[PATCHv3 3/8] staging: imx-drm: ipuv3-crtc: don't harcode some mode flags.
Eric Bénard
eric at eukrea.com
Wed Nov 13 02:50:32 EST 2013
Hi Fabio,
Le Wed, 13 Nov 2013 01:52:25 -0200,
Fabio Estevam <festevam at gmail.com> a écrit :
> On Tue, Nov 12, 2013 at 2:49 PM, Denis Carikli <denis at eukrea.com> wrote:
> > + if (mode->flags & DRM_MODE_FLAG_DE_HIGH)
> > + sig_cfg.enable_pol = 1;
> > + if (mode->flags & DRM_MODE_FLAG_PIXDATA_POSEDGE)
> > + sig_cfg.clk_pol = 1;
> >
> > - sig_cfg.enable_pol = 1;
> > - sig_cfg.clk_pol = 1;
>
>
> What are the sig_cfg.enable_pol and sig_cfg.clk_pol values you need
> for your display to operate correctly?
in ipuv3-crtc, line 159 :
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/staging/imx-drm/ipuv3-crtc.c#n159
polarity of the enable signal and the pixel clock are hard coded to 1.
These settings are then used in ipu-di.c to configurer the IPU display
interface :
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/staging/imx-drm/ipu-v3/ipu-di.c#n631
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/staging/imx-drm/ipu-v3/ipu-di.c#n642
This is a problem as the polarity of these signals can vary from one
TFT panel to an other. In our case, we need and active low enable and a
negative edge clock but currently there is no way to configure these
settings in ipuv3-crtc as they are hardcoded to 1 : that's what Denis
is trying to fix.
Eric
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