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ba2d3e6709
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