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Date: Tue, 14 Apr 2020 13:56:00 +0200
From: Niklas Söderlund
<niklas.soderlund@...natech.se>
To: Suresh Udipi <sudipi@...adit-jv.com>
Cc: akiyama@...-osk.co.jp, efriedrich@...adit-jv.com,
erosca@...adit-jv.com, hverkuil-cisco@...all.nl,
jacopo+renesas@...ndi.org, laurent.pinchart@...asonboard.com,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
linux-renesas-soc@...r.kernel.org, mrodin@...adit-jv.com,
securitycheck@...so.co.jp
Subject: Re: [PATCH v4] media: rcar-csi2: Correct the selection of hsfreqrange
Hello Suresh,
Thanks for your patch.
On 2020-03-23 13:48:44 +0900, Suresh Udipi wrote:
> hsfreqrange should be chosen based on the calculated mbps which
> is within the range as per table[1]. But current calculation
> always selects first value which is greater than or equal to the
> calculated mbps which may lead to chosing a wrong range in some cases.
>
> For example for 360 mbps for H3/M3N
> Existing logic selects
> Calculated value 360Mbps : Default 400Mbps Range [368.125 -433.125 mbps]
>
> This hsfreqrange is out of range.
>
> The logic is changed to select the first hsfreqrange whose max range[1] is
> greater than the calculated bit rate.
>
> Calculated value 360Mbps : max range 380.625 mbps is selected
> i.e Default 350Mbps Range [320.625 -380.625 mpbs]
>
> [1] specs r19uh0105ej0200-r-car-3rd-generation.pdf [Table 25.9]
>
> Fixes: 769afd212b16 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
>
> Signed-off-by: Suresh Udipi <sudipi@...adit-jv.com>
> Signed-off-by: Kazuyoshi Akiyama <akiyama@...-osk.co.jp>
> ---
> Changes in v2:
> - Added the boundary check for the maximum bit rate.
>
> - Simplified the logic by remmoving range check
> as only the closest default value covers most
> of the use cases.
>
> - Aligning the commit message based on the above change
>
>
> Changes in v3:
> - Added max member from struct rcsi2_mbps_reg.
> mbps varialbe cannot be removed from rcsi2_mbps_reg,
> since this structure is reused for
> phtw_mbps_h3_v3h_m3n/phtw_mbps_v3m_e3 where mbps is
> used.
>
>
> - Update the walk of the array in rcsi2_set_phypll() so that it finds
> the first entry where the calculated bit rate is less than the max.
>
> - Support lower bit rates less than 80Mbps like 48Mbps
> (Raspberry pi camera 640x480 connected to Kingfisher)
> can also be supported by selecting the lowest default bit rate 80Mbps
> as done before this fix
>
> - Alignement of the commit message based on above changes.
>
> Changes in v4:
> - Remove unncessary braces.
>
> drivers/media/platform/rcar-vin/rcar-csi2.c | 179 ++++++++++++++--------------
> 1 file changed, 90 insertions(+), 89 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> index faa9fb2..ca0321d 100644
> --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> @@ -134,6 +134,7 @@ struct phtw_value {
> struct rcsi2_mbps_reg {
> u16 mbps;
You should remove the mbps field and then update the other tables with
the max value. Apart from this I like this patch, nice work.
