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beagleboard / kernel

Kernel for the beagleboard.org boards
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McASP: writing to read-only bits. #86

Closed corrosion closed 10 years ago

corrosion commented 10 years ago

In kernel v3.12, file sound/soc/davinci/davinci-mcasp.c, function mcasp_start_tx()

if((pdir & ACLKR) && (rclk_reg & ACLKRE)) {
    mcasp_set_ctl_reg(dev->base + DAVINCI_MCASP_GBLCTLX_REG, RXCLKRST);
}

if((pdir & AHCLKR) && (rhclk_reg & AHCLKRE)) {
    mcasp_set_ctl_reg(dev->base + DAVINCI_MCASP_GBLCTLX_REG, RXHCLKRST);
}

Code is trying to set read-only bits in the DAVINCI_MCASP_GBLCTLX_REG register.

Issue is introduced from following commit: From e72407f930323a86d15cc4fd514b4f3b4acbcc8e Mon Sep 17 00:00:00 2001 From: Cody Lacey clacey@ti.com Date: Fri, 18 Oct 2013 12:42:00 -0500 Subject: [PATCH 14/15] ASoc: McASP: Lift Reset on CLK Dividers when RX/TX

clacey09 commented 10 years ago

Thanks, the fix has been pushed to branch 3.8 and 3.12.