qup_i2c: turn off the ahb clock conditionally.
Each GSBI has QUP-I2C and UART cores which can be
used independently. However, the AHB clock is
shared by these blocks. So we keep it on if the
cores are used independently from different processors.
CRs-Fixed: 387908
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
(cherry picked from commit 9aa5e91924934035fe0567f02f94a7cd5d0c963f)
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
(cherry picked from commit 3c11ab97102bd1e713e00ef7d4eae872269cf35e)
Change-Id: I18f139d90f51c773b65bf62ac219ed24c9fc09b9
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index c1617bf..085b632 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -328,12 +328,14 @@
dev->clk_state = state;
if (state != 0) {
clk_enable(dev->clk);
- clk_enable(dev->pclk);
+ if (!dev->pdata->keep_ahb_clk_on)
+ clk_enable(dev->pclk);
} else {
qup_update_state(dev, QUP_RESET_STATE);
clk_disable(dev->clk);
qup_config_core_on_en(dev);
- clk_disable(dev->pclk);
+ if (!dev->pdata->keep_ahb_clk_on)
+ clk_disable(dev->pclk);
}
}
@@ -1325,6 +1327,12 @@
dev->clk_state = 0;
clk_prepare(dev->clk);
clk_prepare(dev->pclk);
+ /* If the same AHB clock is used on Modem side
+ * switch it on here itself and don't switch it
+ * on and off during suspend and resume.
+ */
+ if (dev->pdata->keep_ahb_clk_on)
+ clk_enable(dev->pclk);
setup_timer(&dev->pwr_timer, qup_i2c_pwr_timer, (unsigned long) dev);
pm_runtime_set_active(&pdev->dev);
@@ -1396,9 +1404,11 @@
free_irq(dev->err_irq, dev);
i2c_del_adapter(&dev->adapter);
clk_unprepare(dev->clk);
- clk_unprepare(dev->pclk);
+ if (!dev->pdata->keep_ahb_clk_on) {
+ clk_unprepare(dev->pclk);
+ clk_put(dev->pclk);
+ }
clk_put(dev->clk);
- clk_put(dev->pclk);
qup_i2c_free_gpios(dev);
if (dev->gsbi)
iounmap(dev->gsbi);
@@ -1434,7 +1444,8 @@
if (dev->clk_state != 0)
qup_i2c_pwr_mgmt(dev, 0);
clk_unprepare(dev->clk);
- clk_unprepare(dev->pclk);
+ if (!dev->pdata->keep_ahb_clk_on)
+ clk_unprepare(dev->pclk);
qup_i2c_free_gpios(dev);
return 0;
}
@@ -1445,7 +1456,8 @@
struct qup_i2c_dev *dev = platform_get_drvdata(pdev);
BUG_ON(qup_i2c_request_gpios(dev) != 0);
clk_prepare(dev->clk);
- clk_prepare(dev->pclk);
+ if (!dev->pdata->keep_ahb_clk_on)
+ clk_prepare(dev->pclk);
dev->suspended = 0;
return 0;
}