[PATCH v12 4/7] drm/meson: gate px_clk when setting rate

[Neil Armstrong]

Disable the px_clk when setting the rate to recover a fully
configured and correctly reset VCLK clock tree after the rate
is set.

Fixes: 77d9e1e6b846 ("drm/meson: add support for MIPI-DSI transceiver")
Signed-off-by: Neil Armstrong <neil.armstr...@linaro.org>
---
 drivers/gpu/drm/meson/meson_dw_mipi_dsi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c 
b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
index a6bc1bdb3d0d..a10cff3ca1fe 100644
--- a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
+++ b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
@@ -95,6 +95,7 @@ static int dw_mipi_dsi_phy_init(void *priv_data)
                return ret;
        }
 
+       clk_disable_unprepare(mipi_dsi->px_clk);
        ret = clk_set_rate(mipi_dsi->px_clk, mipi_dsi->mode->clock * 1000);
 
        if (ret) {
@@ -103,6 +104,12 @@ static int dw_mipi_dsi_phy_init(void *priv_data)
                return ret;
        }
 
+       ret = clk_prepare_enable(mipi_dsi->px_clk);
+       if (ret) {
+               dev_err(mipi_dsi->dev, "Failed to enable DSI Pixel clock (ret 
%d)\n", ret);
+               return ret;
+       }
+
        switch (mipi_dsi->dsi_device->format) {
        case MIPI_DSI_FMT_RGB888:
                dpi_data_format = DPI_COLOR_24BIT;

-- 
2.34.1