> u16 reg;
> + u16 max;
> };
>
> static const struct rcsi2_mbps_reg phtw_mbps_h3_v3h_m3n[] = {
> @@ -201,96 +202,96 @@ static const struct rcsi2_mbps_reg phtw_mbps_v3m_e3[] = {
> #define PHYPLL_HSFREQRANGE(n) ((n) << 16)
>
> static const struct rcsi2_mbps_reg hsfreqrange_h3_v3h_m3n[] = {
> - { .mbps = 80, .reg = 0x00 },
> - { .mbps = 90, .reg = 0x10 },
> - { .mbps = 100, .reg = 0x20 },
> - { .mbps = 110, .reg = 0x30 },
> - { .mbps = 120, .reg = 0x01 },
> - { .mbps = 130, .reg = 0x11 },
> - { .mbps = 140, .reg = 0x21 },
> - { .mbps = 150, .reg = 0x31 },
> - { .mbps = 160, .reg = 0x02 },
> - { .mbps = 170, .reg = 0x12 },
> - { .mbps = 180, .reg = 0x22 },
> - { .mbps = 190, .reg = 0x32 },
> - { .mbps = 205, .reg = 0x03 },
> - { .mbps = 220, .reg = 0x13 },
> - { .mbps = 235, .reg = 0x23 },
> - { .mbps = 250, .reg = 0x33 },
> - { .mbps = 275, .reg = 0x04 },
> - { .mbps = 300, .reg = 0x14 },
> - { .mbps = 325, .reg = 0x25 },
> - { .mbps = 350, .reg = 0x35 },
> - { .mbps = 400, .reg = 0x05 },
> - { .mbps = 450, .reg = 0x16 },
> - { .mbps = 500, .reg = 0x26 },
> - { .mbps = 550, .reg = 0x37 },
> - { .mbps = 600, .reg = 0x07 },
> - { .mbps = 650, .reg = 0x18 },
> - { .mbps = 700, .reg = 0x28 },
> - { .mbps = 750, .reg = 0x39 },
> - { .mbps = 800, .reg = 0x09 },
> - { .mbps = 850, .reg = 0x19 },
> - { .mbps = 900, .reg = 0x29 },
> - { .mbps = 950, .reg = 0x3a },
> - { .mbps = 1000, .reg = 0x0a },
> - { .mbps = 1050, .reg = 0x1a },
> - { .mbps = 1100, .reg = 0x2a },
> - { .mbps = 1150, .reg = 0x3b },
> - { .mbps = 1200, .reg = 0x0b },
> - { .mbps = 1250, .reg = 0x1b },
> - { .mbps = 1300, .reg = 0x2b },
> - { .mbps = 1350, .reg = 0x3c },
> - { .mbps = 1400, .reg = 0x0c },
> - { .mbps = 1450, .reg = 0x1c },
> - { .mbps = 1500, .reg = 0x2c },
> + { .reg = 0x00, .max = 97 },
> + { .reg = 0x10, .max = 107 },
> + { .reg = 0x20, .max = 118 },
> + { .reg = 0x30, .max = 128 },
> + { .reg = 0x01, .max = 139 },
> + { .reg = 0x11, .max = 149 },
> + { .reg = 0x21, .max = 160 },
> + { .reg = 0x31, .max = 170 },
> + { .reg = 0x02, .max = 181 },
> + { .reg = 0x12, .max = 191 },
> + { .reg = 0x22, .max = 202 },
> + { .reg = 0x32, .max = 212 },
> + { .reg = 0x03, .max = 228 },
> + { .reg = 0x13, .max = 224 },
> + { .reg = 0x23, .max = 259 },
> + { .reg = 0x33, .max = 275 },
> + { .reg = 0x04, .max = 301 },
> + { .reg = 0x14, .max = 328 },
> + { .reg = 0x25, .max = 354 },
> + { .reg = 0x35, .max = 380 },
> + { .reg = 0x05, .max = 433 },
> + { .reg = 0x16, .max = 485 },
> + { .reg = 0x26, .max = 538 },
> + { .reg = 0x37, .max = 590 },
> + { .reg = 0x07, .max = 643 },
> + { .reg = 0x18, .max = 695 },
> + { .reg = 0x28, .max = 748 },
> + { .reg = 0x39, .max = 800 },
> + { .reg = 0x09, .max = 853 },
> + { .reg = 0x19, .max = 905 },
> + { .reg = 0x29, .max = 958 },
> + { .reg = 0x3a, .max = 1010 },
> + { .reg = 0x0a, .max = 1063 },
> + { .reg = 0x1a, .max = 1115 },
> + { .reg = 0x2a, .max = 1168 },
> + { .reg = 0x3b, .max = 1220 },
> + { .reg = 0x0b, .max = 1273 },
> + { .reg = 0x1b, .max = 1325 },
> + { .reg = 0x2b, .max = 1378 },
> + { .reg = 0x3c, .max = 1430 },
> + { .reg = 0x0c, .max = 1483 },
> + { .reg = 0x1c, .max = 1500 },
> + { .reg = 0x2c, .max = 1500 },
> { /* sentinel */ },
> };
>
> static const struct rcsi2_mbps_reg hsfreqrange_m3w_h3es1[] = {
> - { .mbps = 80, .reg = 0x00 },
> - { .mbps = 90, .reg = 0x10 },
> - { .mbps = 100, .reg = 0x20 },
