From cb6a133bc75bc4c5b25f7c278b6c74bf46a3d71b Mon Sep 17 00:00:00 2001 From: Sean Chang Date: Wed, 19 Aug 2026 23:12:16 +0800 Subject: [PATCH] drm: bridge: dw_hdmi: Fix constant truncation warning on phy_mask In dw_hdmi_probe(), casting the bitwise complement of (HDMI_PHY_HPD | HDMI_PHY_RX_SENSE) directly to u8 triggers a compiler warning (-Wconstant-conversion). Due to C integer promotion rules, the bitwise OR and bitwise NOT are evaluated as 32-bit signed integers, producing 0xFFFFFF0D before being cast down to u8. Fix this by explicitly masking the inverted 32-bit result with 0xFF to keep only the lower byte and prevent implicit upper-bit truncation. Signed-off-by: Sean Chang Reviewed-by: Luca Ceresoli Link: https://patch.msgid.link/20260819151216.56833-1-seanwascoding@gmail.com Signed-off-by: Luca Ceresoli --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 34c5f583e910..937d61c42b58 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -3353,7 +3353,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev, hdmi->channels = 2; hdmi->disabled = true; hdmi->rxsense = true; - hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE); + hdmi->phy_mask = ~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE) & 0xff; hdmi->mc_clkdis = 0x7f; hdmi->last_connector_result = connector_status_disconnected;