[PATCH v8 09/12] drm/meson: gate px_clk when setting rate

Neil Armstrong
2023-11-09T09:00:29Z

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 e5fe4e994f43..72abe2057ec3 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