Re: [Freedreno] [PATCH RFC 2/5] drm/msm: Add MSM-specific DSC helper methods
On 3/29/2023 5:40 PM, Dmitry Baryshkov wrote: On 30/03/2023 02:18, Jessica Zhang wrote: Introduce MSM-specific DSC helper methods, as some calculations are common between DP and DSC. Signed-off-by: Jessica Zhang --- drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/disp/msm_dsc_helper.c | 74 +++ drivers/gpu/drm/msm/disp/msm_dsc_helper.h | 28 3 files changed, 103 insertions(+) diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile index 7274c41228ed..897a5b1c88f6 100644 --- a/drivers/gpu/drm/msm/Makefile +++ b/drivers/gpu/drm/msm/Makefile @@ -90,6 +90,7 @@ msm-y += \ disp/mdp_kms.o \ disp/msm_disp_snapshot.o \ disp/msm_disp_snapshot_util.o \ + disp/msm_dsc_helper.o \ msm_atomic.o \ msm_atomic_tracepoints.o \ msm_debugfs.o \ diff --git a/drivers/gpu/drm/msm/disp/msm_dsc_helper.c b/drivers/gpu/drm/msm/disp/msm_dsc_helper.c new file mode 100644 index ..ec15c0d829e8 --- /dev/null +++ b/drivers/gpu/drm/msm/disp/msm_dsc_helper.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved + */ + +#include +#include +#include + +#include "msm_drv.h" +#include "msm_dsc_helper.h" + +static int get_comp_ratio(struct drm_dsc_config *dsc, u32 src_bpp) +{ + return mult_frac(100, src_bpp, DSC_BPP(*dsc)); +} + +static s64 get_bytes_per_soft_slice(struct drm_dsc_config *dsc, int intf_width, int comp_ratio) +{ + s64 comp_ratio_fp, num_bits_fp; + s64 numerator_fp, denominator_fp; + + comp_ratio_fp = drm_fixp_from_fraction(comp_ratio, 100); Please inline comp_ration calculation here. Don't use mult_frac(). + num_bits_fp = drm_fixp_from_fraction(8, 1); drm_int2fixp + + numerator_fp = drm_fixp_from_fraction(dsc->slice_width * dsc->bits_per_component * 3, 1); And here too. + denominator_fp = drm_fixp_mul(comp_ratio_fp, num_bits_fp); And num_bits_fp can be inlined too. denominator_fp = drm_fixp_from_fraction(src_bpp * 8, DSC_BPP) + + return drm_fixp_div(numerator_fp, denominator_fp); dsc->slice_width * bpc * 3 / (8 * src_bpp / DSC_BPP), thus: drm_fixp_from_fraction(dsc->slice_width * bpc * 3 * DSC_BPP, 8 * src_bpp) but I will not insist on this one. +} + +u32 msm_dsc_get_eol_byte_num(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp) +{ + u32 bytes_per_ss, extra_eol_bytes, bytes_per_intf; + s64 bytes_per_ss_fp; + int slice_per_intf = msm_dsc_get_slice_per_intf(dsc, intf_width); + int comp_ratio = get_comp_ratio(dsc, src_bpp); + + bytes_per_ss_fp = get_bytes_per_soft_slice(dsc, intf_width, comp_ratio); + bytes_per_ss = drm_fixp2int_ceil(bytes_per_ss_fp); s/_ss/_soft_slice/g + + bytes_per_intf = bytes_per_ss * slice_per_intf; + extra_eol_bytes = bytes_per_intf % 3; + if (extra_eol_bytes != 0) + extra_eol_bytes = 3 - extra_eol_bytes; + + return extra_eol_bytes; +} + +u32 msm_dsc_get_dce_bytes_per_line(struct drm_dsc_config *dsc, int intf_width) +{ + u32 bpp; + u32 dce_bytes_per_line; + + bpp = DSC_BPP(*dsc); Didn't this cause a warning on the unused-but-set variable? + dce_bytes_per_line = DIV_ROUND_UP(dsc->bits_per_pixel * intf_width, 8); + + return dce_bytes_per_line; +} If you have msm_dsc_get_slice_per_intf() as a static inline, this function can be a static inline too. Nothing more than a single DIV_ROUND_UP. + +int msm_dsc_get_pclk_per_line(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp) +{ + s64 data_width; + int comp_ratio = get_comp_ratio(dsc, src_bpp); + + if (!dsc->slice_width || (intf_width < dsc->slice_width)) + return -EINVAL; + + data_width = get_bytes_per_soft_slice(dsc, intf_width, comp_ratio); + data_width = drm_fixp_mul(dsc->slice_count, data_width); + data_width = drm_fixp_from_fraction(data_width, 3); Reusing a variable is a nice trick, but it can be confusing. Not to mention that the last call should probably be drm_fixp_div() Hi Dmitry, Acked (for all the comments here). Planning to move the last divide by 3 out of this method (as the value that uncompressed pclk is divided by depends on DSI/DP and if widebus is enabled), so I'll merge the get_bytes_per_soft_slice call with the 2nd line. Thanks, Jessica Zhang + + return drm_fixp2int_ceil(data_width); +} diff --git a/drivers/gpu/drm/msm/disp/msm_dsc_helper.h b/drivers/gpu/drm/msm/disp/msm_dsc_helper.h new file mode 100644 index ..308069b2b5a4 --- /dev/null +++ b/drivers/gpu/drm/msm/disp/msm_dsc_helper.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved + */ + +#ifndef MSM_DSC_HELPER_H_ +#define MSM_DSC_HELPER_H_ + +#include +#include + +/* + * Helper methods for MSM specific DSC calculations that are common between timing engine, + * DSI,
Re: [PATCH RFC 2/5] drm/msm: Add MSM-specific DSC helper methods
On 30/03/2023 02:18, Jessica Zhang wrote: Introduce MSM-specific DSC helper methods, as some calculations are common between DP and DSC. Signed-off-by: Jessica Zhang --- drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/disp/msm_dsc_helper.c | 74 +++ drivers/gpu/drm/msm/disp/msm_dsc_helper.h | 28 Also: outside of disp, please. 3 files changed, 103 insertions(+) -- With best wishes Dmitry
Re: [PATCH RFC 2/5] drm/msm: Add MSM-specific DSC helper methods
On 30/03/2023 02:18, Jessica Zhang wrote: Introduce MSM-specific DSC helper methods, as some calculations are common between DP and DSC. Signed-off-by: Jessica Zhang --- drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/disp/msm_dsc_helper.c | 74 +++ drivers/gpu/drm/msm/disp/msm_dsc_helper.h | 28 3 files changed, 103 insertions(+) diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile index 7274c41228ed..897a5b1c88f6 100644 --- a/drivers/gpu/drm/msm/Makefile +++ b/drivers/gpu/drm/msm/Makefile @@ -90,6 +90,7 @@ msm-y += \ disp/mdp_kms.o \ disp/msm_disp_snapshot.o \ disp/msm_disp_snapshot_util.o \ + disp/msm_dsc_helper.o \ msm_atomic.o \ msm_atomic_tracepoints.o \ msm_debugfs.o \ diff --git a/drivers/gpu/drm/msm/disp/msm_dsc_helper.c b/drivers/gpu/drm/msm/disp/msm_dsc_helper.c new file mode 100644 index ..ec15c0d829e8 --- /dev/null +++ b/drivers/gpu/drm/msm/disp/msm_dsc_helper.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved + */ + +#include +#include +#include + +#include "msm_drv.h" +#include "msm_dsc_helper.h" + +static int get_comp_ratio(struct drm_dsc_config *dsc, u32 src_bpp) +{ + return mult_frac(100, src_bpp, DSC_BPP(*dsc)); +} + +static s64 get_bytes_per_soft_slice(struct drm_dsc_config *dsc, int intf_width, int comp_ratio) +{ + s64 comp_ratio_fp, num_bits_fp; + s64 numerator_fp, denominator_fp; + + comp_ratio_fp = drm_fixp_from_fraction(comp_ratio, 100); Please inline comp_ration calculation here. Don't use mult_frac(). + num_bits_fp = drm_fixp_from_fraction(8, 1); drm_int2fixp + + numerator_fp = drm_fixp_from_fraction(dsc->slice_width * dsc->bits_per_component * 3, 1); And here too. + denominator_fp = drm_fixp_mul(comp_ratio_fp, num_bits_fp); And num_bits_fp can be inlined too. denominator_fp = drm_fixp_from_fraction(src_bpp * 8, DSC_BPP) + + return drm_fixp_div(numerator_fp, denominator_fp); dsc->slice_width * bpc * 3 / (8 * src_bpp / DSC_BPP), thus: drm_fixp_from_fraction(dsc->slice_width * bpc * 3 * DSC_BPP, 8 * src_bpp) but I will not insist on this one. +} + +u32 msm_dsc_get_eol_byte_num(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp) +{ + u32 bytes_per_ss, extra_eol_bytes, bytes_per_intf; + s64 bytes_per_ss_fp; + int slice_per_intf = msm_dsc_get_slice_per_intf(dsc, intf_width); + int comp_ratio = get_comp_ratio(dsc, src_bpp); + + bytes_per_ss_fp = get_bytes_per_soft_slice(dsc, intf_width, comp_ratio); + bytes_per_ss = drm_fixp2int_ceil(bytes_per_ss_fp); s/_ss/_soft_slice/g + + bytes_per_intf = bytes_per_ss * slice_per_intf; + extra_eol_bytes = bytes_per_intf % 3; + if (extra_eol_bytes != 0) + extra_eol_bytes = 3 - extra_eol_bytes; + + return extra_eol_bytes; +} + +u32 msm_dsc_get_dce_bytes_per_line(struct drm_dsc_config *dsc, int intf_width) +{ + u32 bpp; + u32 dce_bytes_per_line; + + bpp = DSC_BPP(*dsc); Didn't this cause a warning on the unused-but-set variable? + dce_bytes_per_line = DIV_ROUND_UP(dsc->bits_per_pixel * intf_width, 8); + + return dce_bytes_per_line; +} If you have msm_dsc_get_slice_per_intf() as a static inline, this function can be a static inline too. Nothing more than a single DIV_ROUND_UP. + +int msm_dsc_get_pclk_per_line(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp) +{ + s64 data_width; + int comp_ratio = get_comp_ratio(dsc, src_bpp); + + if (!dsc->slice_width || (intf_width < dsc->slice_width)) + return -EINVAL; + + data_width = get_bytes_per_soft_slice(dsc, intf_width, comp_ratio); + data_width = drm_fixp_mul(dsc->slice_count, data_width); + data_width = drm_fixp_from_fraction(data_width, 3); Reusing a variable is a nice trick, but it can be confusing. Not to mention that the last call should probably be drm_fixp_div() + + return drm_fixp2int_ceil(data_width); +} diff --git a/drivers/gpu/drm/msm/disp/msm_dsc_helper.h b/drivers/gpu/drm/msm/disp/msm_dsc_helper.h new file mode 100644 index ..308069b2b5a4 --- /dev/null +++ b/drivers/gpu/drm/msm/disp/msm_dsc_helper.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved + */ + +#ifndef MSM_DSC_HELPER_H_ +#define MSM_DSC_HELPER_H_ + +#include +#include + +/* + * Helper methods for MSM specific DSC calculations that are common between timing engine, + * DSI, and DP. + */ + +#define MSM_DSC_SLICE_PER_PKT 1 +#define DSC_BPP(config) ((config).bits_per_pixel >> 4) Oh. Please. If you have used (config)->bits_per_pixel here, you wouldn't have to use clumsy DSC_BPP(*dsc). It might make sense to add:
[PATCH RFC 2/5] drm/msm: Add MSM-specific DSC helper methods
Introduce MSM-specific DSC helper methods, as some calculations are common between DP and DSC. Signed-off-by: Jessica Zhang --- drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/disp/msm_dsc_helper.c | 74 +++ drivers/gpu/drm/msm/disp/msm_dsc_helper.h | 28 3 files changed, 103 insertions(+) diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile index 7274c41228ed..897a5b1c88f6 100644 --- a/drivers/gpu/drm/msm/Makefile +++ b/drivers/gpu/drm/msm/Makefile @@ -90,6 +90,7 @@ msm-y += \ disp/mdp_kms.o \ disp/msm_disp_snapshot.o \ disp/msm_disp_snapshot_util.o \ + disp/msm_dsc_helper.o \ msm_atomic.o \ msm_atomic_tracepoints.o \ msm_debugfs.o \ diff --git a/drivers/gpu/drm/msm/disp/msm_dsc_helper.c b/drivers/gpu/drm/msm/disp/msm_dsc_helper.c new file mode 100644 index ..ec15c0d829e8 --- /dev/null +++ b/drivers/gpu/drm/msm/disp/msm_dsc_helper.