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SubjectRe: [PATCH v7 3/3] media: vimc: Add a control to display info on test image
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Hi Helen, Kaaira,

On 30/06/2020 14:46, Helen Koike wrote:
> Hi Kaaira,
>
> On 6/30/20 10:25 AM, Kaaira Gupta wrote:
>> On Fri, Jun 26, 2020 at 01:01:03PM -0300, Helen Koike wrote:
>>> Hi Kaaira,
>>>
>>> On 6/26/20 10:07 AM, Kaaira Gupta wrote:
>>>> Add a control in VIMC to display information such as the correct order of
>>>> colors for a given test pattern, brightness, hue, saturation, contrast,
>>>> width and height at sensor over test image.
>>>>
>>>> Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
>>>> ---
>>>> drivers/media/test-drivers/vimc/Kconfig | 2 +
>>>> drivers/media/test-drivers/vimc/vimc-common.h | 1 +
>>>> drivers/media/test-drivers/vimc/vimc-core.c | 10 +++
>>>> drivers/media/test-drivers/vimc/vimc-sensor.c | 70 +++++++++++++++++++
>>>> 4 files changed, 83 insertions(+)
>>>>
>>>> diff --git a/drivers/media/test-drivers/vimc/Kconfig b/drivers/media/test-drivers/vimc/Kconfig
>>>> index 4068a67585f9..da4b2ad6e40c 100644
>>>> --- a/drivers/media/test-drivers/vimc/Kconfig
>>>> +++ b/drivers/media/test-drivers/vimc/Kconfig
>>>> @@ -2,6 +2,8 @@
>>>> config VIDEO_VIMC
>>>> tristate "Virtual Media Controller Driver (VIMC)"
>>>> depends on VIDEO_DEV && VIDEO_V4L2
>>>> + select FONT_SUPPORT
>>>> + select FONT_8x16
>>>> select MEDIA_CONTROLLER
>>>> select VIDEO_V4L2_SUBDEV_API
>>>> select VIDEOBUF2_VMALLOC
>>>> diff --git a/drivers/media/test-drivers/vimc/vimc-common.h b/drivers/media/test-drivers/vimc/vimc-common.h
>>>> index ae163dec2459..a289434e75ba 100644
>>>> --- a/drivers/media/test-drivers/vimc/vimc-common.h
>>>> +++ b/drivers/media/test-drivers/vimc/vimc-common.h
>>>> @@ -20,6 +20,7 @@
>>>> #define VIMC_CID_VIMC_CLASS (0x00f00000 | 1)
>>>> #define VIMC_CID_TEST_PATTERN (VIMC_CID_VIMC_BASE + 0)
>>>> #define VIMC_CID_MEAN_WIN_SIZE (VIMC_CID_VIMC_BASE + 1)
>>>> +#define VIMC_CID_OSD_TEXT_MODE (VIMC_CID_VIMC_BASE + 2)
>>>>
>>>> #define VIMC_FRAME_MAX_WIDTH 4096
>>>> #define VIMC_FRAME_MAX_HEIGHT 2160
>>>> diff --git a/drivers/media/test-drivers/vimc/vimc-core.c b/drivers/media/test-drivers/vimc/vimc-core.c
>>>> index 11210aaa2551..4b0ae6f51d76 100644
>>>> --- a/drivers/media/test-drivers/vimc/vimc-core.c
>>>> +++ b/drivers/media/test-drivers/vimc/vimc-core.c
>>>> @@ -5,10 +5,12 @@
>>>> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
>>>> */
>>>>
>>>> +#include <linux/font.h>
>>>> #include <linux/init.h>
>>>> #include <linux/module.h>
>>>> #include <linux/platform_device.h>
>>>> #include <media/media-device.h>
>>>> +#include <media/tpg/v4l2-tpg.h>
>>>> #include <media/v4l2-device.h>
>>>>
>>>> #include "vimc-common.h"
>>>> @@ -263,11 +265,19 @@ static int vimc_register_devices(struct vimc_device *vimc)
>>>>
>>>> static int vimc_probe(struct platform_device *pdev)
>>>> {
>>>> + const struct font_desc *font = find_font("VGA8x16");
>>>> struct vimc_device *vimc;
>>>> int ret;
>>>>
>>>> dev_dbg(&pdev->dev, "probe");
>>>>
>>>> + if (!font) {
>>>> + dev_err(&pdev->dev, "could not find font\n");
>>>> + return -ENODEV;
>>>> + }
>>>> +
>>>> + tpg_set_font(font->data);
>>>> +
>>>> vimc = kzalloc(sizeof(*vimc), GFP_KERNEL);
>>>> if (!vimc)
>>>> return -ENOMEM;
>>>> diff --git a/drivers/media/test-drivers/vimc/vimc-sensor.c b/drivers/media/test-drivers/vimc/vimc-sensor.c
>>>> index a2f09ac9a360..9e4fb3f4d60d 100644
>>>> --- a/drivers/media/test-drivers/vimc/vimc-sensor.c
>>>> +++ b/drivers/media/test-drivers/vimc/vimc-sensor.c
>>>> @@ -19,6 +19,8 @@ struct vimc_sen_device {
>>>> struct v4l2_subdev sd;
>>>> struct tpg_data tpg;
>>>> u8 *frame;
>>>> + unsigned int osd_mode;
>>>
>>> If you declare the enum outside the below function, this could be type osd_mode instead of unsigned int, what do you think?
>>>
>>>> + u64 start_stream_ts;
>>>> /* The active format */
>>>> struct v4l2_mbus_framefmt mbus_format;
>>>> struct v4l2_ctrl_handler hdl;
>>>> @@ -187,8 +189,54 @@ static void *vimc_sen_process_frame(struct vimc_ent_device *ved,
>>>> {
>>>> struct vimc_sen_device *vsen = container_of(ved, struct vimc_sen_device,
>>>> ved);
>>>> + enum osd_mode {OSD_SHOW_ALL = 0, OSD_SHOW_COUNTERS = 1, OSD_SHOW_NONE = 2};
>>>> + const unsigned int line_height = 16;
>>>> + u8 *basep[TPG_MAX_PLANES][2];
>>>> + unsigned int line = 1;
>>>> + char str[100];
>>>>
>>>> tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame);
>>>> + tpg_calc_text_basep(&vsen->tpg, basep, 0, vsen->frame);
>>>> + switch (vsen->osd_mode) {
>>>> + case OSD_SHOW_ALL:
>>>> + {
>>>
>>> Usually we don't use this curly braces in a case statement, please, check other examples in the code,
>>
>> I have declared variables inside the cases,hence they are not just
>> statements, so I need to use them I think
>
> Doing this grep:
>
> git grep -A1 "case.*:" drivers/media | grep -B1 -P "\tstruct"

