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Date: Mon, 13 May 2024 19:26:58 +0300
From: "Gjorgji Rosikopulos (Consultant)" <quic_grosikop@...cinc.com>
To: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>, <rfoss@...nel.org>,
<todor.too@...il.com>, <bryan.odonoghue@...aro.org>,
<andersson@...nel.org>, <konrad.dybcio@...aro.org>,
<mchehab@...nel.org>
CC: <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <laurent.pinchart@...asonboard.com>,
<hverkuil-cisco@...all.nl>, <quic_hariramp@...cinc.com>
Subject: Re: [PATCH v3 8/8] media: qcom: camss: Decouple VFE from CSID
Hi Vladimir,
Thanks for the review,
On 5/13/2024 6:58 PM, Vladimir Zapolskiy wrote:
> On 4/11/24 15:45, Gjorgji Rosikopulos wrote:
>> From: Milen Mitkov <quic_mmitkov@...cinc.com>
>>
>> Decouple the direct calls to VFE's vfe_get/put in the CSID subdev
>> in order to prepare for the introduction of IFE subdev.
>>
>> Also decouple CSID base address from VFE since on the Titan platform
>> CSID register base address resides within VFE's base address.
>>
>> Signed-off-by: Milen Mitkov <quic_mmitkov@...cinc.com>
>> Signed-off-by: Gjorgji Rosikopulos <quic_grosikop@...cinc.com>
>> ---
>> .../media/platform/qcom/camss/camss-csid.c | 16 +++--
>> .../media/platform/qcom/camss/camss-csid.h | 1 +
>> drivers/media/platform/qcom/camss/camss.c | 69 +++++++++++++++++++
>> drivers/media/platform/qcom/camss/camss.h | 8 +++
>> 4 files changed, 89 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c
>> b/drivers/media/platform/qcom/camss/camss-csid.c
>> index 5b23f5b8746d..858db5d4ca75 100644
>> --- a/drivers/media/platform/qcom/camss/camss-csid.c
>> +++ b/drivers/media/platform/qcom/camss/camss-csid.c
>> @@ -602,7 +602,6 @@ static int csid_set_power(struct v4l2_subdev *sd,
>> int on)
>> struct csid_device *csid = v4l2_get_subdevdata(sd);
>> struct camss *camss = csid->camss;
>> struct device *dev = camss->dev;
>> - struct vfe_device *vfe = &camss->vfe[csid->id];
>> int ret = 0;
>> if (on) {
>> @@ -611,7 +610,7 @@ static int csid_set_power(struct v4l2_subdev *sd,
>> int on)
>> * switching on the CSID. Do so unconditionally, as there is no
>> * drawback in following the same powering order on older SoCs.
>> */
>> - ret = vfe_get(vfe);
>> + ret = csid->res->parent_dev_ops->get(camss, csid->id);
>> if (ret < 0)
>> return ret;
>> @@ -663,7 +662,7 @@ static int csid_set_power(struct v4l2_subdev
>> *sd, int on)
>> regulator_bulk_disable(csid->num_supplies,
>> csid->supplies);
>> pm_runtime_put_sync(dev);
>> - vfe_put(vfe);
>> + csid->res->parent_dev_ops->put(camss, csid->id);
>> }
>> return ret;
>> @@ -1021,6 +1020,11 @@ int msm_csid_subdev_init(struct camss *camss,
>> struct csid_device *csid,
>> csid->id = id;
>> csid->res = &res->csid;
>> + if (dev_WARN_ONCE(dev, !csid->res->parent_dev_ops,
>
> Please remove/replace dev_WARN_ONCE() to a lesser dev_warn_once(),
> wherever it's
> possible please do not use/introduce WARN() type of writes to the kernel
> log buffer...
The error is fatal and driver probe will fail if this happens,
it is good to have it in kernel log buffer.
However i agree it can be changed to dev_warn_once.
