From 8b00951402f7420365b5697269b190f616bd116a Mon Sep 17 00:00:00 2001 From: AngeloGioacchino Del Regno Date: Thu, 8 Jan 2026 11:19:59 +0100 Subject: [PATCH] drm/mediatek: mtk_dsi: Add support for High Speed (HS) mode Up until now, the MediaTek DSI Controller has always been working in Low Power Mode (LPM), as this driver has always ignored the MIPI_DSI_MSG_USE_LPM flag hence never setting HS mode. In the current state of the driver the only thing that is needed to add support for DSI High Speed (HS) transmit is to simply set the "HSTX" config bit in the configuration register. Check if flag MIPI_DSI_MSG_USE_LPM is set and, if not, set HSTX. Signed-off-by: AngeloGioacchino Del Regno Tested-by: Gary Bisson Reviewed-by: CK Hu Link: https://patchwork.kernel.org/project/dri-devel/patch/20260108101959.14872-1-angelogioacchino.delregno@collabora.com/ Signed-off-by: Chun-Kuang Hu --- drivers/gpu/drm/mediatek/mtk_dsi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 0e2bcd5f67b76..cad7d1e264183 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -152,6 +152,7 @@ #define SHORT_PACKET 0 #define LONG_PACKET 2 #define BTA BIT(2) +#define HSTX BIT(3) #define DATA_ID GENMASK(15, 8) #define DATA_0 GENMASK(23, 16) #define DATA_1 GENMASK(31, 24) @@ -1080,6 +1081,9 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg) else config = (msg->tx_len > 2) ? LONG_PACKET : SHORT_PACKET; + if (!(msg->flags & MIPI_DSI_MSG_USE_LPM)) + config |= HSTX; + if (msg->tx_len > 2) { cmdq_size = 1 + (msg->tx_len + 3) / 4; cmdq_off = 4; -- 2.47.3