From: Jiada Wang <jiada_wang@xxxxxxxxxx>
On some monitors, high resolution modes are not working, exhibiting
pixel column truncation problems (for example, 1280x1024 displays as
1280x1022).
The function ipu_di_adjust_videomode() aims to fix these issues by
adjusting a passed videomode to IPU restrictions. The function can
be called from the drm_crtc_helper_funcs->mode_fixup() methods.
Signed-off-by: Jiada Wang <jiada_wang@xxxxxxxxxx>
Signed-off-by: Deepak Das <deepak_das@xxxxxxxxxx>
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
drivers/gpu/ipu-v3/ipu-di.c | 29 +++++++++++++++++++++++++++++
include/video/imx-ipu-v3.h | 2 ++
2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c
index c490ba4..46f9570 100644
--- a/drivers/gpu/ipu-v3/ipu-di.c
+++ b/drivers/gpu/ipu-v3/ipu-di.c
@@ -511,6 +511,35 @@ static void ipu_di_config_clock(struct ipu_di *di,
clk_get_rate(di->clk_di_pixel) / (clkgen0 >> 4));
}
+/*
+ * This function is called to adjust a video mode to IPU restrictions.
+ * It is meant to be called from drm crtc mode_fixup() methods.
+ */
+int ipu_di_adjust_videomode(struct ipu_di *di, struct videomode *mode)
+{
+ u32 diff;
+
+ if (mode->vfront_porch >= 2)
+ return 0;
+
+ diff = 2 - mode->vfront_porch;
+
+ if (mode->vback_porch >= diff) {
+ mode->vfront_porch = 2;
+ mode->vback_porch -= diff;
+ } else if (mode->vsync_len > diff) {
+ mode->vfront_porch = 2;
+ mode->vsync_len = mode->vsync_len - diff;
+ } else {
+ dev_warn(di->ipu->dev, "failed to adjust videomode\n");
+ return -EINVAL;
+ }
+
+ dev_warn(di->ipu->dev, "videomode adapted for IPU restrictions\n");
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipu_di_adjust_videomode);
+
int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig)
{
u32 reg;
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index c74bf4a..d333d54 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -17,6 +17,7 @@
#include <linux/bitmap.h>
#include <linux/fb.h>
#include <media/v4l2-mediabus.h>
+#include <video/videomode.h>
struct ipu_soc;
@@ -236,6 +237,7 @@ void ipu_di_put(struct ipu_di *);
int ipu_di_disable(struct ipu_di *);
int ipu_di_enable(struct ipu_di *);
int ipu_di_get_num(struct ipu_di *);
+int ipu_di_adjust_videomode(struct ipu_di *di, struct videomode *mode);
int ipu_di_init_sync_panel(struct ipu_di *, struct ipu_di_signal_cfg *sig);
/*
--
1.7.9.5
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