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[PATCHv2,11/12] staging: ti-soc-thermal: fix bitfield writing while updating thresholds

Message ID 1363704868-11843-12-git-send-email-eduardo.valentin@ti.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Eduardo Valentin March 19, 2013, 2:54 p.m. UTC 
Wrong threshold cold values may be written with current implementation.
This patch fixes the threshold update function by simplifying the
bitfield manipulation sequence.

Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
---
 drivers/staging/ti-soc-thermal/ti-bandgap.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/drivers/staging/ti-soc-thermal/ti-bandgap.c b/drivers/staging/ti-soc-thermal/ti-bandgap.c
index d075186..5c946cd 100644
--- a/drivers/staging/ti-soc-thermal/ti-bandgap.c
+++ b/drivers/staging/ti-soc-thermal/ti-bandgap.c
@@ -418,10 +418,10 @@  static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id,
 	}
 
 	/* write the new threshold values */
-	reg_val = thresh_val & ~tsr->threshold_thot_mask;
-	reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
-	reg_val |= thresh_val & ~tsr->threshold_tcold_mask;
-	reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
+	reg_val = thresh_val &
+		  ~(tsr->threshold_thot_mask | tsr->threshold_tcold_mask);
+	reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask)) |
+		   (t_cold << __ffs(tsr->threshold_tcold_mask));
 	ti_bandgap_writel(bgp, reg_val, tsr->bgap_threshold);
 
 	if (err) {