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Commit 6541d710 authored by Jiada Wang's avatar Jiada Wang Committed by Philipp Zabel
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gpu: ipu-di: Add ipu_di_adjust_videomode() 



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: default avatarJiada Wang <jiada_wang@mentor.com>
Signed-off-by: default avatarDeepak Das <deepak_das@mentor.com>
Signed-off-by: default avatarSteve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent f66a1627

drivers/gpu/ipu-v3/ipu-di.c

+29 −0
Original line number Diff line number Diff line
@@ -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;

include/video/imx-ipu-v3.h

+2 −0
Original line number Diff line number Diff line
@@ -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);



/*