i_dsi_pm_ops = { - SET_RUNTIME_PM_OPS(sun6i_dsi_runtime_suspend, - sun6i_dsi_runtime_resume, - NULL) -}; - static const struct of_device_id sun6i_dsi_of_table[] = { { .compatible = "allwinner,sun6i-a31-mipi-dsi" }, { } @@ -1250,7 +1214,6 @@ static struct platform_driver sun6i_dsi_platform_driver = { .driver = { .name = "sun6i-mipi-dsi", .of_match_table = sun6i_dsi_of_table, - .pm = &sun6i_dsi_pm_ops, }, }; module_platform_driver(sun6i_dsi_platform_driver);