Allwinner MIPI DSI DRQ set value can be varied with respective
video modes.
- burst mode the set value is always 0
- video modes whose front porch greater than 20, the set value
can be computed based front porch and bpp.
- video modes whose front porch is not greater than 20, the set value
is simply 0
This patch simplifies existing drq set value code by grouping
into sun6i_dsi_get_drq and support all video modes.
Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
---
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 38 ++++++++++++++++----------
1 file changed, 23 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index efd08bfd0cb8..d60955880c43 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -363,6 +363,26 @@ static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi,
SUN6I_DSI_INST_JUMP_CFG_NUM(1));
};
+static int sun6i_dsi_get_drq(struct sun6i_dsi *dsi,
+ struct drm_display_mode *mode)
+{
+ struct mipi_dsi_device *device = dsi->device;
+ int drq = 0;
+
+ if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+ return drq;
+
+ if ((mode->hsync_start - mode->hdisplay) > 20) {
+ /* Maaaaaagic */
+ u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
+
+ drq *= mipi_dsi_pixel_format_to_bpp(device->format);
+ drq /= 32;
+ }
+
+ return drq;
+}
+
static u16 sun6i_dsi_get_timings_vblk(struct sun6i_dsi *dsi,
struct drm_display_mode *mode, u16 hblk)
{
@@ -478,21 +498,9 @@ static u16 sun6i_dsi_get_video_start_delay(struct
sun6i_dsi *dsi,
static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
- struct mipi_dsi_device *device = dsi->device;
- u32 val = 0;
-
- if ((mode->hsync_start - mode->hdisplay) > 20) {
- /* Maaaaaagic */
- u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
-
- drq *= mipi_dsi_pixel_format_to_bpp(device->format);
- drq /= 32;
-
- val = (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
- SUN6I_DSI_TCON_DRQ_SET(drq));
- }
-
- regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG, val);
+ regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG,
+ SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
+ SUN6I_DSI_TCON_DRQ_SET(sun6i_dsi_get_drq(dsi, mode)));
}
static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
--
2.18.0.321.gffc6fa0e3
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