The OMAP DSI command mode panel driver used to send page & column address before each frame update, and this code was moved into the DSI host driver when converting it to the DRM bridge model.
However, it's not really required to send the page & column address before each frame. It's also something that doesn't really belong to the DSI host driver, so we should drop the code.
That said, frame updates break if we don't send _something_ between the frames. A NOP command does the trick.
It is not clear if this behavior is as expected from a DSI command mode frame transfer, or is it a feature/issue with OMAP DSI driver, or a feature/issue in the command mode panel used.
Most likely this is related to the following from the DSI spec:
"To enable PHY synchronization the host processor should periodically end HS transmission and drive the Data Lanes to the LP state. This transition should take place at least once per frame."
Signed-off-by: Tomi Valkeinen tomi.valkeinen@ti.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Sebastian Reichel sebastian.reichel@collabora.com --- drivers/gpu/drm/omapdrm/dss/dsi.c | 46 ++++++++++++------------------- 1 file changed, 17 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c index c5682b2e26eb..e24db2431fb8 100644 --- a/drivers/gpu/drm/omapdrm/dss/dsi.c +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c @@ -3881,35 +3881,19 @@ static int _dsi_update(struct dsi_data *dsi) return 0; }
-static int _dsi_update_window(struct dsi_data *dsi, int channel, - int x, int y, int w, int h) -{ - int x1 = x, x2 = (x + w - 1); - int y1 = y, y2 = (y + h - 1); - u8 payloadX[5] = { MIPI_DCS_SET_COLUMN_ADDRESS, - x1 >> 8, x1 & 0xff, x2 >> 8, x2 & 0xff }; - u8 payloadY[5] = { MIPI_DCS_SET_PAGE_ADDRESS, - y1 >> 8, y1 & 0xff, y2 >> 8, y2 & 0xff }; - struct mipi_dsi_msg msgX = { 0 }, msgY = { 0 }; - int ret; +static int _dsi_send_nop(struct dsi_data *dsi, int channel) +{ + const u8 payload[] = { MIPI_DCS_NOP }; + const struct mipi_dsi_msg msg = { + .channel = channel, + .type = MIPI_DSI_DCS_SHORT_WRITE, + .tx_len = 1, + .tx_buf = payload, + };
WARN_ON(!dsi_bus_is_locked(dsi));
- msgX.type = MIPI_DSI_DCS_LONG_WRITE; - msgX.channel = channel; - msgX.tx_buf = payloadX; - msgX.tx_len = sizeof(payloadX); - - msgY.type = MIPI_DSI_DCS_LONG_WRITE; - msgY.channel = channel; - msgY.tx_buf = payloadY; - msgY.tx_len = sizeof(payloadY); - - ret = _omap_dsi_host_transfer(dsi, &msgX); - if (ret != 0) - return ret; - - return _omap_dsi_host_transfer(dsi, &msgY); + return _omap_dsi_host_transfer(dsi, &msg); }
static int dsi_update_channel(struct omap_dss_device *dssdev, int channel) @@ -3941,10 +3925,14 @@ static int dsi_update_channel(struct omap_dss_device *dssdev, int channel)
dsi_set_ulps_auto(dsi, false);
- r = _dsi_update_window(dsi, channel, 0, 0, dsi->vm.hactive, - dsi->vm.vactive); + /* + * Send NOP between the frames. If we don't send something here, the + * updates stop working. This is probably related to DSI spec stating + * that the DSI host should transition to LP at least once per frame. + */ + r = _dsi_send_nop(dsi, channel); if (r < 0) { - DSSWARN("window update error: %d\n", r); + DSSWARN("failed to send nop between frames: %d\n", r); goto err; }