> - { .mbps = 110, .reg = 0x30 },
> - { .mbps = 120, .reg = 0x01 },
> - { .mbps = 130, .reg = 0x11 },
> - { .mbps = 140, .reg = 0x21 },
> - { .mbps = 150, .reg = 0x31 },
> - { .mbps = 160, .reg = 0x02 },
> - { .mbps = 170, .reg = 0x12 },
> - { .mbps = 180, .reg = 0x22 },
> - { .mbps = 190, .reg = 0x32 },
> - { .mbps = 205, .reg = 0x03 },
> - { .mbps = 220, .reg = 0x13 },
> - { .mbps = 235, .reg = 0x23 },
> - { .mbps = 250, .reg = 0x33 },
> - { .mbps = 275, .reg = 0x04 },
> - { .mbps = 300, .reg = 0x14 },
> - { .mbps = 325, .reg = 0x05 },
> - { .mbps = 350, .reg = 0x15 },
> - { .mbps = 400, .reg = 0x25 },
> - { .mbps = 450, .reg = 0x06 },
> - { .mbps = 500, .reg = 0x16 },
> - { .mbps = 550, .reg = 0x07 },
> - { .mbps = 600, .reg = 0x17 },
> - { .mbps = 650, .reg = 0x08 },
> - { .mbps = 700, .reg = 0x18 },
> - { .mbps = 750, .reg = 0x09 },
> - { .mbps = 800, .reg = 0x19 },
> - { .mbps = 850, .reg = 0x29 },
> - { .mbps = 900, .reg = 0x39 },
> - { .mbps = 950, .reg = 0x0a },
> - { .mbps = 1000, .reg = 0x1a },
> - { .mbps = 1050, .reg = 0x2a },
> - { .mbps = 1100, .reg = 0x3a },
> - { .mbps = 1150, .reg = 0x0b },
> - { .mbps = 1200, .reg = 0x1b },
> - { .mbps = 1250, .reg = 0x2b },
> - { .mbps = 1300, .reg = 0x3b },
> - { .mbps = 1350, .reg = 0x0c },
> - { .mbps = 1400, .reg = 0x1c },
> - { .mbps = 1450, .reg = 0x2c },
> - { .mbps = 1500, .reg = 0x3c },
> + { .reg = 0x00, .max = 110 },
> + { .reg = 0x10, .max = 120 },
> + { .reg = 0x20, .max = 131 },
> + { .reg = 0x30, .max = 141 },
> + { .reg = 0x01, .max = 152 },
> + { .reg = 0x11, .max = 162 },
> + { .reg = 0x21, .max = 173 },
> + { .reg = 0x31, .max = 183 },
> + { .reg = 0x02, .max = 194 },
> + { .reg = 0x12, .max = 204 },
> + { .reg = 0x22, .max = 215 },
> + { .reg = 0x32, .max = 225 },
> + { .reg = 0x03, .max = 241 },
> + { .reg = 0x13, .max = 257 },
> + { .reg = 0x23, .max = 273 },
> + { .reg = 0x33, .max = 275 },
> + { .reg = 0x04, .max = 301 },
> + { .reg = 0x14, .max = 328 },
> + { .reg = 0x05, .max = 354 },
> + { .reg = 0x15, .max = 393 },
> + { .reg = 0x25, .max = 446 },
> + { .reg = 0x06, .max = 498 },
> + { .reg = 0x16, .max = 551 },
> + { .reg = 0x07, .max = 603 },
> + { .reg = 0x17, .max = 656 },
> + { .reg = 0x08, .max = 708 },
> + { .reg = 0x18, .max = 761 },
> + { .reg = 0x09, .max = 813 },
> + { .reg = 0x19, .max = 866 },
> + { .reg = 0x29, .max = 918 },
> + { .reg = 0x39, .max = 971 },
> + { .reg = 0x0a, .max = 1023 },
> + { .reg = 0x1a, .max = 1076 },
> + { .reg = 0x2a, .max = 1128 },
> + { .reg = 0x3a, .max = 1181 },
> + { .reg = 0x0b, .max = 1233 },
> + { .reg = 0x1b, .max = 1286 },
> + { .reg = 0x2b, .max = 1338 },
> + { .reg = 0x3b, .max = 1391 },
> + { .reg = 0x0c, .max = 1443 },
> + { .reg = 0x1c, .max = 1496 },
> + { .reg = 0x2c, .max = 1500 },
> + { .reg = 0x3c, .max = 1500 },
> { /* sentinel */ },
> };
>
> @@ -432,11 +433,11 @@ static int rcsi2_set_phypll(struct rcar_csi2 *priv, unsigned int mbps)
> {
> const struct rcsi2_mbps_reg *hsfreq;
>
> - for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++)
> - if (hsfreq->mbps >= mbps)
> + for (hsfreq = priv->info->hsfreqrange; hsfreq->max != 0; hsfreq++)
> + if (hsfreq->max >= mbps)
> break;
>
> - if (!hsfreq->mbps) {
> + if (!hsfreq->max) {
> dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps);
> return -ERANGE;
> }
> --
> 2.7.4
>
--
Regards,
Niklas Söderlund
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