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved + */ + +#include +#include +#include + +#include "msm_drv.h" +#include "msm_dsc_helper.h" + +static int get_comp_ratio(struct drm_dsc_config *dsc, u32 src_bpp) +{ + return mult_frac(100, src_bpp, DSC_BPP(*dsc)); +} + +static s64 get_bytes_per_soft_slice(struct drm_dsc_config *dsc, int intf_width, int comp_ratio) +{ + s64 comp_ratio_fp, num_bits_fp; + s64 numerator_fp, denominator_fp; + + comp_ratio_fp = drm_fixp_from_fraction(comp_ratio, 100); + num_bits_fp = drm_fixp_from_fraction(8, 1); + + numerator_fp = drm_fixp_from_fraction(dsc->slice_width * dsc->bits_per_component * 3, 1); + denominator_fp = drm_fixp_mul(comp_ratio_fp, num_bits_fp); + + return drm_fixp_div(numerator_fp, denominator_fp); +} + +u32 msm_dsc_get_eol_byte_num(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp) +{ + u32 bytes_per_ss, extra_eol_bytes, bytes_per_intf; + s64 bytes_per_ss_fp; + int slice_per_intf = msm_dsc_get_slice_per_intf(dsc, intf_width); + int comp_ratio = get_comp_ratio(dsc, src_bpp); + + bytes_per_ss_fp = get_bytes_per_soft_slice(dsc, intf_width, comp_ratio); + bytes_per_ss = drm_fixp2int_ceil(bytes_per_ss_fp); + + bytes_per_intf = bytes_per_ss * slice_per_intf; + extra_eol_bytes = bytes_per_intf % 3; + if (extra_eol_bytes != 0) + extra_eol_bytes = 3 - extra_eol_bytes; + + return extra_eol_bytes; +} + +u32 msm_dsc_get_dce_bytes_per_line(struct drm_dsc_config *dsc, int intf_width) +{ + u32 bpp; + u32 dce_bytes_per_line; + + bpp = DSC_BPP(*dsc); + dce_bytes_per_line = DIV_ROUND_UP(dsc->bits_per_pixel * intf_width, 8); + + return dce_bytes_per_line; +} + +int msm_dsc_get_pclk_per_line(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp) +{ + s64 data_width; + int comp_ratio = get_comp_ratio(dsc, src_bpp); + + if (!dsc->slice_width || (intf_width < dsc->slice_width)) + return -EINVAL; + + data_width = get_bytes_per_soft_slice(dsc, intf_width, comp_ratio); + data_width = drm_fixp_mul(dsc->slice_count, data_width); + data_width = drm_fixp_from_fraction(data_width, 3); + + return drm_fixp2int_ceil(data_width); +} diff --git a/drivers/gpu/drm/msm/disp/msm_dsc_helper.h b/drivers/gpu/drm/msm/disp/msm_dsc_helper.h new file mode 100644 index ..308069b2b5a4 --- /dev/null +++ b/drivers/gpu/drm/msm/disp/msm_dsc_helper.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved + */ + +#ifndef MSM_DSC_HELPER_H_ +#define MSM_DSC_HELPER_H_ + +#include +#include + +/* + * Helper methods for MSM specific DSC calculations that are common between timing engine, + * DSI, and DP. + */ + +#define MSM_DSC_SLICE_PER_PKT 1 +#define DSC_BPP(config) ((config).bits_per_pixel >> 4) + +static inline int msm_dsc_get_slice_per_intf(struct drm_dsc_config *dsc, int intf_width) +{ + return DIV_ROUND_UP(intf_width, dsc->slice_width); +} + +u32 msm_dsc_get_eol_byte_num(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp); +u32 msm_dsc_get_dce_bytes_per_line(struct drm_dsc_config *dsc, int intf_width); +int msm_dsc_get_pclk_per_line(struct drm_dsc_config *dsc, int intf_width, u32 src_bpp); +#endif /* MSM_DSC_HELPER_H_ */ -- 2.39.2