* [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0'
@ 2024-03-16 16:05 Sui Jingfeng
2024-03-16 17:43 ` Dmitry Baryshkov
2024-03-18 15:22 ` Neil Armstrong
0 siblings, 2 replies; 3+ messages in thread
From: Sui Jingfeng @ 2024-03-16 16:05 UTC (permalink / raw
To: Phong LE
Cc: Neil Armstrong, Andrzej Hajda, Robert Foss, Laurent Pinchart,
Jonas Karlman, Jernej Skrabec, Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Daniel Vetter, dri-devel,
linux-kernel, Sui Jingfeng
If a specific design doesn't wire IT66121's interrupt signal output pin up
to the display controller side, then we should not register the interrupt
handler. Such a decision is valid usage, as we can fall back to polling
mode. So, don't make the assumption that a specific board always supports
HPD. Carry out a sanity check on 'client->irq' before using it, fall back
to polling mode if client->irq < 0 is true. Such a design increases the
overall flexibility.
Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
---
drivers/gpu/drm/bridge/ite-it66121.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 1c3433b5e366..052884058644 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -1586,13 +1586,18 @@ static int it66121_probe(struct i2c_client *client)
ctx->bridge.funcs = &it66121_bridge_funcs;
ctx->bridge.of_node = dev->of_node;
ctx->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
- ctx->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
-
- ret = devm_request_threaded_irq(dev, client->irq, NULL, it66121_irq_threaded_handler,
- IRQF_ONESHOT, dev_name(dev), ctx);
- if (ret < 0) {
- dev_err(dev, "Failed to request irq %d:%d\n", client->irq, ret);
- return ret;
+ ctx->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
+ if (client->irq > 0) {
+ ctx->bridge.ops |= DRM_BRIDGE_OP_HPD;
+
+ ret = devm_request_threaded_irq(dev, client->irq, NULL,
+ it66121_irq_threaded_handler,
+ IRQF_ONESHOT, dev_name(dev),
+ ctx);
+ if (ret < 0) {
+ dev_err(dev, "Failed to request irq %d:%d\n", client->irq, ret);
+ return ret;
+ }
}
it66121_audio_codec_init(ctx, dev);
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0'
2024-03-16 16:05 [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0' Sui Jingfeng
@ 2024-03-16 17:43 ` Dmitry Baryshkov
2024-03-18 15:22 ` Neil Armstrong
1 sibling, 0 replies; 3+ messages in thread
From: Dmitry Baryshkov @ 2024-03-16 17:43 UTC (permalink / raw
To: Sui Jingfeng
Cc: Phong LE, Neil Armstrong, Andrzej Hajda, Robert Foss,
Laurent Pinchart, Jonas Karlman, Jernej Skrabec,
Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, David Airlie,
Daniel Vetter, dri-devel, linux-kernel
On Sat, 16 Mar 2024 at 18:05, Sui Jingfeng <sui.jingfeng@linux.dev> wrote:
>
> If a specific design doesn't wire IT66121's interrupt signal output pin up
> to the display controller side, then we should not register the interrupt
> handler. Such a decision is valid usage, as we can fall back to polling
> mode. So, don't make the assumption that a specific board always supports
> HPD. Carry out a sanity check on 'client->irq' before using it, fall back
> to polling mode if client->irq < 0 is true. Such a design increases the
> overall flexibility.
>
> Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
> ---
> drivers/gpu/drm/bridge/ite-it66121.c | 19 ++++++++++++-------
> 1 file changed, 12 insertions(+), 7 deletions(-)
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
--
With best wishes
Dmitry
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0'
2024-03-16 16:05 [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0' Sui Jingfeng
2024-03-16 17:43 ` Dmitry Baryshkov
@ 2024-03-18 15:22 ` Neil Armstrong
1 sibling, 0 replies; 3+ messages in thread
From: Neil Armstrong @ 2024-03-18 15:22 UTC (permalink / raw
To: Phong LE, Sui Jingfeng
Cc: Andrzej Hajda, Robert Foss, Laurent Pinchart, Jonas Karlman,
Jernej Skrabec, Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Daniel Vetter, dri-devel,
linux-kernel
Hi,
On Sun, 17 Mar 2024 00:05:36 +0800, Sui Jingfeng wrote:
> If a specific design doesn't wire IT66121's interrupt signal output pin up
> to the display controller side, then we should not register the interrupt
> handler. Such a decision is valid usage, as we can fall back to polling
> mode. So, don't make the assumption that a specific board always supports
> HPD. Carry out a sanity check on 'client->irq' before using it, fall back
> to polling mode if client->irq < 0 is true. Such a design increases the
> overall flexibility.
>
> [...]
Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-next)
[1/1] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0'
https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/ba2d3e6709681b6c16ba8d65a23d72c706d82b5c
--
Neil
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-03-16 16:05 [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only when 'client->irq > 0' Sui Jingfeng
2024-03-16 17:43 ` Dmitry Baryshkov
2024-03-18 15:22 ` Neil Armstrong
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