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[PATCH 1/2] staging: atomisp: simplify the if condition in atomisp_freq_scaling()

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  [PATCH 1/2] staging: atomisp: simplify the if condition in  atomisp_freq_scaling() Daeseok Youn <daeseok.youn@gmail.com> - 2017-03-30 08:30 +0200
    Re: [PATCH 1/2] staging: atomisp: simplify the if condition in  atomisp_freq_scaling() Alan Cox <alan@linux.intel.com> - 2017-03-30 13:00 +0200
      Re: [PATCH 1/2] staging: atomisp: simplify the if condition in atomisp_freq_scaling() DaeSeok Youn <daeseok.youn@gmail.com> - 2017-03-30 17:50 +0200

#1612585 — [PATCH 1/2] staging: atomisp: simplify the if condition in atomisp_freq_scaling()

The condition line in if-statement is needed to be shorthen to
improve readability.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
---
 drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c
index 94bc793..eebfccd 100644
--- a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c
@@ -255,14 +255,17 @@ int atomisp_freq_scaling(struct atomisp_device *isp,
 	struct atomisp_freq_scaling_rule curr_rules;
 	int i, ret;
 	unsigned short fps = 0;
+	unsigned short masked_dev = 0;
 
 	if (isp->sw_contex.power_state != ATOM_ISP_POWER_UP) {
 		dev_err(isp->dev, "DFS cannot proceed due to no power.\n");
 		return -EINVAL;
 	}
 
-	if ((isp->pdev->device & ATOMISP_PCI_DEVICE_SOC_MASK) ==
-		ATOMISP_PCI_DEVICE_SOC_CHT && ATOMISP_USE_YUVPP(asd))
+	masked_dev = isp->pdev->device & ATOMISP_PCI_DEVICE_SOC_MASK;
+
+	if (masked_dev == ATOMISP_PCI_DEVICE_SOC_CHT &&
+	    ATOMISP_USE_YUVPP(asd))
 		isp->dfs = &dfs_config_cht_soc;
 
 	if (isp->dfs->lowest_freq == 0 || isp->dfs->max_freq_at_vmin == 0 ||
-- 
1.9.1

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#1612953

On Thu, 2017-03-30 at 15:24 +0900, Daeseok Youn wrote:
> The condition line in if-statement is needed to be shorthen to
> improve readability.
> 
> Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
> ---

How about a define for ATOMISP_IS_CHT(isp) instead - as we will need
these tests in other places where there are ISP2400/ISP2401 ifdefs ?

Alan

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#1613239 — Re: [PATCH 1/2] staging: atomisp: simplify the if condition in atomisp_freq_scaling()

2017-03-30 19:52 GMT+09:00 Alan Cox <alan@linux.intel.com>:
> On Thu, 2017-03-30 at 15:24 +0900, Daeseok Youn wrote:
>> The condition line in if-statement is needed to be shorthen to
>> improve readability.
>>
>> Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
>> ---
>
> How about a define for ATOMISP_IS_CHT(isp) instead - as we will need
hmm.. I think there is another way to get a *device*(unsigned short or
__u32) to mask with "ATOMISP_PCI_DEVICE_SOC_MASK".
In the atomisp_freq_scaling() function, the "device" value is getting
started from "isp" structure.
(isp->pdev->device)

if the function has only "pci_dev" struction as a parameter and it
need to check the CHT. Then we cannot use the definition like
ATOMISP_IS_CHT(isp). it means we have another definition to check the
CHT.

Am I right?

> these tests in other places where there are ISP2400/ISP2401 ifdefs ?
I am not sure whether these tests are needed in other place or not.
(Actually, I didn't find good H/W reference for Atom ISP device - Can
you please share the link to refer document like H/W manual to
develop?) I have tried to clean up the code first. in the meantime, I
will have a look at the document if I have good reference manual.

Thanks.
Regards,
Daeseok.
>
> Alan
>

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