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Subject[PATCH v2 01/12] drm/sun4i: sun6i_mipi_dsi: Compute burst mode loop N1 instruction delay
Date
Loop N1 instruction delay for burst mode lcd panel are
computed as per BSP code.

Reference code is available in BSP (from linux-sunxi
drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)

dsi_dev[sel]->dsi_inst_loop_num.bits.loop_n1=
(panel->lcd_ht-panel->lcd_x)*(150)/(panel->lcd_dclk_freq*8) - 50;
=> (((mode->htotal - mode->hdisplay) * 150) /
((mode->clock / 1000) * 8)) - 50;

So use the similar computation for loop N1 delay.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index def145086a5c..43ab7127d428 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -379,6 +379,24 @@ static u16 sun6i_dsi_get_timings_vblk(struct sun6i_dsi *dsi,
return vblk;
}

+static u16 sun6i_dsi_setup_inst_delay(struct sun6i_dsi *dsi,
+ struct drm_display_mode *mode)
+{
+ struct mipi_dsi_device *device = dsi->device;
+ u32 hsync_porch, dclk;
+ u16 delay;
+
+ hsync_porch = (mode->htotal - mode->hdisplay);
+ dclk = (mode->clock / 1000);
+
+ if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+ delay = ((hsync_porch * 150) / (dclk * 8)) - 50;
+ else
+ delay = 50 - 1;
+
+ return delay;
+}
+
static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
@@ -418,7 +436,7 @@ static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
- u16 delay = 50 - 1;
+ u16 delay = sun6i_dsi_setup_inst_delay(dsi, mode);

regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
--
2.18.0.321.gffc6fa0e3
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