Re: [PATCH] drm/mediatek: mtk_dsi: Add support for High Speed (HS) mode
From: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Date: 2026-01-16 23:51:47
Also in:
dri-devel, linux-mediatek, lkml
Hi, Angelo: AngeloGioacchino Del Regno [off-list ref] 於 2026年1月8日週四 上午10:20寫道：
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.
Applied to mediatek-drm-next [1], thanks. [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next Regards, Chun-Kuang.
quoted hunk ↗ jump to hunk
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> --- 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 e4953d5cb6a8..a90cae9512c5 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c@@ -155,6 +155,7 @@ #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)@@ -1177,6 +1178,9 @@ 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; --2.52.0