From 79010636174c78209e20c4f44370b2b13312e08c Mon Sep 17 00:00:00 2001 From: Keerthy Date: Wed, 22 Apr 2015 18:21:41 +0530 Subject: thermal: ti-soc-thermal: dra7: Implement Workaround for Errata i814 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bandgap Temperature read Dtemp can be corrupted DESCRIPTION Read accesses to registers listed below can be corrupted due to incorrect resynchronization between clock domains. Read access to registers below can be corrupted : • CTRL_CORE_DTEMP_MPU/GPU/CORE/DSPEVE/IVA_n (n = 0 to 4) • CTRL_CORE_TEMP_SENSOR_MPU/GPU/CORE/DSPEVE/IVA_n WORKAROUND Multiple reads to CTRL_CORE_TEMP_SENSOR_MPU/GPU/CORE/DSPEVE/IVA[9:0]: BGAP_DTEMPMPU/GPU/CORE/DSPEVE/IVA is needed to discard false value and read right value: 1. Perform two successive reads to BGAP_DTEMP bit field. (a) If read1 returns Val1 and read2 returns Val1, then right value is Val1. (b) If read1 returns Val1, read 2 returns Val2, a third read is needed. 2. Perform third read (a) If read3 returns Val2 then right value is Val2. (b) If read3 returns Val3, then right value is Val3. The above in gist means if val1 and val2 are the same then we can go ahead with that value else we need a third read which will be right since synchronization will be complete by then. Signed-off-by: Keerthy Signed-off-by: Eduardo Valentin --- drivers/thermal/ti-soc-thermal/ti-bandgap.c | 37 ++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) (limited to 'drivers/thermal/ti-soc-thermal/ti-bandgap.c') diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c index 62a5d449c388..9747523858a1 100644 --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c @@ -118,6 +118,37 @@ exit: return ret; } +/** + * ti_errata814_bandgap_read_temp() - helper function to read dra7 sensor temperature + * @bgp: pointer to ti_bandgap structure + * @reg: desired register (offset) to be read + * + * Function to read dra7 bandgap sensor temperature. This is done separately + * so as to workaround the errata "Bandgap Temperature read Dtemp can be + * corrupted" - Errata ID: i814". + * Read accesses to registers listed below can be corrupted due to incorrect + * resynchronization between clock domains. + * Read access to registers below can be corrupted : + * CTRL_CORE_DTEMP_MPU/GPU/CORE/DSPEVE/IVA_n (n = 0 to 4) + * CTRL_CORE_TEMP_SENSOR_MPU/GPU/CORE/DSPEVE/IVA_n + * + * Return: the register value. + */ +static u32 ti_errata814_bandgap_read_temp(struct ti_bandgap *bgp, u32 reg) +{ + u32 val1, val2; + + val1 = ti_bandgap_readl(bgp, reg); + val2 = ti_bandgap_readl(bgp, reg); + + /* If both times we read the same value then that is right */ + if (val1 == val2) + return val1; + + /* if val1 and val2 are different read it third time */ + return ti_bandgap_readl(bgp, reg); +} + /** * ti_bandgap_read_temp() - helper function to read sensor temperature * @bgp: pointer to ti_bandgap structure @@ -148,7 +179,11 @@ static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id) } /* read temperature */ - temp = ti_bandgap_readl(bgp, reg); + if (TI_BANDGAP_HAS(bgp, ERRATA_814)) + temp = ti_errata814_bandgap_read_temp(bgp, reg); + else + temp = ti_bandgap_readl(bgp, reg); + temp &= tsr->bgap_dtemp_mask; if (TI_BANDGAP_HAS(bgp, FREEZE_BIT)) -- cgit