From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:56172 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751703AbdAFWC4 (ORCPT ); Fri, 6 Jan 2017 17:02:56 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Boris Brezillon , Eric Anholt , Stephen Boyd Subject: [PATCH 4.4 08/58] clk: bcm2835: Avoid overwriting the div info when disabling a pll_div clk Date: Fri, 6 Jan 2017 22:43:53 +0100 Message-Id: <20170106213906.711999622@linuxfoundation.org> In-Reply-To: <20170106213906.290654840@linuxfoundation.org> References: <20170106213906.290654840@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Boris Brezillon commit 68af4fa8f39b542a6cde7ac19518d88e9b3099dc upstream. bcm2835_pll_divider_off() is resetting the divider field in the A2W reg to zero when disabling the clock. Make sure we preserve this value by reading the previous a2w_reg value first and ORing the result with A2W_PLL_CHANNEL_DISABLE. Signed-off-by: Boris Brezillon Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks") Reviewed-by: Eric Anholt Signed-off-by: Stephen Boyd Signed-off-by: Greg Kroah-Hartman --- drivers/clk/bcm/clk-bcm2835.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -1082,7 +1082,9 @@ static void bcm2835_pll_divider_off(stru cprman_write(cprman, data->cm_reg, (cprman_read(cprman, data->cm_reg) & ~data->load_mask) | data->hold_mask); - cprman_write(cprman, data->a2w_reg, A2W_PLL_CHANNEL_DISABLE); + cprman_write(cprman, data->a2w_reg, + cprman_read(cprman, data->a2w_reg) | + A2W_PLL_CHANNEL_DISABLE); spin_unlock(&cprman->regs_lock); }