Re: [PATCH v4 3/3] media: rockchip: rkisp1: extend uapi array sizes

From: "Heiko Stübner" <heiko@sntech.de>
To: helen.koike@collabora.com, linux-media@vger.kernel.org,
	mchehab@kernel.org, Laurent.pinchart@ideasonboard.com,
	hverkuil@xs4all.nl,
	Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Cc: linux-rockchip@lists.infradead.org, tfiga@chromium.org,
	ezequiel@collabora.com, christoph.muellner@theobroma-systems.com
Subject: Re: [PATCH v4 3/3] media: rockchip: rkisp1: extend uapi array sizes
Date: Sat, 16 Jan 2021 00:52:17 +0100	[thread overview]
Message-ID: <1739328.QCnGb9OGeP@diego> (raw)
In-Reply-To: <6a1a7cb2-7c37-6cbc-43e7-45e5b0b80e21@collabora.com>

Hi Dafna,

Am Freitag, 15. Januar 2021, 18:41:06 CET schrieb Dafna Hirschfeld:
> 
> Am 15.01.21 um 17:38 schrieb Heiko Stuebner:
> > From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> > 
> > Later variants of the rkisp1 block use more entries in some arrays:
> > 
> > RKISP1_CIF_ISP_AE_MEAN_MAX                 25 -> 81
> > RKISP1_CIF_ISP_HIST_BIN_N_MAX              16 -> 32
> > RKISP1_CIF_ISP_GAMMA_OUT_MAX_SAMPLES       17 -> 34
> > RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE 28 -> 81
> 
> I see you didn't change the value for that define.

In the below patch I find

@@ -103,7 +111,9 @@
* Histogram calculation
*/
/* Last 3 values unused. */
-#define RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE 28
+#define RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE_V10 28
+#define RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE_V12 81
+#define RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE     RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE_V12

so I'm not sure I understand what you mean except this.

> The usage of it is a bit more complicated.
> It is used in function rkisp1_hst_config.

Yeah, though the for-loop iterates over 4*7 entry values, so stays
below the RKISP1_CIF_ISP_HISTOGRAM_WEIGHT_GRIDS_SIZE_V10 in all cases.


> Actually the real number of weight values are 25 (5x5) for rk3399,
> the last 3 are not used. I think that in order to support both
> 5x5 and 9x9 the code in rkisp1-params.c should change. I'll
> send a patch fixing it.

If you look at my V12-patch [0] the weight handling is done different there
and from the registers, it looks like they exchanges that part of the isp.

[0] https://lore.kernel.org/linux-media/20210108193311.3423236-11-heiko@sntech.de/
void rkisp1_hst_config_v12() as a search term

[...]

> > @@ -862,8 +898,16 @@ struct rkisp1_cif_isp_af_stat {
> >    *
> >    * @hist_bins: measured bin counters
> >    *
> > - * Measurement window divided into 16 sub-windows, set
> > - * with ISP_HIST_XXX
> > + * Measurement window divided into 16 sub-windows for V10/V10
> > + * and 32 sub-windows for V12/V13, set with ISP_HIST_XXX
> 
> It is actually not windows but histogram bins. Could you change it to:
> "The histogram values divided into 16 bins for V10/V11 and 32 bins
> for V12/V13. It is configured within the struct rkisp1_cif_isp_hst_config.

I've changed this like your suggestions and will give a bit of time for
the stuff above. But I guess I can send a v5 some time tomorrow?


Thanks for your input
Heiko



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