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    Subject[PATCH v12 4/7] drm/meson: gate px_clk when setting rate
    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.armstrong@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


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