[PATCH v2 2/4] drm: renesas: rzg2l_mipi_dsi: Fix assert of CMN_RSTB signal

[Biju <biju.das.au@gmail.com>]

From: Biju Das <biju.das.jz@bp.renesas.com>

The CMN_RSTB reset signal is not required for reading PHY registers in the
probe. Move reset_control_assert() from rzg2l_mipi_dsi_dphy_exit() to
rzg2l_mipi_dsi_stop(), placing it before the dphy_exit() call. Since this
reset signal is optional for RZ/V2H, the call is a no-op on that SoC.

Fixes: 2991c3f0ca86 ("drm: renesas: rz-du: mipi_dsi: Add OF data support")
Fixes: 418bb3a69e13 ("drm: rcar-du: rzg2l_mipi_dsi: Enhance device lanes check")
Cc: stable@vger.kernel.org
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v2:
 * New patch
---
 drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
index ff95cb9a7de5..d2da247abf05 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
@@ -541,8 +541,6 @@ static void rzg2l_mipi_dsi_dphy_exit(struct rzg2l_mipi_dsi *dsi)
 
 	dphyctrl0 &= ~(DSIDPHYCTRL0_EN_LDO1200 | DSIDPHYCTRL0_EN_BGR);
 	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYCTRL0, dphyctrl0);
-
-	reset_control_assert(dsi->rstc);
 }
 
 static int rzg2l_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_freq,
@@ -822,6 +820,7 @@ static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi,
 
 static void rzg2l_mipi_dsi_stop(struct rzg2l_mipi_dsi *dsi)
 {
+	reset_control_assert(dsi->rstc);
 	dsi->info->dphy_exit(dsi);
 	pm_runtime_put(dsi->dev);
 }
-- 
2.43.0