Re: 答复: [PATCH] staging: sm750:Fixthe Makefile option error

陈华才 chenhc at
Mon Apr 27 02:04:20 UTC 2015

Hi, Sudip and Teddy,

I have found the root cause of Logo problem:
1, enable hw_accel, staging driver cannot show logo.
2, disable hw_accel, staging driver can show logo.
3, both enable/disable hw_accel, my driver (1.0.8) can show logo.
Deep in code: 
In staging driver, drivers/staging/sm750fb/sm750.c, lynxfb_ops_imageblit(), if image->depth != 1, it returns and do nothing. 
In my driver (1.0.8), if image->depth != 1, it fallback to cfb_imageblit().

I will send a patch to fix this.

------------------ Original ------------------
From:  "Sudip Mukherjee"<sudipm.mukherjee at>;
Date:  Fri, Apr 24, 2015 04:25 PM
To:  "陈华才"<chenhc at>; 
Cc:  "Teddy Wang 王力强"< at>; "Binbin Zhou"<zhoubb at>; "Greg Kroah-Hartman"<gregkh at>; "devel"<devel at>; "Fuxin Zhang"<zhangfx at>; 
Subject:  Re:  答复: [PATCH] staging: sm750:Fixthe Makefile option error

On Fri, Apr 24, 2015 at 03:33:58PM +0800, 陈华才 wrote:
> Hi, Sudip,
> Upstream driver still can't show logo, we are debugging.

Hi Huacai,
I checked with the upstream driver only.
I checked with next-20150423 and it showed me the penguin logo on upper
left hand corner of my screen when CONFIG_FB_SM750=y.
only extra thing was that your patch of the Makefile was applied.
maybe you can consider gifting me one your notepads so that I can
also see the problem :)



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