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Subject[PATCH V2 1/2] mmc: sdhci-msm: Add interconnect bandwidth scaling support
Date
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 | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index b277dd7..a13ff1b 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 +2071,18 @@ 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.
+ */
+ ret = dev_pm_opp_of_find_icc_paths(&pdev->dev, NULL);
+ 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;
+ }
+
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
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