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SubjectRe: [PATCH V1 1/2] mmc: sdhci-msm: Add interconnect bandwidth scaling support
Hi Sibi,

Thanks for the review!!

On 2020-06-03 17:22, Sibi Sankar wrote:
> Hey Pradeep,
> Thanks for the patch.
>
> On 2020-06-03 14:39, Pradeep P V K wrote:
>> Interconnect bandwidth scaling support is now added as a
>> part of OPP [1]. So, make sure interconnect driver is ready
>> before handling interconnect scaling.
>>
>> This change is based on
>> [1] [Patch v8] Introduce OPP bandwidth bindings
>> (https://lkml.org/lkml/2020/5/12/493)
>>
>> [2] [Patch v3] mmc: sdhci-msm: Fix error handling
>> for dev_pm_opp_of_add_table()
>> (https://lkml.org/lkml/2020/5/5/491)
>>
>> Signed-off-by: Pradeep P V K <ppvk@codeaurora.org>
>> ---
>> drivers/mmc/host/sdhci-msm.c | 16 ++++++++++++++++
>> 1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci-msm.c
>> b/drivers/mmc/host/sdhci-msm.c
>> index b277dd7..bf95484 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -14,6 +14,7 @@
>> #include <linux/slab.h>
>> #include <linux/iopoll.h>
>> #include <linux/regulator/consumer.h>
>> +#include <linux/interconnect.h>
>>
>> #include "sdhci-pltfm.h"
>> #include "cqhci.h"
>> @@ -1999,6 +2000,7 @@ static int sdhci_msm_probe(struct
>> platform_device *pdev)
>> struct sdhci_pltfm_host *pltfm_host;
>> struct sdhci_msm_host *msm_host;
>> struct clk *clk;
>> + struct icc_path *sdhc_path;
>> int ret;
>> u16 host_version, core_minor;
>> u32 core_version, config;
>> @@ -2070,6 +2072,20 @@ static int sdhci_msm_probe(struct
>> platform_device *pdev)
>> }
>> msm_host->bulk_clks[0].clk = clk;
>>
>> + /* Make sure that ICC driver is ready for interconnect bandwdith
>> + * scaling before registering the device for OPP.
>> + */
>> + sdhc_path = of_icc_get(&pdev->dev, NULL);
>> + ret = PTR_ERR_OR_ZERO(sdhc_path);
>> + if (ret) {
>> + if (ret == -EPROBE_DEFER)
>> + dev_info(&pdev->dev, "defer icc path: %d\n", ret);
>> + else
>> + dev_err(&pdev->dev, "failed to get icc path:%d\n", ret);
>> + goto bus_clk_disable;
>> + }
>> + icc_put(sdhc_path);
>
> ret = dev_pm_opp_of_find_icc_paths(&pdev->dev, NULL);
>
> since there are multiple paths
> described in the bindings you
> should use ^^ instead and you
> can drop temporary path as well.
>
Ok. of_icc_get() used above is only to test if ICC driver is ready or
not. I'm not
really using the multiple paths here. Anyhow i will use
dev_pm_opp_of_find_icc_paths()
to get rid of some extra lines of code.

>> +
>> msm_host->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core");
>> if (IS_ERR(msm_host->opp_table)) {
>> ret = PTR_ERR(msm_host->opp_table);

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