drm/panel: boe-tv101wum-nl6: Fine tune the panel power sequence

For "boe,tv105wum-nw0" this special panel, it is stipulated in
the panel spec that MIPI needs to keep the LP11 state before
the lcm_reset pin is pulled high.

Signed-off-by: Shuijing Li <shuijing.li@mediatek.com>
Signed-off-by: Xinlei Lee <xinlei.lee@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230515094955.15982-3-shuijing.li@mediatek.com

diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
index a5652d3..64e462f 100644 (file)
--- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
@@ -36,6 +36,7 @@ struct panel_desc {
        const struct panel_init_cmd *init_cmds;
        unsigned int lanes;
        bool discharge_on_disable;
+       bool lp11_before_reset;
 };
 
 struct boe_panel {
@@ -1365,6 +1366,10 @@ static int boe_panel_prepare(struct drm_panel *panel)
 
        usleep_range(10000, 11000);
 
+       if (boe->desc->lp11_before_reset) {
+               mipi_dsi_dcs_nop(boe->dsi);
+               usleep_range(1000, 2000);
+       }
        gpiod_set_value(boe->enable_gpio, 1);
        usleep_range(1000, 2000);
        gpiod_set_value(boe->enable_gpio, 0);
@@ -1591,6 +1596,7 @@ static const struct panel_desc boe_tv105wum_nw0_desc = {
        .mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
                      MIPI_DSI_MODE_LPM,
        .init_cmds = boe_init_cmd,
+       .lp11_before_reset = true,
 };
 
 static const struct drm_display_mode starry_qfh032011_53g_default_mode = {