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From: <luo.penghao@zte.com.cn>
To: <ville.syrjala@linux.intel.com>
Cc: <cgel.zte@gmail.com>, <jani.nikula@linux.intel.com>,
	<joonas.lahtinen@linux.intel.com>, <rodrigo.vivi@intel.com>,
	<airlied@linux.ie>, <daniel@ffwll.ch>, <sfr@canb.auug.org.au>,
	<intel-gfx@lists.freedesktop.org>,
	<dri-devel@lists.freedesktop.org>, <zealci@zte.com.cn>
Subject: Re: [Intel-gfx]  [PATCH linux-next] drm/i915/display: Remove unused variable and its assignment.
Date: Tue, 19 Oct 2021 10:23:15 +0800 (CST)	[thread overview]
Message-ID: <202110191023155790666@zte.com.cn> (raw)


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> This one we could use. For some reason we hardcode it to



> 1 now, which is correct for our use cases but I don't really> see a reason to hardcode it here. We are supposed to calculate> it correctly after all, and chv_crtc_clock_get() also just blindly> reads it out.> > >      bestm2_frac = crtc_state->dpll.m2 & 0x3fffff;> > -    bestm1 = crtc_state->dpll.m1;> > This one is a bit trickier since I don't think the spec even> gives us other values. But we could assert that it's correct.> > Some something along these lines I think would be best:> + drm_WARN_ON(&dev_priv->drm, bestm1 != 2);>   vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW1(port),>                  DPIO_CHV_M1_DIV_BY_2 |> -          1 << DPIO_CHV_N_DIV_SHIFT);> +          bestn << DPIO_CHV_N_DIV_SHIFT);






Thanks for your kind response ! Does that means the variable will be


used by the hardware？if so as far as I see it, I don't seem to see the


relevant interface.

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WARNING: multiple messages have this Message-ID (diff)
From: <luo.penghao@zte.com.cn>
To: <ville.syrjala@linux.intel.com>
Cc: <cgel.zte@gmail.com>, <jani.nikula@linux.intel.com>,
	<joonas.lahtinen@linux.intel.com>, <rodrigo.vivi@intel.com>,
	<airlied@linux.ie>, <daniel@ffwll.ch>, <sfr@canb.auug.org.au>,
	<intel-gfx@lists.freedesktop.org>,
	<dri-devel@lists.freedesktop.org>, <zealci@zte.com.cn>
Subject: Re:[PATCH linux-next] drm/i915/display: Remove unused variable and its assignment.
Date: Tue, 19 Oct 2021 10:23:15 +0800 (CST)	[thread overview]
Message-ID: <202110191023155790666@zte.com.cn> (raw)


[-- Attachment #1.1.1: Type: text/plain, Size: 963 bytes --]

> This one we could use. For some reason we hardcode it to



> 1 now, which is correct for our use cases but I don't really> see a reason to hardcode it here. We are supposed to calculate> it correctly after all, and chv_crtc_clock_get() also just blindly> reads it out.> > >      bestm2_frac = crtc_state->dpll.m2 & 0x3fffff;> > -    bestm1 = crtc_state->dpll.m1;> > This one is a bit trickier since I don't think the spec even> gives us other values. But we could assert that it's correct.> > Some something along these lines I think would be best:> + drm_WARN_ON(&dev_priv->drm, bestm1 != 2);>   vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW1(port),>                  DPIO_CHV_M1_DIV_BY_2 |> -          1 << DPIO_CHV_N_DIV_SHIFT);> +          bestn << DPIO_CHV_N_DIV_SHIFT);






Thanks for your kind response ! Does that means the variable will be


used by the hardware？if so as far as I see it, I don't seem to see the


relevant interface.

[-- Attachment #1.1.2: Type: text/html , Size: 2820 bytes --]

             reply	other threads:[~2021-10-19 12:40 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-19  2:23 luo.penghao [this message]
2021-10-19  2:23 ` Re:[PATCH linux-next] drm/i915/display: Remove unused variable and its assignment luo.penghao
  -- strict thread matches above, loose matches on Subject: below --
2021-10-19  2:24 [Intel-gfx] [PATCH " luo.penghao
2021-10-18  8:43 luo penghao
2021-10-18  8:57 ` Ville Syrjälä
2021-10-19  2:22   ` luo.penghao

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