From: Neil Armstrong neil.armstrong@linaro.org
stable inclusion from stable-v6.6.33 commit 900d54bced612e407bee4964703960c9ab693fc4 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
[ 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@baylibre.com Link: https://lore.kernel.org/r/20240403-amlogic-v6-4-upstream-dsi-ccf-vim3-v12-4-... Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20240403-amlogic-v6-4-upstream... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wang Hai wanghai38@huawei.com --- 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;