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drm/i915: Make the CHV CGM CSC register writes lockless

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The CHV CGM CSC registers are single buffered and so we
may have to write them from the vblank worker, which
imposes very tight dealines. Drop the pointless locking
for the register accessess to reduce the overhead.
All the other registers we bash from the vblank worker
(LUTs) were already made lockless earlier.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220202111616.1579-3-ville.syrjala@linux.intel.com
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
This commit is contained in:
Ville Syrjälä
2022-02-02 13:16:15 +02:00
parent 61b3b2da10
commit c94d13e9d9
1 changed files with 10 additions and 10 deletions
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20
drivers/gpu/drm/i915/display/intel_color.c
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@@ -396,16 +396,16 @@ static void chv_load_cgm_csc(struct intel_crtc *crtc,
coeffs[i] |= (abs_coeff >> 20) & 0xfff;
}
intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF01(pipe),
coeffs[1] << 16 | coeffs[0]);
intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF23(pipe),
coeffs[3] << 16 | coeffs[2]);
intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF45(pipe),
coeffs[5] << 16 | coeffs[4]);
intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF67(pipe),
coeffs[7] << 16 | coeffs[6]);
intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF8(pipe),
coeffs[8]);
intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF01(pipe),
coeffs[1] << 16 | coeffs[0]);
intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF23(pipe),
coeffs[3] << 16 | coeffs[2]);
intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF45(pipe),
coeffs[5] << 16 | coeffs[4]);
intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF67(pipe),
coeffs[7] << 16 | coeffs[6]);
intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF8(pipe),
coeffs[8]);
}
/* convert hw value with given bit_precision to lut property val */