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Message-ID: <20240328160057.124b32c4.pekka.paalanen@collabora.com>
Date: Thu, 28 Mar 2024 16:00:57 +0200
From: Pekka Paalanen <pekka.paalanen@...labora.com>
To: Louis Chauvet <louis.chauvet@...tlin.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, Melissa Wen
<melissa.srw@...il.com>, Maíra Canal
<mairacanal@...eup.net>, Haneen Mohammed <hamohammed.sa@...il.com>, Daniel
Vetter <daniel@...ll.ch>, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
arthurgrillo@...eup.net, Jonathan Corbet <corbet@....net>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com,
thomas.petazzoni@...tlin.com, seanpaul@...gle.com, marcheu@...gle.com,
nicolejadeyee@...gle.com
Subject: Re: [PATCH v5 16/16] drm/vkms: Add support for DRM_FORMAT_R*
On Wed, 13 Mar 2024 18:45:10 +0100
Louis Chauvet <louis.chauvet@...tlin.com> wrote:
> This add the support for:
> - R1/R2/R4/R8
>
> R1 format was tested with [1] and [2].
>
> [1]: https://lore.kernel.org/r/20240313-new_rotation-v2-0-6230fd5cae59@bootlin.com
> [2]: https://lore.kernel.org/igt-dev/20240306-b4-kms_tests-v1-0-8fe451efd2ac@bootlin.com/
>
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
> drivers/gpu/drm/vkms/vkms_formats.c | 100 ++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/vkms/vkms_plane.c | 6 ++-
> 2 files changed, 105 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
> index 863fc91d6d48..cbb2ec09564a 100644
> --- a/drivers/gpu/drm/vkms/vkms_formats.c
> +++ b/drivers/gpu/drm/vkms/vkms_formats.c
> @@ -201,6 +201,11 @@ static struct pixel_argb_u16 argb_u16_from_RGB565(const u16 *pixel)
> return out_pixel;
> }
>
> +static struct pixel_argb_u16 argb_u16_from_gray8(u8 gray)
> +{
> + return argb_u16_from_u8888(255, gray, gray, gray);
> +}
> +
> VISIBLE_IF_KUNIT struct pixel_argb_u16 argb_u16_from_yuv888(u8 y, u8 cb, u8 cr,
> struct conversion_matrix *matrix)
> {
> @@ -269,6 +274,89 @@ static void black_to_argb_u16(const struct vkms_plane_state *plane, int x_start,
> }
> }
>
> +static void Rx_read_line(const struct vkms_plane_state *plane, int x_start,
> + int y_start, enum pixel_read_direction direction, int count,
> + struct pixel_argb_u16 out_pixel[], u8 bit_per_pixel, u8 lum_per_level)
> +{
> + struct pixel_argb_u16 *end = out_pixel + count;
> + u8 *src_pixels;
> + int rem_x, rem_y;
> +
> + packed_pixels_addr(plane->frame_info, x_start, y_start, 0, &src_pixels, &rem_x, &rem_y);
Maybe assert that rem_y = 0? Or block_h = 1.
> + int bit_offset = (int)rem_x * bit_per_pixel;
Why cast rem_x to int when it was defined to be int?
> + int step = get_step_next_block(plane->frame_info->fb, direction, 0);
> + int mask = (0x1 << bit_per_pixel) - 1;
Since mask will interact with u8, it should be unsigned too.
> +
> + if (direction == READ_LEFT_TO_RIGHT || direction == READ_RIGHT_TO_LEFT) {
> + int restart_bit_offset = 0;
> + int step_bit_offset = bit_per_pixel;
> +
> + if (direction == READ_RIGHT_TO_LEFT) {
> + restart_bit_offset = 8 - bit_per_pixel;
> + step_bit_offset = -bit_per_pixel;
> + }
> +
> + while (out_pixel < end) {
> + u8 val = (*src_pixels & (mask << bit_offset)) >> bit_offset;
or shorter: (*src_pixels >> bit_offset) & mask
However, shouldn't the first pixel be on the high bits?
That how I would understand the comments in drm_fourcc.h.
Again a reason to avoid a solid color fill in IGT.