Aha, yes - they might indeed be needed then because of the local scope
variables...

>
> I see that the standard is to place the curly braces in the same line of the case statement,
> example: https://elixir.bootlin.com/linux/latest/source/drivers/media/v4l2-core/v4l2-subdev.c#L469
>
>>
>>>
>>>> + const char *order = tpg_g_color_order(&vsen->tpg);
>>>
>>> You also don't need this level of identation.
>>
>> I used it because of the braces
>
> Please check the example above
>
>>
>>>
>>>> +
>>>> + tpg_gen_text(&vsen->tpg, basep,
>>>> + line++ * line_height, 16, order);
>>>> + snprintf(str, sizeof(str),
>>>> + "brightness %3d, contrast %3d, saturation %3d, hue %d ",
>>>> + vsen->tpg.brightness,
>>>> + vsen->tpg.contrast,
>>>> + vsen->tpg.saturation,
>>>> + vsen->tpg.hue);
>>>> + tpg_gen_text(&vsen->tpg, basep, line++ * line_height,
>>>> + 16, str);
>>>> + snprintf(str, sizeof(str), "sensor size: %dx%d",
>>>> + vsen->mbus_format.width,
>>>> + vsen->mbus_format.height);
>>>> + tpg_gen_text(&vsen->tpg, basep, line++ * line_height,
>>>> + 16, str);
>>>> + }
>>>> + case OSD_SHOW_COUNTERS:
>>>
>>> Checkpatch gives this error:
>>>
>>> WARNING: Possible switch case/default not preceded by break or fallthrough comment
>>>
>>> You need to add a fallthrough comment (grep for fallthrough to find other examples)
>>
>> Okay, I will add that
>>
>>>
>>>> + {
>>>> + unsigned int ms;
>>>> +
>>>> + ms = (ktime_get_ns() - vsen->start_stream_ts) / 1000000;
>>>> + snprintf(str, sizeof(str), "%02d:%02d:%02d:%03d",
>>>> + (ms / (60 * 60 * 1000)) % 24,
>>>> + (ms / (60 * 1000)) % 60,
>>>> + (ms / 1000) % 60,
>>>> + ms % 1000);
>>>> + tpg_gen_text(&vsen->tpg, basep, line++ * line_height,
>>>> + 16, str);
>>>> + break;
>>>> + }
>>>> + case OSD_SHOW_NONE:
>>>
>>> No need this case statement if you have the default below.
>>
>> I added it to make it clearer what default does, should I remove it?
>
> hmm, I think this depends on your style, but to me, just the "default" statement below makes it
> clear that options not listed above do nothing.
> I think you would also need to add a fallthtough comment.

