linux-kernel - [PATCH V4 1/2] mmc: sdhci-msm: Add interconnect bandwidth scaling support

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Message-Id: <1591691846-7578-2-git-send-email-ppvk@codeaurora.org>
Date:   Tue,  9 Jun 2020 14:07:25 +0530
From:   Pradeep P V K <ppvk@...eaurora.org>
To:     bjorn.andersson@...aro.org, adrian.hunter@...el.com,
        robh+dt@...nel.org, ulf.hansson@...aro.org,
        vbadigan@...eaurora.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, mka@...omium.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mmc-owner@...r.kernel.org, rnayak@...eaurora.org,
        sibis@...eaurora.org, matthias@...omium.org,
        Pradeep P V K <ppvk@...eaurora.org>
Subject: [PATCH V4 1/2] mmc: sdhci-msm: Add interconnect bandwidth scaling support

Interconnect bandwidth scaling support is now added as a
part of OPP. So, make sure interconnect driver is ready
before handling interconnect scaling.

Signed-off-by: Pradeep P V K <ppvk@...eaurora.org>
Reviewed-by: Sibi Sankar <sibis@...eaurora.org>
---

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)

 drivers/mmc/host/sdhci-msm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index b277dd7..15c42b0 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"
@@ -2070,6 +2071,11 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	}
 	msm_host->bulk_clks[0].clk = clk;
 
+	 /* Check for optional interconnect paths */
+	ret = dev_pm_opp_of_find_icc_paths(&pdev->dev, NULL);
+	if (ret)
+		goto bus_clk_disable;
+
 	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);
-- 
1.9.1