6.14-stable review patch. If anyone has any objections, please let me know.
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From: Samson Tam Samson.Tam@amd.com
[ Upstream commit 0d3004647631aedb713251525a99784661574767 ]
[Why] IDENTITY_RATIO check uses 2 bits for integer, which only allows checking downscale ratios up to 3. But we support up to 6x downscale
[How] Update IDENTITY_RATIO to check 3 bits for integer Add ASSERT to catch if we downscale more than 6x
Signed-off-by: Samson Tam Samson.Tam@amd.com Reviewed-by: Jun Lei jun.lei@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/spl/dc_spl.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/spl/dc_spl.c b/drivers/gpu/drm/amd/display/dc/spl/dc_spl.c index 38a9a0d680581..18b423bd302a7 100644 --- a/drivers/gpu/drm/amd/display/dc/spl/dc_spl.c +++ b/drivers/gpu/drm/amd/display/dc/spl/dc_spl.c @@ -8,7 +8,7 @@ #include "dc_spl_isharp_filters.h" #include "spl_debug.h"
-#define IDENTITY_RATIO(ratio) (spl_fixpt_u2d19(ratio) == (1 << 19)) +#define IDENTITY_RATIO(ratio) (spl_fixpt_u3d19(ratio) == (1 << 19)) #define MIN_VIEWPORT_SIZE 12
static bool spl_is_yuv420(enum spl_pixel_format format) @@ -887,6 +887,8 @@ static bool spl_get_isharp_en(struct spl_in *spl_in, static void spl_get_taps_non_adaptive_scaler( struct spl_scratch *spl_scratch, const struct spl_taps *in_taps) { + bool check_max_downscale = false; + if (in_taps->h_taps == 0) { if (spl_fixpt_ceil(spl_scratch->scl_data.ratios.horz) > 1) spl_scratch->scl_data.taps.h_taps = spl_min(2 * spl_fixpt_ceil( @@ -926,6 +928,23 @@ static void spl_get_taps_non_adaptive_scaler( else spl_scratch->scl_data.taps.h_taps_c = in_taps->h_taps_c;
+ + /* + * Max downscale supported is 6.0x. Add ASSERT to catch if go beyond that + */ + check_max_downscale = spl_fixpt_le(spl_scratch->scl_data.ratios.horz, + spl_fixpt_from_fraction(6, 1)); + SPL_ASSERT(check_max_downscale); + check_max_downscale = spl_fixpt_le(spl_scratch->scl_data.ratios.vert, + spl_fixpt_from_fraction(6, 1)); + SPL_ASSERT(check_max_downscale); + check_max_downscale = spl_fixpt_le(spl_scratch->scl_data.ratios.horz_c, + spl_fixpt_from_fraction(6, 1)); + SPL_ASSERT(check_max_downscale); + check_max_downscale = spl_fixpt_le(spl_scratch->scl_data.ratios.vert_c, + spl_fixpt_from_fraction(6, 1)); + SPL_ASSERT(check_max_downscale); + if (IDENTITY_RATIO(spl_scratch->scl_data.ratios.horz)) spl_scratch->scl_data.taps.h_taps = 1; if (IDENTITY_RATIO(spl_scratch->scl_data.ratios.vert))