6.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
[ Upstream commit 5c9837374ecf55a1fa3b7622d365a0456960270f ]
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")
Reviewed-by: Nicolas Belin <nbelin@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240403-amlogic-v6-4-upstream-dsi-ccf-vim3-v12-4-99ecdfdc87fc@xxxxxxxxxx
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240403-amlogic-v6-4-upstream-dsi-ccf-vim3-v12-4-99ecdfdc87fc@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 a6bc1bdb3d0d8..a10cff3ca1fef 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;
--
2.43.0
