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arm-clk-bcm2835-hdmi-fixes.patch
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arm-clk-bcm2835-hdmi-fixes.patch
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From patchwork Thu Feb 8 13:43:37 2018
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [3/4] clk: bcm2835: De-assert/assert PLL reset signal when appropriate
From: Boris Brezillon <[email protected]>
X-Patchwork-Id: 10207157
Message-Id: <[email protected]>
To: Florian Fainelli <[email protected]>, Ray Jui <[email protected]>,
Scott Branden <[email protected]>,
Stephen Warren <[email protected]>,
Lee Jones <[email protected]>, Eric Anholt <[email protected]>,
Mike Turquette <[email protected]>,
Stephen Boyd <[email protected]>, [email protected]
Cc: Boris Brezillon <[email protected]>, [email protected]
Date: Thu, 8 Feb 2018 14:43:37 +0100
In order to enable a PLL, not only the PLL has to be powered up and
locked, but you also have to de-assert the reset signal. The last part
was missing. Add it so PLLs that were not enabled by the FW/bootloader
can be enabled from Linux.
Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks")
Cc: <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>
---
drivers/clk/bcm/clk-bcm2835.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index a07f6451694a..6c5d4a8e426c 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -602,6 +602,9 @@ static void bcm2835_pll_off(struct clk_hw *hw)
const struct bcm2835_pll_data *data = pll->data;
spin_lock(&cprman->regs_lock);
+ cprman_write(cprman, data->a2w_ctrl_reg,
+ cprman_read(cprman, data->a2w_ctrl_reg) &
+ ~A2W_PLL_CTRL_PRST_DISABLE);
cprman_write(cprman, data->cm_ctrl_reg,
cprman_read(cprman, data->cm_ctrl_reg) |
CM_PLL_ANARST);
@@ -640,6 +643,10 @@ static int bcm2835_pll_on(struct clk_hw *hw)
cpu_relax();
}
+ cprman_write(cprman, data->a2w_ctrl_reg,
+ cprman_read(cprman, data->a2w_ctrl_reg) |
+ A2W_PLL_CTRL_PRST_DISABLE);
+
return 0;
}