On Sun, Jan 29, 2017 at 01:24:32PM +0000, John Keeping wrote:
Panel drivers may want to sent commands during the disable function, for example MIPI_DCS_SET_DISPLAY_OFF before the video signal ends. In order to send commands we need to write to registers, so pclk must be enabled.
While changing this, remove the unnecessary code after the panel unprepare call which seems to be a workaround for a specific panel and thus belongs in the panel driver.
Do you know which panel? If the panel driver is upstream, we should make sure we migrate this hack before removing it here. If it's downstream somewhere,
Reviewed-by: Sean Paul seanpaul@chromium.org
Signed-off-by: John Keeping john@metanate.com Reviewed-by: Chris Zhong zyw@rock-chips.com
v3:
- Add Chris' Reviewed-by
Unchanged in v2
drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c index 7ada6d8ed143..290282e86d16 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c @@ -846,24 +846,16 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder) { struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
- drm_panel_disable(dsi->panel);
- if (clk_prepare_enable(dsi->pclk)) { dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__); return; }
- drm_panel_disable(dsi->panel);
- dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE); drm_panel_unprepare(dsi->panel);
dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
/*
* This is necessary to make sure the peripheral will be driven* normally when the display is enabled again later.*/msleep(120);
dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE); dw_mipi_dsi_disable(dsi); clk_disable_unprepare(dsi->pclk);
}
2.11.0.197.gb556de5.dirty
dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel