From ba2d3e6709681b6c16ba8d65a23d72c706d82b5c Mon Sep 17 00:00:00 2001
From: Sui Jingfeng <sui.jingfeng@linux.dev>
Date: Sun, 17 Mar 2024 00:05:36 +0800
Subject: [PATCH] drm/bridge: ite66121: Register HPD interrupt handler only
when 'client->irq > 0'
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>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240316160536.1051513-1-sui.jingfeng@linux.dev
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240316160536.1051513-1-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 1c3433b5e3664..0528840586448 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);
--
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