[PATCH v12 11/12] drm/mediatek: update DSI sub driver flow for sending commands to panel

YT Shen
2017-01-23T11:05:24Z

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 | 266 ++++++++++++++++++++++---------------
1 file changed, 161 insertions(+), 105 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 85f22d2..aa3541e 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
@@ -239,85 +243,6 @@ static void mtk_dsi_reset_engine(struct mtk_dsi *dsi)
mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);
}

-static int mtk_dsi_poweron(struct mtk_dsi *dsi)
-{
- struct device *dev = dsi->dev;
- int ret;
- u64 pixel_clock, total_bits;
- u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
-
- if (++dsi->refcount != 1)
- return 0;
-
- switch (dsi->format) {
- case MIPI_DSI_FMT_RGB565:
- bit_per_pixel = 16;
- break;
- case MIPI_DSI_FMT_RGB666_PACKED:
- bit_per_pixel = 18;
- break;
- case MIPI_DSI_FMT_RGB666:
- case MIPI_DSI_FMT_RGB888:
- default:
- bit_per_pixel = 24;
- break;
- }
-
- /**
- * vm.pixelclock is in kHz, pixel_clock unit is Hz, so multiply by 1000
- * htotal_time = htotal * byte_per_pixel / num_lanes
- * overhead_time = lpx + hs_prepare + hs_zero + hs_trail + hs_exit
- * mipi_ratio = (htotal_time + overhead_time) / htotal_time
- * data_rate = pixel_clock * bit_per_pixel * mipi_ratio / num_lanes;
- */
- pixel_clock = dsi->vm.pixelclock * 1000;
- htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch +
- dsi->vm.hsync_len;
- htotal_bits = htotal * bit_per_pixel;
-
- overhead_cycles = T_LPX + T_HS_PREP + T_HS_ZERO + T_HS_TRAIL +
- T_HS_EXIT;
- overhead_bits = overhead_cycles * dsi->lanes * 8;
- total_bits = htotal_bits + overhead_bits;
-
- dsi->data_rate = DIV_ROUND_UP_ULL(pixel_clock * total_bits,
- htotal * dsi->lanes);
-
- ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);
- if (ret < 0) {
- dev_err(dev, "Failed to set data rate: %d\n", ret);
- goto err_refcount;
- }
-
- phy_power_on(dsi->phy);
-
- ret = clk_prepare_enable(dsi->engine_clk);
- if (ret < 0) {
- dev_err(dev, "Failed to enable engine clock: %d\n", ret);
- goto err_phy_power_off;
- }
-
- ret = clk_prepare_enable(dsi->digital_clk);
- if (ret < 0) {
- dev_err(dev, "Failed to enable digital clock: %d\n", ret);
- goto err_disable_engine_clk;
- }
-
- mtk_dsi_enable(dsi);
- mtk_dsi_reset_engine(dsi);
- mtk_dsi_phy_timconfig(dsi);
-
- return 0;
-
-err_disable_engine_clk:
- clk_disable_unprepare(dsi->engine_clk);
-err_phy_power_off:
- phy_power_off(dsi->phy);
-err_refcount:
- dsi->refcount--;
- return ret;
-}
-
static void mtk_dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)
{
mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
@@ -365,16 +290,23 @@ 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 +444,16 @@ 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 +512,121 @@ 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 int mtk_dsi_poweron(struct mtk_dsi *dsi)
+{
+ struct device *dev = dsi->dev;
+ int ret;
+ u64 pixel_clock, total_bits;
+ u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
+
+ if (++dsi->refcount != 1)
+ return 0;
+
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB565:
+ bit_per_pixel = 16;
+ break;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ bit_per_pixel = 18;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ case MIPI_DSI_FMT_RGB888:
+ default:
+ bit_per_pixel = 24;
+ break;
+ }
+
+ /**
+ * vm.pixelclock is in kHz, pixel_clock unit is Hz, so multiply by 1000
+ * htotal_time = htotal * byte_per_pixel / num_lanes
+ * overhead_time = lpx + hs_prepare + hs_zero + hs_trail + hs_exit
+ * mipi_ratio = (htotal_time + overhead_time) / htotal_time
+ * data_rate = pixel_clock * bit_per_pixel * mipi_ratio / num_lanes;
+ */
+ pixel_clock = dsi->vm.pixelclock * 1000;
+ htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch +
+ dsi->vm.hsync_len;
+ htotal_bits = htotal * bit_per_pixel;
+
+ overhead_cycles = T_LPX + T_HS_PREP + T_HS_ZERO + T_HS_TRAIL +
+ T_HS_EXIT;
+ overhead_bits = overhead_cycles * dsi->lanes * 8;
+ total_bits = htotal_bits + overhead_bits;
+
+ dsi->data_rate = DIV_ROUND_UP_ULL(pixel_clock * total_bits,
+ htotal * dsi->lanes);
+
+ ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set data rate: %d\n", ret);
+ goto err_refcount;
+ }
+
+ phy_power_on(dsi->phy);
+
+ ret = clk_prepare_enable(dsi->engine_clk);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enable engine clock: %d\n", ret);
+ goto err_phy_power_off;
+ }
+
+ ret = clk_prepare_enable(dsi->digital_clk);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enable digital clock: %d\n", ret);
+ goto err_disable_engine_clk;
+ }
+
+ mtk_dsi_enable(dsi);
+ mtk_dsi_reset_engine(dsi);
+ mtk_dsi_phy_timconfig(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);
+
+ if (dsi->panel) {
+ if (drm_panel_prepare(dsi->panel)) {
+ DRM_ERROR("failed to prepare the panel\n");
+ goto err_disable_digital_clk;
+ }
+ }
+
+ mtk_dsi_set_mode(dsi);
+ mtk_dsi_clk_hs_mode(dsi, 1);
+
+ mtk_dsi_start(dsi);
+
+ return 0;
+err_disable_digital_clk:
+ clk_disable_unprepare(dsi->digital_clk);
+err_disable_engine_clk:
+ clk_disable_unprepare(dsi->engine_clk);
+err_phy_power_off:
+ phy_power_off(dsi->phy);
+err_refcount:
+ dsi->refcount--;
+ return ret;
+}
+
static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
{
if (WARN_ON(dsi->refcount == 0))
@@ -578,6 +635,17 @@ 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);

@@ -596,36 +664,24 @@ 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");
return;
}

- mtk_dsi_rxtx_control(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);
-
- 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_dsi_power_off;
+ }
+ }

dsi->enabled = true;
+
+ return;
+err_dsi_power_off:
+ mtk_dsi_poweroff(dsi);
}

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