diff mbox series

[v8,2/3] drm/mediatek: implement the DSI hs packets aligned

Message ID 20220112153639.12343-3-rex-bc.chen@mediatek.com (mailing list archive)
State New, archived
Headers show
Series force hsa hbp hfp packets multiple of lanenum to avoid screen shift | expand

Commit Message

Rex-BC Chen (陳柏辰) Jan. 12, 2022, 3:36 p.m. UTC 
Some DSI RX devices require the packets on all lanes aligned at the end.
Otherwise, there will be some issues of shift or scroll for screen.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 5d90d2eb0019..2f3ff9b595a4 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -195,6 +195,8 @@  struct mtk_dsi {
 	struct clk *hs_clk;
 
 	u32 data_rate;
+	/* force dsi line end without dsi_null data */
+	bool hs_packet_end_aligned;
 
 	unsigned long mode_flags;
 	enum mipi_dsi_pixel_format format;
@@ -500,6 +502,13 @@  static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
 		DRM_WARN("HFP + HBP less than d-phy, FPS will under 60Hz\n");
 	}
 
+	if (dsi->hs_packet_end_aligned) {
+		horizontal_sync_active_byte = roundup(horizontal_sync_active_byte, dsi->lanes) - 2;
+		horizontal_frontporch_byte = roundup(horizontal_frontporch_byte, dsi->lanes) - 2;
+		horizontal_backporch_byte = roundup(horizontal_backporch_byte, dsi->lanes) - 2;
+		horizontal_backporch_byte -= (vm->hactive * dsi_tmp_buf_bpp + 2) % dsi->lanes;
+	}
+
 	writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
 	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
 	writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
@@ -794,6 +803,7 @@  static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->lanes = device->lanes;
 	dsi->format = device->format;
 	dsi->mode_flags = device->mode_flags;
+	dsi->hs_packet_end_aligned = device->hs_packet_end_aligned;
 
 	return 0;
 }