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| author | Jiada Wang <jiada_wang@mentor.com> | 2014-12-19 05:00:20 +0300 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2015-01-07 21:12:07 +0300 |
| commit | 6541d71082fdb91f862c92920c6530e4e0548d6f (patch) | |
| tree | 254653c61e3d12abc3aed43f89afbfe56851759b /drivers/gpu/ipu-v3/ipu-di.c | |
| parent | f66a162751b90ce684dc55eb3e660e30f7554de3 (diff) | |
| download | linux-6541d71082fdb91f862c92920c6530e4e0548d6f.tar.xz | |
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: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Deepak Das <deepak_das@mentor.com>
Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/gpu/ipu-v3/ipu-di.c')
| -rw-r--r-- | drivers/gpu/ipu-v3/ipu-di.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c index c490ba4384fc..46f9570a8b59 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; |