If dc is about to work in one-shot mode, we need to set dc's scan
mode to NC(Non-contiguous).
There are 2 things which can make dc send frame again:
- TE signal is received
- Driver sets the NC_HOST_TRIG_ENABLE
Signed-off-by: Mark Zhang <markz@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/dc.c | 33 +++++++++++++++++++++++++++------
drivers/gpu/drm/tegra/dc.h | 5 +++++
2 files changed, 32 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index a287e4fec865..2fdbed9b2b04 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -18,6 +18,7 @@
#include "drm.h"
#include "gem.h"
+#include <drm/drm_panel.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_plane_helper.h>
@@ -1248,10 +1249,26 @@ static void tegra_crtc_mode_set_nofb(struct drm_crtc *crtc)
tegra_dc_writel(dc, value, DC_DISP_INTERLACE_CONTROL);
}
- value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
- value &= ~DISP_CTRL_MODE_MASK;
- value |= DISP_CTRL_MODE_C_DISPLAY;
- tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
+ if (mode->private_flags & DRM_PANEL_FLAG_PREFER_ONE_SHOT) {
+ /* enable MSF & set MSF polarity */
+ value = MSF_ENABLE | MSF_LSPI;
+ if (mode->private_flags & DRM_PANEL_FLAG_TE_POLARITY_HIGH)
+ value |= MSF_POLARITY_HIGH;
+ else
+ value |= MSF_POLARITY_LOW;
+ tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND_OPTION0);
+
+ /* set non-continuous mode */
+ value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
+ value &= ~DISP_CTRL_MODE_MASK;
+ value |= DISP_CTRL_MODE_NC_DISPLAY;
+ tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
+ } else {
+ value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
+ value &= ~DISP_CTRL_MODE_MASK;
+ value |= DISP_CTRL_MODE_C_DISPLAY;
+ tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
+ }
value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
value |= PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
@@ -1339,6 +1356,9 @@ static irqreturn_t tegra_dc_irq(int irq, void *data)
*/
}
+ if (status & MSF_INT)
+ dev_dbg(dc->dev, "MSF_INT received.\n");
+
return IRQ_HANDLED;
}
@@ -1732,10 +1752,11 @@ static int tegra_dc_init(struct host1x_client *client)
WINDOW_B_THRESHOLD(1) | WINDOW_C_THRESHOLD(1);
tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY_TIMER);
- value = VBLANK_INT | WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT;
+ value = VBLANK_INT | WIN_A_UF_INT | WIN_B_UF_INT |
+ WIN_C_UF_INT | MSF_INT;
tegra_dc_writel(dc, value, DC_CMD_INT_ENABLE);
- value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT;
+ value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT | MSF_INT;
tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
if (dc->soc->supports_border_color)
diff --git a/drivers/gpu/drm/tegra/dc.h b/drivers/gpu/drm/tegra/dc.h
index 55792daabbb5..4a2d0fec5853 100644
--- a/drivers/gpu/drm/tegra/dc.h
+++ b/drivers/gpu/drm/tegra/dc.h
@@ -27,6 +27,10 @@
#define DC_CMD_CONT_SYNCPT_VSYNC 0x028
#define SYNCPT_VSYNC_ENABLE (1 << 8)
#define DC_CMD_DISPLAY_COMMAND_OPTION0 0x031
+#define MSF_ENABLE (1 << 1)
+#define MSF_LSPI (0 << 2)
+#define MSF_POLARITY_HIGH (0 << 0)
+#define MSF_POLARITY_LOW (1 << 0)
#define DC_CMD_DISPLAY_COMMAND 0x032
#define DISP_CTRL_MODE_STOP (0 << 5)
#define DISP_CTRL_MODE_C_DISPLAY (1 << 5)
@@ -53,6 +57,7 @@
#define WIN_A_UF_INT (1 << 8)
#define WIN_B_UF_INT (1 << 9)
#define WIN_C_UF_INT (1 << 10)
+#define MSF_INT (1 << 12)
#define WIN_A_OF_INT (1 << 14)
#define WIN_B_OF_INT (1 << 15)
#define WIN_C_OF_INT (1 << 16)
--
1.7.9.5
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