linux-kernel - Re: [PATCH v7 [RESEND] 1/2] drivers: qcom: add command DB driver

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Date:   Thu, 12 Apr 2018 13:55:53 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, evgreen@...omium.org,
        dianders@...omium.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>
Subject: Re: [PATCH v7 [RESEND] 1/2] drivers: qcom: add command DB driver

Quoting Lina Iyer (2018-04-10 10:46:29)
> On Fri, Apr 06 2018 at 17:23 -0600, Stephen Boyd wrote:
> >Quoting Lina Iyer (2018-04-06 08:13:55)
> >> From: Mahesh Sivasubramanian <msivasub@...eaurora.org>
> >>
> >> Command DB is a simple database in the shared memory of QCOM SoCs, that
> >> provides information regarding shared resources. Some shared resources
> >> in the SoC have properties that are probed dynamically at boot by the
> >> remote processor. The information pertaining to the SoC and the platform
> >> are made available in the shared memory. Drivers can query this
> >> information using predefined strings.
> >>
> >> Signed-off-by: Mahesh Sivasubramanian <msivasub@...eaurora.org>
> >> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
> >> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> >> ---
> >
> >I have this patch on top to fix the endian stuff. Care to test it out
> >and see if it still works?
> >
> >From: Stephen Boyd <swboyd@...omium.org>
> >Subject: soc: qcom: cmd-db: Make endian-agnostic
> >
> >This driver deals with memory that is stored in little-endian format.
> >Update the structures with the proper little-endian types and then
> >do the proper conversions when reading the fields. Note that we compare
> >the ids with a memcmp() because we already pad out the string 'id' field
> >to exactly 8 bytes with the strncpy() onto the stack.
> >
> >Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> >
> >diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
> >index b5172049f608..a56dc9edab82 100644
> >--- a/drivers/soc/qcom/cmd-db.c
> >+++ b/drivers/soc/qcom/cmd-db.c
> >@@ -13,18 +13,10 @@
> >
> > #define NUM_PRIORITY          2
> > #define MAX_SLV_ID            8
> >-#define CMD_DB_MAGIC          0x0C0330DBUL
> >+static const char CMD_DB_MAGIC[] = { 0xdb, 0x33, 0x03, 0x0c };
> This has to be { 0xdb, 0x30, 0x03, 0x0c }
> 
> Otherwise it works.
> 

Perfect! Thanks for catching that. I will resend with the typo fix.