>
>> + "Error: CSID depends on VFE/IFE device ops!\n")) {
>> + return -EINVAL;
>> + }
>> +
>> csid->res->hw_ops->subdev_init(csid);
>> /* Memory */
>> @@ -1031,9 +1035,11 @@ int msm_csid_subdev_init(struct camss *camss,
>> struct csid_device *csid,
>> * VFE to be initialized before CSID
>> */
>> if (id >= 2) /* VFE/CSID lite */
>> - csid->base = camss->vfe[id].base + VFE_480_LITE_CSID_OFFSET;
>> + csid->base =
>> csid->res->parent_dev_ops->get_base_address(camss, id)
>> + + VFE_480_LITE_CSID_OFFSET;
>> else
>> - csid->base = camss->vfe[id].base + VFE_480_CSID_OFFSET;
>> + csid->base =
>> csid->res->parent_dev_ops->get_base_address(camss, id)
>> + + VFE_480_CSID_OFFSET;
>> } else {
>> csid->base = devm_platform_ioremap_resource_byname(pdev,
>> res->reg[0]);
>> if (IS_ERR(csid->base))
>> diff --git a/drivers/media/platform/qcom/camss/camss-csid.h
>> b/drivers/media/platform/qcom/camss/camss-csid.h
>> index 0e385d17c250..8cdae98e4dca 100644
>> --- a/drivers/media/platform/qcom/camss/camss-csid.h
>> +++ b/drivers/media/platform/qcom/camss/camss-csid.h
>> @@ -157,6 +157,7 @@ struct csid_hw_ops {
>> struct csid_subdev_resources {
>> bool is_lite;
>> const struct csid_hw_ops *hw_ops;
>> + const struct parent_dev_ops *parent_dev_ops;
>> const struct csid_formats *formats;
>> };
>> diff --git a/drivers/media/platform/qcom/camss/camss.c
>> b/drivers/media/platform/qcom/camss/camss.c
>> index 37060eaa0ba5..4d625ef59cf7 100644
>> --- a/drivers/media/platform/qcom/camss/camss.c
>> +++ b/drivers/media/platform/qcom/camss/camss.c
>> @@ -32,6 +32,8 @@
>> #define CAMSS_CLOCK_MARGIN_NUMERATOR 105
>> #define CAMSS_CLOCK_MARGIN_DENOMINATOR 100
>> +static const struct parent_dev_ops vfe_parent_dev_ops;
>> +
>> static const struct camss_subdev_resources csiphy_res_8x16[] = {
>> /* CSIPHY0 */
>> {
>> @@ -87,6 +89,7 @@ static const struct camss_subdev_resources
>> csid_res_8x16[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_1,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_1
>> }
>> },
>> @@ -109,6 +112,7 @@ static const struct camss_subdev_resources
>> csid_res_8x16[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_1,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_1
>> }
>> },
>> @@ -226,6 +230,7 @@ static const struct camss_subdev_resources
>> csid_res_8x96[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> },
>> @@ -248,6 +253,7 @@ static const struct camss_subdev_resources
>> csid_res_8x96[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> },
>> @@ -270,6 +276,7 @@ static const struct camss_subdev_resources
>> csid_res_8x96[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> },
>> @@ -292,6 +299,7 @@ static const struct camss_subdev_resources
>> csid_res_8x96[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> }
>> @@ -445,6 +453,7 @@ static const struct camss_subdev_resources
>> csid_res_660[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> },
>> @@ -470,6 +479,7 @@ static const struct camss_subdev_resources
>> csid_res_660[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> },
>> @@ -495,6 +505,7 @@ static const struct camss_subdev_resources
>> csid_res_660[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> },
>> @@ -520,6 +531,7 @@ static const struct camss_subdev_resources
>> csid_res_660[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_4_7,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_4_7
>> }
>> }
>> @@ -714,6 +726,7 @@ static const struct camss_subdev_resources
>> csid_res_845[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -739,6 +752,7 @@ static const struct camss_subdev_resources
>> csid_res_845[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -765,6 +779,7 @@ static const struct camss_subdev_resources
>> csid_res_845[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> }
>> @@ -957,6 +972,7 @@ static const struct camss_subdev_resources
>> csid_res_8250[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -974,6 +990,7 @@ static const struct camss_subdev_resources
>> csid_res_8250[] = {
>> .type = CAMSS_SUBDEV_TYPE_CSID,
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -991,6 +1008,7 @@ static const struct camss_subdev_resources
>> csid_res_8250[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1008,6 +1026,7 @@ static const struct camss_subdev_resources
>> csid_res_8250[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> }
>> @@ -1212,6 +1231,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .interrupt = { "csid0" },
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1227,6 +1247,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .interrupt = { "csid1" },
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1242,6 +1263,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .interrupt = { "csid2" },
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1257,6 +1279,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .interrupt = { "csid3" },
>> .csid = {
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1272,6 +1295,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1287,6 +1311,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1302,6 +1327,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> },
>> @@ -1317,6 +1343,7 @@ static const struct camss_subdev_resources
>> csid_res_sc8280xp[] = {
>> .csid = {
>> .is_lite = true,
>> .hw_ops = &csid_ops_gen2,
>> + .parent_dev_ops = &vfe_parent_dev_ops,
>> .formats = &csid_formats_gen2
>> }
>> }
>> @@ -1661,6 +1688,48 @@ void camss_pm_domain_off(struct camss *camss,
>> int id)
>> }
>> }
>> +static int vfe_parent_dev_ops_get(struct camss *camss, int id)
>> +{
>> + int ret = -EINVAL;
>> +
>> + if (id < camss->res->vfe_num) {
>
>
> if (id >= camss->res->vfe_num)
> return -EINVAL;
:-). I believe this is metter of personal taste. I also like
the code which you have posted. But with function of this size
i dont see that it will make any difference.
