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| author | Christian König <christian.koenig@amd.com> | 2013-01-21 13:58:46 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-01-31 22:24:47 +0100 |
| commit | 14adc89298f894816ea2f3aef4d8d2d6ede18575 (patch) | |
| tree | cef2d3b4a3e26fbe4b509491b446cd476be5a07d /drivers/gpu/drm/radeon/r600_blit_kms.c | |
| parent | radeon/kms: cleanup async dma packet checking (diff) | |
| download | linux-14adc89298f894816ea2f3aef4d8d2d6ede18575.tar.xz linux-14adc89298f894816ea2f3aef4d8d2d6ede18575.zip | |
drm/radeon: Deprecate UMS support v2
KMS support is out and stable for a couple of years now and
the userspace code has deprecated or abandoned the old UMS interface.
So make the KMS interface the default and deprecate the UMS interface
in the kernel as well.
v2: rebased on alex/drm-next-3.9-wip
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r600_blit_kms.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r600_blit_kms.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r600_blit_kms.c b/drivers/gpu/drm/radeon/r600_blit_kms.c index e082dca6feee..9fb5780a552f 100644 --- a/drivers/gpu/drm/radeon/r600_blit_kms.c +++ b/drivers/gpu/drm/radeon/r600_blit_kms.c @@ -31,6 +31,37 @@ #include "r600_blit_shaders.h" #include "radeon_blit_common.h" +/* 23 bits of float fractional data */ +#define I2F_FRAC_BITS 23 +#define I2F_MASK ((1 << I2F_FRAC_BITS) - 1) + +/* + * Converts unsigned integer into 32-bit IEEE floating point representation. + * Will be exact from 0 to 2^24. Above that, we round towards zero + * as the fractional bits will not fit in a float. (It would be better to + * round towards even as the fpu does, but that is slower.) + */ +__pure uint32_t int2float(uint32_t x) +{ + uint32_t msb, exponent, fraction; + + /* Zero is special */ + if (!x) return 0; + + /* Get location of the most significant bit */ + msb = __fls(x); + + /* + * Use a rotate instead of a shift because that works both leftwards + * and rightwards due to the mod(32) behaviour. This means we don't + * need to check to see if we are above 2^24 or not. + */ + fraction = ror32(x, (msb - I2F_FRAC_BITS) & 0x1f) & I2F_MASK; + exponent = (127 + msb) << I2F_FRAC_BITS; + + return fraction + exponent; +} + /* emits 21 on rv770+, 23 on r600 */ static void set_render_target(struct radeon_device *rdev, int format, |