* Re: [PATCH RESEND] video: w100fb: Reduce sleep mode battery discharge
[not found] <20120603103355.3845gmx1@mx072.gmx.net>
@ 2012-06-24 21:24 ` Florian Tobias Schandinat
2012-07-08 22:01 ` Florian Tobias Schandinat
1 sibling, 0 replies; 2+ messages in thread
From: Florian Tobias Schandinat @ 2012-06-24 21:24 UTC (permalink / raw)
To: Paul Parsons; +Cc: mreimer, philipp.zabel, linux-kernel, linux-fbdev
Hi Paul,
you should als the relevant mailing list, linux-fbdev (done now)
On 06/03/2012 10:33 AM, Paul Parsons wrote:
> In 2006 and 2007 the handhelds.org kernel w100fb driver was patched to
> reduce sleep mode battery discharge. Unfortunately those two patches
> never migrated to the mainline kernel.
>
> Fortunately the function affected - w100_suspend() - has not changed
> since; thus those patches still apply cleanly.
>
> Applying those patches to linux-3.4-rc3 running on an HP iPAQ hx4700
> reduces the sleep mode battery discharge from approximately 26 mA to
> approximately 11 mA.
>
> This patch combines those two patches into a single unified patch.
>
> Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
> Cc: Matt Reimer <mreimer@sdgsystems.com>
> Cc: Philipp Zabel <philipp.zabel@gmail.com>
Actually it would be good if we had the Signed-offs of the original
authors. Oh well, I think if it can't be helped yours should be sufficient.
> ---
>
> Many thanks to Matt Reimer for suggesting this.
>
> The seeming demise of handhelds.org has removed any formal patch logs.
> However the patches can still be viewed online:
> 2006 patch:
> http://paste.lisp.org/display/31700
> 2007 patch:
> http://osdir.com/ml/handhelds.linux.kernel/2007-02/msg00020.html
>
> And the fully patched handhelds.org kernel is still available, e.g.:
> http://www.linuxtogo.org/~goxboxlive/htcuniversal/Kernel/linux-2.6.21-hh20.tar.bz2
>
> drivers/video/w100fb.c | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/video/w100fb.c b/drivers/video/w100fb.c
> index 90a2e30..2f6b2b8 100644
> --- a/drivers/video/w100fb.c
> +++ b/drivers/video/w100fb.c
> @@ -1567,6 +1567,18 @@ static void w100_suspend(u32 mode)
> val = readl(remapped_regs + mmPLL_CNTL);
> val |= 0x00000004; /* bit2=1 */
> writel(val, remapped_regs + mmPLL_CNTL);
> +
> + writel(0x00000000, remapped_regs + mmLCDD_CNTL1);
> + writel(0x00000000, remapped_regs + mmLCDD_CNTL2);
> + writel(0x00000000, remapped_regs + mmGENLCD_CNTL1);
> + writel(0x00000000, remapped_regs + mmGENLCD_CNTL2);
> + writel(0x00000000, remapped_regs + mmGENLCD_CNTL3);
> +
> + val = readl(remapped_regs + mmMEM_EXT_CNTL);
> + val |= 0xF0000000;
> + val &= ~(0x00000001);
> + writel(val, remapped_regs + mmMEM_EXT_CNTL);
> +
If anyone understands what this change does (like for example disabling
the LCD controller) a comment would be useful.
> writel(0x0000001d, remapped_regs + mmPWRMGT_CNTL);
> }
> }
If nobody comments on this I will apply it in a few days.
Best regards,
Florian Tobias Schandinat
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH RESEND] video: w100fb: Reduce sleep mode battery discharge
[not found] <20120603103355.3845gmx1@mx072.gmx.net>
2012-06-24 21:24 ` [PATCH RESEND] video: w100fb: Reduce sleep mode battery discharge Florian Tobias Schandinat
@ 2012-07-08 22:01 ` Florian Tobias Schandinat
1 sibling, 0 replies; 2+ messages in thread
From: Florian Tobias Schandinat @ 2012-07-08 22:01 UTC (permalink / raw)
To: Paul Parsons; +Cc: mreimer, philipp.zabel, linux-kernel, linux-fbdev
On 06/03/2012 10:33 AM, Paul Parsons wrote:
> In 2006 and 2007 the handhelds.org kernel w100fb driver was patched to
> reduce sleep mode battery discharge. Unfortunately those two patches
> never migrated to the mainline kernel.
>
> Fortunately the function affected - w100_suspend() - has not changed
> since; thus those patches still apply cleanly.
>
> Applying those patches to linux-3.4-rc3 running on an HP iPAQ hx4700
> reduces the sleep mode battery discharge from approximately 26 mA to
> approximately 11 mA.
>
> This patch combines those two patches into a single unified patch.
>
> Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
> Cc: Matt Reimer <mreimer@sdgsystems.com>
> Cc: Philipp Zabel <philipp.zabel@gmail.com>
Applied.
Thanks,
Florian Tobias Schandinat
> ---
>
> Many thanks to Matt Reimer for suggesting this.
>
> The seeming demise of handhelds.org has removed any formal patch logs.
> However the patches can still be viewed online:
> 2006 patch:
> http://paste.lisp.org/display/31700
> 2007 patch:
> http://osdir.com/ml/handhelds.linux.kernel/2007-02/msg00020.html
>
> And the fully patched handhelds.org kernel is still available, e.g.:
> http://www.linuxtogo.org/~goxboxlive/htcuniversal/Kernel/linux-2.6.21-hh20.tar.bz2
>
> drivers/video/w100fb.c | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/video/w100fb.c b/drivers/video/w100fb.c
> index 90a2e30..2f6b2b8 100644
> --- a/drivers/video/w100fb.c
> +++ b/drivers/video/w100fb.c
> @@ -1567,6 +1567,18 @@ static void w100_suspend(u32 mode)
> val = readl(remapped_regs + mmPLL_CNTL);
> val |= 0x00000004; /* bit2=1 */
> writel(val, remapped_regs + mmPLL_CNTL);
> +
> + writel(0x00000000, remapped_regs + mmLCDD_CNTL1);
> + writel(0x00000000, remapped_regs + mmLCDD_CNTL2);
> + writel(0x00000000, remapped_regs + mmGENLCD_CNTL1);
> + writel(0x00000000, remapped_regs + mmGENLCD_CNTL2);
> + writel(0x00000000, remapped_regs + mmGENLCD_CNTL3);
> +
> + val = readl(remapped_regs + mmMEM_EXT_CNTL);
> + val |= 0xF0000000;
> + val &= ~(0x00000001);
> + writel(val, remapped_regs + mmMEM_EXT_CNTL);
> +
> writel(0x0000001d, remapped_regs + mmPWRMGT_CNTL);
> }
> }
^ permalink raw reply [flat|nested] 2+ messages in thread