MLK-19496-3: HDP: max pixel clock support rate 297MHz for no edid case

Generally DDC function is not work with no edid.
Add max pixel clock support rate 297MHz for no edid case.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>

diff --git a/drivers/gpu/drm/imx/hdp/imx-hdp.c b/drivers/gpu/drm/imx/hdp/imx-hdp.c
index 4852dfa..26d0bd8 100644 (file)
--- a/drivers/gpu/drm/imx/hdp/imx-hdp.c
+++ b/drivers/gpu/drm/imx/hdp/imx-hdp.c
@@ -817,11 +817,14 @@ imx_hdp_connector_mode_valid(struct drm_connector *connector,
 
        cmdline_mode = &connector->cmdline_mode;
 
-       /* cmdline mode is the max support video mode when edid disabled */
+       /* cmdline mode is the max support video mode when edid disabled
+        * Add max support pixel rate to 297MHz in case no DDC function with no EDID */
        if (hdp->no_edid) {
                if (cmdline_mode->xres != 0 &&
                        cmdline_mode->xres < mode->hdisplay)
                        return MODE_BAD_HVALUE;
+               if (mode->clock > 297000)
+                       return MODE_CLOCK_HIGH;
        }
 
        /* For iMX8QM A0 Max support video mode is 4kp30 */