Hi,
On Sat, Feb 24, 2018 at 10:45:38PM +0100, Jernej Skrabec wrote:
> Current polarity configuration code is cleary wrong since it compares
> same flag two times. However, even if flag name is fixed, it won't work
> well for resolutions which have one polarity positive and another
> negative.
>
> Fix that by properly set each bit according to each polarity. Since
> those two bits are not described in any documentation, relationships
> were obtained by experimentation.
>
> Fixes: b7c7436a5ff0 ("drm/sun4i: Implement A83T HDMI driver")
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxx>
> ---
> drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> index e5bfcdd43ec9..f48e8b70fabe 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> @@ -35,10 +35,11 @@ static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi, void *data,
> struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
> u32 val = 0;
>
> - if ((mode->flags & DRM_MODE_FLAG_NHSYNC) &&
> - (mode->flags & DRM_MODE_FLAG_NHSYNC)) {
> - val = 0x03;
> - }
> + if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> + val |= 0x01;
> +
> + if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> + val |= 0x02;
Can you introduce defines for those?
Thanks!
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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