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Message-Id: <20230512-amlogic-v6-4-upstream-dsi-ccf-vim3-v6-5-fd2ac9845472@linaro.org>
Date: Fri, 30 Jun 2023 18:29:12 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Jerome Brunet <jbrunet@...libre.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Kevin Hilman <khilman@...libre.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Jagan Teki <jagan@...rulasolutions.com>,
Nicolas Belin <nbelin@...libre.com>
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org,
dri-devel@...ts.freedesktop.org,
Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v6 5/9] 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@...aro.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 57447abf1a29..dc63d2d813a9 100644
--- a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
+++ b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
@@ -94,6 +94,7 @@ 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) {
@@ -102,6 +103,12 @@ static int dw_mipi_dsi_phy_init(void *priv_data)
return 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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