[PATCH 1/5] drm/i915/dmc: handle request_firmware() errors separately

[Gustavo Sousa]

Quoting Jani Nikula (2024-04-18 16:56:06-03:00)
>On Thu, 18 Apr 2024, Gustavo Sousa <gustavo.sousa at intel.com> wrote:
>> Quoting Jani Nikula (2024-04-18 11:39:50-03:00)
>>>Clarify request_firmware() error handling. Don't proceed to trying to
>>>parse non-existent firmware or check for payload when request_firmware()
>>>failed to begin with. There's no reason to release_firmware() either
>>>when request_firmware() failed.
>>>
>>>Also move the message about DMC firmware homepage here, as in other
>>>cases the user probably has some firmware, although its parsing fails
>>>for some reason.
>>>
>>>Signed-off-by: Jani Nikula <jani.nikula at intel.com>
>>>---
>>> drivers/gpu/drm/i915/display/intel_dmc.c | 11 +++++++++--
>>> 1 file changed, 9 insertions(+), 2 deletions(-)
>>>
>>>diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
>>>index a34ff3383fd3..65880dea9c15 100644
>>>--- a/drivers/gpu/drm/i915/display/intel_dmc.c
>>>+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
>>>@@ -942,6 +942,15 @@ static void dmc_load_work_fn(struct work_struct *work)
>>>                 }
>>>         }
>>> 
>>>+        if (err) {
>>>+                drm_notice(&i915->drm,
>>>+                           "Failed to load DMC firmware %s (%pe). Disabling runtime power management.\n",
>>>+                           dmc->fw_path, ERR_PTR(err));
>>>+                drm_notice(&i915->drm, "DMC firmware homepage: %s",
>>>+                           INTEL_DMC_FIRMWARE_URL);
>>
>> This could also be:
>>
>>     drm_notice(&i915->drm, "DMC firmware homepage: " INTEL_DMC_FIRMWARE_URL)
>
>Although it currently doesn't, a URL could contain printf format
>characters.

Good point.

>
>>
>>>+                return;
>>>+        }
>>>+
>>>         parse_dmc_fw(dmc, fw);
>>
>> Maybe also remove the now unnecessary NULL check for fw in
>> parse_dmc_fw()?
>
>Yeah, was ambivalent about it, could go either way.
>
>>
>>> 
>>>         if (intel_dmc_has_payload(i915)) {
>>>@@ -956,8 +965,6 @@ static void dmc_load_work_fn(struct work_struct *work)
>>>                            "Failed to load DMC firmware %s."
>>
>> Should we tweak the message to differentiate from the previous one? At
>> this point, we know the blob file exists, but there is a problem with
>> its content.
>
>That's done in the next patch. :)

Yeah, realized that later on. :-)

--
Gustavo Sousa

>
>>
>> I think the patch looks good and to me all of the above suggestions are
>> just that :-)  So, with or without them:
>>
>> Reviewed-by: Gustavo Sousa <gustavo.sousa at intel.com>
>
>Thanks!
>
>BR,
>Jani.
>
>>
>> --
>> Gustavo Sousa
>>
>>>                            " Disabling runtime power management.\n",
>>>                            dmc->fw_path);
>>>-                drm_notice(&i915->drm, "DMC firmware homepage: %s",
>>>-                           INTEL_DMC_FIRMWARE_URL);
>>>         }
>>> 
>>>         release_firmware(fw);
>>>-- 
>>>2.39.2
>>>
>
>-- 
>Jani Nikula, Intel