[PATCH v11 11/12] drm/mediatek: update DSI sub driver flow for sending commands to panel

YT Shen
2017-01-11T06:54:23Z

This patch update enable/disable flow of DSI module.
Original flow works on there is a bridge chip: DSI -> bridge -> panel.
In this case: DSI -> panel, the DSI sub driver flow should be updated.
We need to initialize DSI first so that we can send commands to panel.

Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>
Signed-off-by: YT Shen <yt.shen@mediatek.com>
---
drivers/gpu/drm/mediatek/mtk_dsi.c | 89 +++++++++++++++++++++++++++++++-------
1 file changed, 74 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 85f22d2..21392c4 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -126,6 +126,10 @@
#define CLK_HS_POST (0xff << 8)
#define CLK_HS_EXIT (0xff << 16)

+#define DSI_VM_CMD_CON 0x130
+#define VM_CMD_EN BIT(0)
+#define TS_VFP_EN BIT(5)
+
#define DSI_CMDQ0 0x180
#define CONFIG (0xff << 0)
#define SHORT_PACKET 0
@@ -365,16 +369,23 @@ static void mtk_dsi_set_mode(struct mtk_dsi *dsi)
u32 vid_mode = CMD_MODE;

if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
- vid_mode = SYNC_PULSE_MODE;
-
- if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&
- !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
+ if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
vid_mode = BURST_MODE;
+ else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
+ vid_mode = SYNC_PULSE_MODE;
+ else
+ vid_mode = SYNC_EVENT_MODE;
}

writel(vid_mode, dsi->regs + DSI_MODE_CTRL);
}

+static void mtk_dsi_set_vm_cmd(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_VM_CMD_CON, VM_CMD_EN, VM_CMD_EN);
+ mtk_dsi_mask(dsi, DSI_VM_CMD_CON, TS_VFP_EN, TS_VFP_EN);
+}
+
static void mtk_dsi_ps_control_vact(struct mtk_dsi *dsi)
{
struct videomode *vm = &dsi->vm;
@@ -512,6 +523,16 @@ static void mtk_dsi_start(struct mtk_dsi *dsi)
writel(1, dsi->regs + DSI_START);
}

+static void mtk_dsi_stop(struct mtk_dsi *dsi)
+{
+ writel(0, dsi->regs + DSI_START);
+}
+
+static void mtk_dsi_set_cmd_mode(struct mtk_dsi *dsi)
+{
+ writel(CMD_MODE, dsi->regs + DSI_MODE_CTRL);
+}
+
static void mtk_dsi_set_interrupt_enable(struct mtk_dsi *dsi)
{
u32 inten = LPRX_RD_RDY_INT_FLAG | CMD_DONE_INT_FLAG | VM_DONE_INT_FLAG;
@@ -570,6 +591,19 @@ static irqreturn_t mtk_dsi_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static s32 mtk_dsi_switch_to_cmd_mode(struct mtk_dsi *dsi, u8 irq_flag, u32 t)
+{
+ mtk_dsi_irq_data_clear(dsi, irq_flag);
+ mtk_dsi_set_cmd_mode(dsi);
+
+ if (!mtk_dsi_wait_for_irq_done(dsi, irq_flag, t)) {
+ DRM_ERROR("failed to switch cmd mode\n");
+ return -ETIME;
+ } else {
+ return 0;
+ }
+}
+
static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
{
if (WARN_ON(dsi->refcount == 0))
@@ -578,6 +612,17 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
if (--dsi->refcount != 0)
return;

+ mtk_dsi_stop(dsi);
+ if (!mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) {
+ if (dsi->panel) {
+ if (drm_panel_unprepare(dsi->panel)) {
+ DRM_ERROR("failed to unprepare the panel\n");
+ return;
+ }
+ }
+ }
+
+ mtk_dsi_reset_engine(dsi);
mtk_dsi_lane0_ulp_mode_enter(dsi);
mtk_dsi_clk_ulp_mode_enter(dsi);

@@ -596,13 +641,6 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
if (dsi->enabled)
return;

- if (dsi->panel) {
- if (drm_panel_prepare(dsi->panel)) {
- DRM_ERROR("failed to setup the panel\n");
- return;
- }
- }
-
ret = mtk_dsi_poweron(dsi);
if (ret < 0) {
DRM_ERROR("failed to power on dsi\n");
@@ -610,22 +648,43 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
}

mtk_dsi_rxtx_control(dsi);
+ mtk_dsi_ps_control_vact(dsi);
+ mtk_dsi_set_vm_cmd(dsi);
+ mtk_dsi_config_vdo_timing(dsi);
+ mtk_dsi_set_interrupt_enable(dsi);

mtk_dsi_clk_ulp_mode_leave(dsi);
mtk_dsi_lane0_ulp_mode_leave(dsi);
mtk_dsi_clk_hs_mode(dsi, 0);
- mtk_dsi_set_mode(dsi);

- mtk_dsi_ps_control_vact(dsi);
- mtk_dsi_config_vdo_timing(dsi);
- mtk_dsi_set_interrupt_enable(dsi);
+ if (dsi->panel) {
+ if (drm_panel_prepare(dsi->panel)) {
+ DRM_ERROR("failed to prepare the panel\n");
+ goto err_dsi_power_off;
+ }
+ }

mtk_dsi_set_mode(dsi);
mtk_dsi_clk_hs_mode(dsi, 1);

mtk_dsi_start(dsi);

+ if (dsi->panel) {
+ if (drm_panel_enable(dsi->panel)) {
+ DRM_ERROR("failed to enable the panel\n");
+ goto err_panel_disable;
+ }
+ }
+
dsi->enabled = true;
+
+ return;
+err_panel_disable:
+ mtk_dsi_stop(dsi);
+ if (dsi->panel)
+ drm_panel_unprepare(dsi->panel);
+err_dsi_power_off:
+ mtk_dsi_poweroff(dsi);
}

static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
--
1.9.1