From 0e8e5229e7e3d316fc5c35a9dd04ce5fd953cda8 Mon Sep 17 00:00:00 2001
From: Sandor Yu <Sandor.yu@nxp.com>
Date: Mon, 10 Sep 2018 15:40:57 +0800
Subject: [PATCH] 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>
---
drivers/gpu/drm/imx/hdp/imx-hdp.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/imx/hdp/imx-hdp.c b/drivers/gpu/drm/imx/hdp/imx-hdp.c
index fa065ceec4949c..da4079f7e920c9 100644
--- a/drivers/gpu/drm/imx/hdp/imx-hdp.c
+++ b/drivers/gpu/drm/imx/hdp/imx-hdp.c
@@ -819,11 +819,14 @@ 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 */
--
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