> +
> + *out_pixel = argb_u16_from_gray8(val * lum_per_level);
> +
> + bit_offset += step_bit_offset;
> + if (bit_offset < 0 || 8 <= bit_offset) {
> + bit_offset = restart_bit_offset;
> + src_pixels += step;
> + }
> + out_pixel += 1;
> + }
> + } else if (direction == READ_TOP_TO_BOTTOM || direction == READ_BOTTOM_TO_TOP) {
> + while (out_pixel < end) {
> + u8 val = (*src_pixels & (mask << bit_offset)) >> bit_offset;
> + *out_pixel = argb_u16_from_gray8(val * lum_per_level);
> + src_pixels += step;
> + out_pixel += 1;
> + }
> + }
> +}
> +
> +static void R1_read_line(const struct vkms_plane_state *plane, int x_start,
> + int y_start, enum pixel_read_direction direction, int count,
> + struct pixel_argb_u16 out_pixel[])
> +{
> + Rx_read_line(plane, x_start, y_start, direction, count, out_pixel, 1, 0xFF);
> +}
> +
> +static void R2_read_line(const struct vkms_plane_state *plane, int x_start,
> + int y_start, enum pixel_read_direction direction, int count,
> + struct pixel_argb_u16 out_pixel[])
> +{
> + Rx_read_line(plane, x_start, y_start, direction, count, out_pixel, 2, 0x55);
> +}
> +
> +static void R4_read_line(const struct vkms_plane_state *plane, int x_start,
> + int y_start, enum pixel_read_direction direction, int count,
> + struct pixel_argb_u16 out_pixel[])
> +{
> + Rx_read_line(plane, x_start, y_start, direction, count, out_pixel, 4, 0x11);
> +}
> +
> +static void R8_read_line(const struct vkms_plane_state *plane, int x_start,
> + int y_start, enum pixel_read_direction direction, int count,
> + struct pixel_argb_u16 out_pixel[])
> +{
> + struct pixel_argb_u16 *end = out_pixel + count;
> + u8 *src_pixels;
> + int rem_x, rem_y;
> + int step = get_step_next_block(plane->frame_info->fb, direction, 0);
> +
> + packed_pixels_addr(plane->frame_info, x_start, y_start, 0, &src_pixels, &rem_x, &rem_y);
Assert on block size?
> +
> + while (out_pixel < end) {
> + *out_pixel = argb_u16_from_gray8(*src_pixels);
> + src_pixels += step;
> + out_pixel += 1;
> + }
> +}
> +
> static void ARGB8888_read_line(const struct vkms_plane_state *plane, int x_start, int y_start,
> enum pixel_read_direction direction, int count,
> struct pixel_argb_u16 out_pixel[])
> @@ -582,6 +670,14 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
> case DRM_FORMAT_YVU422:
> case DRM_FORMAT_YVU444:
> return &planar_yuv_read_line;
> + case DRM_FORMAT_R1:
> + return &R1_read_line;
> + case DRM_FORMAT_R2:
> + return &R2_read_line;
> + case DRM_FORMAT_R4:
> + return &R4_read_line;
> + case DRM_FORMAT_R8:
> + return &R8_read_line;
> default:
> /*
> * This is a bug in vkms_plane_atomic_check. All the supported
> @@ -855,6 +951,10 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
> case DRM_FORMAT_ARGB16161616:
> case DRM_FORMAT_XRGB16161616:
> case DRM_FORMAT_RGB565:
> + case DRM_FORMAT_R1:
> + case DRM_FORMAT_R2:
> + case DRM_FORMAT_R4:
> + case DRM_FORMAT_R8:
> /*
> * Those formats are supported, but they don't need a conversion matrix. Return
It is strange that you need to list irrelevant formats here.
> * a valid pointer to avoid kernel panic in case this matrix is used/checked
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index e21cc92cf497..dc9d62acf350 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -29,7 +29,11 @@ static const u32 vkms_formats[] = {
> DRM_FORMAT_YUV444,
> DRM_FORMAT_YVU420,
> DRM_FORMAT_YVU422,
> - DRM_FORMAT_YVU444
> + DRM_FORMAT_YVU444,
> + DRM_FORMAT_R1,
> + DRM_FORMAT_R2,
> + DRM_FORMAT_R4,
> + DRM_FORMAT_R8
> };
>
> static struct drm_plane_state *
>
Thanks,
pq
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