* [PATCH] drm/i915: make a handful of read-only arrays static const
@ 2022-02-22 12:03 Colin Ian King
2022-02-22 12:43 ` Jani Nikula
2022-02-22 18:52 ` [Intel-gfx] " Ville Syrjälä
0 siblings, 2 replies; 3+ messages in thread
From: Colin Ian King @ 2022-02-22 12:03 UTC (permalink / raw)
To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
David Airlie, Daniel Vetter, intel-gfx, dri-devel
Cc: kernel-janitors, linux-kernel
Don't populate the read-only arrays on the stack but instead make
them static const. Also makes the object code a little smaller.
Reformat the statements to clear up checkpatch warning.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
drivers/gpu/drm/i915/display/intel_vdsc.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 3faea903b9ae..d49f66237ec3 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -378,10 +378,18 @@ calculate_rc_params(struct rc_parameters *rc,
{
int bpc = vdsc_cfg->bits_per_component;
int bpp = vdsc_cfg->bits_per_pixel >> 4;
- int ofs_und6[] = { 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12 };
- int ofs_und8[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
- int ofs_und12[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
- int ofs_und15[] = { 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12 };
+ static const int ofs_und6[] = {
+ 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
+ };
+ static const int ofs_und8[] = {
+ 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
+ };
+ static const int ofs_und12[] = {
+ 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
+ };
+ static const int ofs_und15[] = {
+ 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
+ };
int qp_bpc_modifier = (bpc - 8) * 2;
u32 res, buf_i, bpp_i;
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/i915: make a handful of read-only arrays static const
2022-02-22 12:03 [PATCH] drm/i915: make a handful of read-only arrays static const Colin Ian King
@ 2022-02-22 12:43 ` Jani Nikula
2022-02-22 18:52 ` [Intel-gfx] " Ville Syrjälä
1 sibling, 0 replies; 3+ messages in thread
From: Jani Nikula @ 2022-02-22 12:43 UTC (permalink / raw)
To: Colin Ian King, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
David Airlie, Daniel Vetter, intel-gfx, dri-devel
Cc: Manasi Navare, Vandita Kulkarni, kernel-janitors, linux-kernel
On Tue, 22 Feb 2022, Colin Ian King <colin.i.king@gmail.com> wrote:
> Don't populate the read-only arrays on the stack but instead make
> them static const. Also makes the object code a little smaller.
> Reformat the statements to clear up checkpatch warning.
>
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
> ---
> drivers/gpu/drm/i915/display/intel_vdsc.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index 3faea903b9ae..d49f66237ec3 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -378,10 +378,18 @@ calculate_rc_params(struct rc_parameters *rc,
> {
> int bpc = vdsc_cfg->bits_per_component;
> int bpp = vdsc_cfg->bits_per_pixel >> 4;
> - int ofs_und6[] = { 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12 };
> - int ofs_und8[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
> - int ofs_und12[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
> - int ofs_und15[] = { 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12 };
> + static const int ofs_und6[] = {
> + 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
> + };
> + static const int ofs_und8[] = {
> + 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
> + };
> + static const int ofs_und12[] = {
> + 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
> + };
Hmm, I wonder why the same values are duplicated in ofs_und8 and
ofs_und12. Cc: Vandita, Manasi.
Regardless, the patch is sane.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> + static const int ofs_und15[] = {
> + 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
> + };
> int qp_bpc_modifier = (bpc - 8) * 2;
> u32 res, buf_i, bpp_i;
--
Jani Nikula, Intel Open Source Graphics Center
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Intel-gfx] [PATCH] drm/i915: make a handful of read-only arrays static const
2022-02-22 12:03 [PATCH] drm/i915: make a handful of read-only arrays static const Colin Ian King
2022-02-22 12:43 ` Jani Nikula
@ 2022-02-22 18:52 ` Ville Syrjälä
1 sibling, 0 replies; 3+ messages in thread
From: Ville Syrjälä @ 2022-02-22 18:52 UTC (permalink / raw)
To: Colin Ian King
Cc: Tvrtko Ursulin, David Airlie, intel-gfx, kernel-janitors,
linux-kernel, dri-devel, Rodrigo Vivi
On Tue, Feb 22, 2022 at 12:03:23PM +0000, Colin Ian King wrote:
> Don't populate the read-only arrays on the stack but instead make
> them static const. Also makes the object code a little smaller.
> Reformat the statements to clear up checkpatch warning.
>
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
> ---
> drivers/gpu/drm/i915/display/intel_vdsc.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index 3faea903b9ae..d49f66237ec3 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -378,10 +378,18 @@ calculate_rc_params(struct rc_parameters *rc,
> {
> int bpc = vdsc_cfg->bits_per_component;
> int bpp = vdsc_cfg->bits_per_pixel >> 4;
> - int ofs_und6[] = { 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12 };
> - int ofs_und8[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
> - int ofs_und12[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
> - int ofs_und15[] = { 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12 };
> + static const int ofs_und6[] = {
> + 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
> + };
> + static const int ofs_und8[] = {
> + 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
> + };
> + static const int ofs_und12[] = {
> + 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
> + };
> + static const int ofs_und15[] = {
> + 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
> + };
Please shrink to s8 while at it.
> int qp_bpc_modifier = (bpc - 8) * 2;
> u32 res, buf_i, bpp_i;
>
> --
> 2.34.1
--
Ville Syrjälä
Intel
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2022-02-22 18:52 ` [Intel-gfx] " Ville Syrjälä
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