Consecutive case statements (or the default) statement should not need a
/* fallthrough */. I believe it's only if there is a code block it
becomes required.

--
Kieran


>
> Or you could just add a comment instead of the case statement in the code, like:
>
> /* case OSD_SHOW_NONE: */
>
> So it would be clear what this option does.
>
> Regards,
> Helen
>
>>
>>>
>>> Regards,
>>> Helen
>>>
>>>> + default:
>>>> + break;
>>>> + }
>>>> +
>>>> return vsen->frame;
>>>> }
>>>>
>>>> @@ -201,6 +249,8 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
>>>> const struct vimc_pix_map *vpix;
>>>> unsigned int frame_size;
>>>>
>>>> + vsen->start_stream_ts = ktime_get_ns();
>>>> +
>>>> /* Calculate the frame size */
>>>> vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
>>>> frame_size = vsen->mbus_format.width * vpix->bpp *
>>>> @@ -269,6 +319,9 @@ static int vimc_sen_s_ctrl(struct v4l2_ctrl *ctrl)
>>>> case V4L2_CID_SATURATION:
>>>> tpg_s_saturation(&vsen->tpg, ctrl->val);
>>>> break;
>>>> + case VIMC_CID_OSD_TEXT_MODE:
>>>> + vsen->osd_mode = ctrl->val;
>>>> + break;
>>>> default:
>>>> return -EINVAL;
>>>> }
>>>> @@ -307,6 +360,22 @@ static const struct v4l2_ctrl_config vimc_sen_ctrl_test_pattern = {
>>>> .qmenu = tpg_pattern_strings,
>>>> };
>>>>
>>>> +static const char * const vimc_ctrl_osd_mode_strings[] = {
>>>> + "All",
>>>> + "Counters Only",
>>>> + "None",
>>>> + NULL,
>>>> +};
>>>> +
>>>> +static const struct v4l2_ctrl_config vimc_sen_ctrl_osd_mode = {
>>>> + .ops = &vimc_sen_ctrl_ops,
>>>> + .id = VIMC_CID_OSD_TEXT_MODE,
>>>> + .name = "Show Information",
>>>> + .type = V4L2_CTRL_TYPE_MENU,
>>>> + .max = ARRAY_SIZE(vimc_ctrl_osd_mode_strings) - 2,
>>>> + .qmenu = vimc_ctrl_osd_mode_strings,
>>>> +};
>>>> +
>>>> static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
>>>> const char *vcfg_name)
>>>> {
>>>> @@ -323,6 +392,7 @@ static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
>>>>
>>>> v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_class, NULL);
>>>> v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_test_pattern, NULL);
>>>> + v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_osd_mode, NULL);
>>>> v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
>>>> V4L2_CID_VFLIP, 0, 1, 1, 0);
>>>> v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
>>>>

--
Regards
--
Kieran

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