Simplify hx8394_enable() function by using hx8394_disable() instead of
open-coding it and mipi_dsi_msleep() instead of manual checks.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-himax-hx8394.c | 41 ++++++++++--------------------
 1 file changed, 14 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-himax-hx8394.c b/drivers/gpu/drm/panel/panel-himax-hx8394.c
index d64f3521eb15..1f23c50b6661 100644
--- a/drivers/gpu/drm/panel/panel-himax-hx8394.c
+++ b/drivers/gpu/drm/panel/panel-himax-hx8394.c
@@ -618,47 +618,34 @@ static const struct hx8394_panel_desc hl055fhav028c_desc = {
 	.init_sequence = hl055fhav028c_init_sequence,
 };
 
-static int hx8394_enable(struct drm_panel *panel)
+static int hx8394_disable(struct drm_panel *panel)
 {
 	struct hx8394 *ctx = panel_to_hx8394(panel);
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
-	int ret;
-
-	ctx->desc->init_sequence(&dsi_ctx);
-
-	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
-
-	if (dsi_ctx.accum_err)
-		return dsi_ctx.accum_err;
-	/* Panel is operational 120 msec after reset */
-	msleep(120);
-
-	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
-	if (dsi_ctx.accum_err)
-		goto sleep_in;
-
-	return 0;
-
-sleep_in:
-	ret = dsi_ctx.accum_err;
-	dsi_ctx.accum_err = 0;
 
-	/* This will probably fail, but let's try orderly power off anyway. */
 	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
-	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_msleep(&dsi_ctx, 50); /* about 3 frames */
 
-	return ret;
+	return dsi_ctx.accum_err;
 }
 
-static int hx8394_disable(struct drm_panel *panel)
+static int hx8394_enable(struct drm_panel *panel)
 {
 	struct hx8394 *ctx = panel_to_hx8394(panel);
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
 
-	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
-	mipi_dsi_msleep(&dsi_ctx, 50); /* about 3 frames */
+	ctx->desc->init_sequence(&dsi_ctx);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	/* Panel is operational 120 msec after reset */
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	if (dsi_ctx.accum_err)
+		hx8394_disable(panel);
 
 	return dsi_ctx.accum_err;
 }

-- 
2.47.3