Hi Thierry,
On Wednesday 04 December 2013 11:01:07 Thierry Reding wrote:
On Wed, Dec 04, 2013 at 02:38:21AM +0100, Laurent Pinchart wrote:
On Tuesday 03 December 2013 10:59:24 Thierry Reding wrote:
On Mon, Dec 02, 2013 at 01:52:20AM +0100, Laurent Pinchart wrote: [...]
diff --git a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
[...]
@@ -170,7 +178,9 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
return;/* Enable clocks before accessing the hardware. */
- shmob_drm_clk_on(sdev);
- ret = shmob_drm_clk_on(sdev);
- if (ret < 0)
return;Perhaps this should be printing an error or using WARN_ON()? Otherwise it might be very difficult to diagnose what's going wrong.
That's a good point. In practice, as the driver always uses a Renesas SoC MSTP clock, the clock code will print a message to the kernel log though, so I'm not sure whether we should duplicate that here. If you think we should I'll submit a new patch.
Is that one of the clocks implemented in drivers/sh/clk?
Correct, and in drivers/clk/shmobile/clk-mstp.c when http://www.spinics.net/lists/devicetree/msg12696.html will be merged.
There don't seem to be any error messages in the clk_enable() implementation.
There will be one when http://www.spinics.net/lists/linux-sh/msg25650.html will get merged :-) Before that enabling the clock never failed, with the patch applied the failure is logged.