thermal: qcom: tsens-v1: Add support for MSM8956 and MSM8976

Hello AngeloGioacchino Del Regno,

The patch 95ededc17e4e: "thermal: qcom: tsens-v1: Add support for MSM8956 and MSM8976" from Oct 5, 2019, leads to the following static checker warning:

	drivers/thermal/qcom/tsens-v1.c:253 calibrate_8976()
	warn: mask and shift to zero

drivers/thermal/qcom/tsens-v1.c
235 static int calibrate_8976(struct tsens_priv *priv) 236 {

   237          int base0 = 0, base1 = 0, i;
   238          u32 p1[11], p2[11];
   239          int mode = 0, tmp = 0;
   240          u32 *qfprom_cdata;
   241  
   242          qfprom_cdata = (u32 *)qfprom_read(priv->dev, "calib");
   243          if (IS_ERR(qfprom_cdata)) {
   244                  kfree(qfprom_cdata);
   245                  return PTR_ERR(qfprom_cdata);
   246          }
   247  
   248          mode = (qfprom_cdata[4] & MSM8976_CAL_SEL_MASK);
   249          dev_dbg(priv->dev, "calibration mode is %d\n", mode);
   250  
   251          switch (mode) {
   252          case TWO_PT_CALIB:
   253                  base1 = (qfprom_cdata[2] & MSM8976_BASE1_MASK) >> MSM8976_BASE1_SHIFT;
                                                   ^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^
                                                   0xff                >> 8

base1 is always going to be zero.

   254                  p2[0] = (qfprom_cdata[0] & MSM8976_S0_P2_MASK) >> MSM8976_S0_P2_SHIFT;
   255                  p2[1] = (qfprom_cdata[0] & MSM8976_S1_P2_MASK) >> MSM8976_S1_P2_SHIFT;
   256                  p2[2] = (qfprom_cdata[1] & MSM8976_S2_P2_MASK) >> MSM8976_S2_P2_SHIFT;
   257                  p2[3] = (qfprom_cdata[1] & MSM8976_S3_P2_MASK) >> MSM8976_S3_P2_SHIFT;
   258                  p2[4] = (qfprom_cdata[2] & MSM8976_S4_P2_MASK) >> MSM8976_S4_P2_SHIFT;
   259                  p2[5] = (qfprom_cdata[2] & MSM8976_S5_P2_MASK) >> MSM8976_S5_P2_SHIFT;
   260                  p2[6] = (qfprom_cdata[3] & MSM8976_S6_P2_MASK) >> MSM8976_S6_P2_SHIFT;
   261                  p2[7] = (qfprom_cdata[3] & MSM8976_S7_P2_MASK) >> MSM8976_S7_P2_SHIFT;
   262                  p2[8] = (qfprom_cdata[4] & MSM8976_S8_P2_MASK) >> MSM8976_S8_P2_SHIFT;
   263                  p2[9] = (qfprom_cdata[4] & MSM8976_S9_P2_MASK) >> MSM8976_S9_P2_SHIFT;
   264                  p2[10] = (qfprom_cdata[5] & MSM8976_S10_P2_MASK) >> MSM8976_S10_P2_SHIFT;

265
266 for (i = 0; i < priv->num_sensors; i++)
267 p2[i] = ((base1 + p2[i]) << 2);
268 /* Fall through */

regards,
dan carpenter