>
>> + struct vfe_device *vfe = &camss->vfe[id];
>> +
>> + ret = vfe_get(vfe);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int vfe_parent_dev_ops_put(struct camss *camss, int id)
>> +{
>> + if (id < camss->res->vfe_num) {
>> + struct vfe_device *vfe = &camss->vfe[id];
>> +
>> + vfe_put(vfe);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void __iomem
>> +*vfe_parent_dev_ops_get_base_address(struct camss *camss, int id)
>> +{
>> + if (id < camss->res->vfe_num) {
>> + struct vfe_device *vfe = &camss->vfe[id];
>> +
>> + return vfe->base;
>> + }
>> +
>> + return NULL;
>
> I can find code snippets above like
>
> if (IS_ERR(csid->base))
> ...
>
> So, is it really a good idea to return NULL on error? Probably it might
> be better
> to return a reasonable error to the caller.
As general rule i agree. But here either we have address or not,
i dont see the reason to return an error code. Also i dont see what
caller will do if he gets error code instead of NULL.
I am refering in particular this case. If we have different error paths
of failiure maybe it will more sense.
>
>> +}
>> +
>> +static const struct parent_dev_ops vfe_parent_dev_ops = {
>> + .get = vfe_parent_dev_ops_get,
>> + .put = vfe_parent_dev_ops_put,
>> + .get_base_address = vfe_parent_dev_ops_get_base_address
>> +};
>> +
>> /*
>> * camss_of_parse_endpoint_node - Parse port endpoint node
>> * @dev: Device
>> diff --git a/drivers/media/platform/qcom/camss/camss.h
>> b/drivers/media/platform/qcom/camss/camss.h
>> index a5be9e872992..b3c967bcf8a9 100644
>> --- a/drivers/media/platform/qcom/camss/camss.h
>> +++ b/drivers/media/platform/qcom/camss/camss.h
>> @@ -143,6 +143,12 @@ struct camss_clock {
>> u32 nfreqs;
>> };
>> +struct parent_dev_ops {
>> + int (*get)(struct camss *camss, int id);
>> + int (*put)(struct camss *camss, int id);
>> + void __iomem *(*get_base_address)(struct camss *camss, int id);
>> +};
>> +
>> void camss_add_clock_margin(u64 *rate);
>> int camss_enable_clocks(int nclocks, struct camss_clock *clock,
>> struct device *dev);
>> @@ -153,6 +159,8 @@ s64 camss_get_link_freq(struct media_entity
>> *entity, unsigned int bpp,
>> int camss_get_pixel_clock(struct media_entity *entity, u64
>> *pixel_clock);
>> int camss_pm_domain_on(struct camss *camss, int id);
>> void camss_pm_domain_off(struct camss *camss, int id);
>> +int camss_vfe_get(struct camss *camss, int id);
>> +void camss_vfe_put(struct camss *camss, int id);
>> void camss_delete(struct camss *camss);
>> #endif /* QC_MSM_CAMSS_H */
>
> --
> Best wishes,
> Vladimir
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