Re: [PATCH] drm/i915/dmc: Step away from symbolic links

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 10 May 2016, Patrik Jakobsson <patrik.jakobsson@linux.intel.com> wrote:
> On Tue, May 10, 2016 at 03:52:02PM +0300, Mika Kuoppala wrote:
>> Patrik Jakobsson <patrik.jakobsson@linux.intel.com> writes:
>> 
>> > [ text/plain ]
>> > Load specific firmware versions for the DMC instead of using symbolic
>> > links. The currently recommended versions are: SKL 1.26, KBL 1.01 and
>> > BXT 1.07.
>> >
>> 
>> We should augment the commit message to answer the 'why' part.
>> 
>> Otherwise, looks good.
>
> Yes I agree. Where did this discussion take place? I don't believe I was
> part of it. Rodrigo told me we've reached consensus on the decision but
> that's all I know.

This captures most of it I think
http://mid.gmane.org/87fuu6i0zb.fsf@intel.com


BR,
Jani.


>
> -Patrik
>
>> 
>> -Mika
>> 
>> 
>> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
>> > Cc: Imre Deak <imre.deak@intel.com>
>> > Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
>> > Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
>> > ---
>> >  drivers/gpu/drm/i915/intel_csr.c | 29 ++++++++++++++---------------
>> >  1 file changed, 14 insertions(+), 15 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
>> > index 2b3b428..ea047cd 100644
>> > --- a/drivers/gpu/drm/i915/intel_csr.c
>> > +++ b/drivers/gpu/drm/i915/intel_csr.c
>> > @@ -41,15 +41,15 @@
>> >   * be moved to FW_FAILED.
>> >   */
>> >  
>> > -#define I915_CSR_KBL "i915/kbl_dmc_ver1.bin"
>> > +#define I915_CSR_KBL "i915/kbl_dmc_ver1_01.bin"
>> >  MODULE_FIRMWARE(I915_CSR_KBL);
>> >  #define KBL_CSR_VERSION_REQUIRED	CSR_VERSION(1, 1)
>> >  
>> > -#define I915_CSR_SKL "i915/skl_dmc_ver1.bin"
>> > +#define I915_CSR_SKL "i915/skl_dmc_ver1_26.bin"
>> >  MODULE_FIRMWARE(I915_CSR_SKL);
>> > -#define SKL_CSR_VERSION_REQUIRED	CSR_VERSION(1, 23)
>> > +#define SKL_CSR_VERSION_REQUIRED	CSR_VERSION(1, 26)
>> >  
>> > -#define I915_CSR_BXT "i915/bxt_dmc_ver1.bin"
>> > +#define I915_CSR_BXT "i915/bxt_dmc_ver1_07.bin"
>> >  MODULE_FIRMWARE(I915_CSR_BXT);
>> >  #define BXT_CSR_VERSION_REQUIRED	CSR_VERSION(1, 7)
>> >  
>> > @@ -286,7 +286,7 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
>> >  	uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
>> >  	uint32_t i;
>> >  	uint32_t *dmc_payload;
>> > -	uint32_t required_min_version;
>> > +	uint32_t required_version;
>> >  
>> >  	if (!fw)
>> >  		return NULL;
>> > @@ -303,24 +303,23 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
>> >  	csr->version = css_header->version;
>> >  
>> >  	if (IS_KABYLAKE(dev_priv)) {
>> > -		required_min_version = KBL_CSR_VERSION_REQUIRED;
>> > +		required_version = KBL_CSR_VERSION_REQUIRED;
>> >  	} else if (IS_SKYLAKE(dev_priv)) {
>> > -		required_min_version = SKL_CSR_VERSION_REQUIRED;
>> > +		required_version = SKL_CSR_VERSION_REQUIRED;
>> >  	} else if (IS_BROXTON(dev_priv)) {
>> > -		required_min_version = BXT_CSR_VERSION_REQUIRED;
>> > +		required_version = BXT_CSR_VERSION_REQUIRED;
>> >  	} else {
>> >  		MISSING_CASE(INTEL_REVID(dev_priv));
>> > -		required_min_version = 0;
>> > +		required_version = 0;
>> >  	}
>> >  
>> > -	if (csr->version < required_min_version) {
>> > -		DRM_INFO("Refusing to load old DMC firmware v%u.%u,"
>> > -			 " please upgrade to v%u.%u or later"
>> > -			   " [" FIRMWARE_URL "].\n",
>> > +	if (csr->version != required_version) {
>> > +		DRM_INFO("Refusing to load DMC firmware v%u.%u,"
>> > +			 " please use v%u.%u [" FIRMWARE_URL "].\n",
>> >  			 CSR_VERSION_MAJOR(csr->version),
>> >  			 CSR_VERSION_MINOR(csr->version),
>> > -			 CSR_VERSION_MAJOR(required_min_version),
>> > -			 CSR_VERSION_MINOR(required_min_version));
>> > +			 CSR_VERSION_MAJOR(required_version),
>> > +			 CSR_VERSION_MINOR(required_version));
>> >  		return NULL;
>> >  	}
>> >  
>> > -- 
>> > 2.5.0

-- 
Jani Nikula, Intel Open Source Technology Center
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