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@xxxxxxxxxxxxxx>
---
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);
